WO2020052555A1 - 显示设备的亮度-灰阶曲线的调制方法及电子设备 - Google Patents

显示设备的亮度-灰阶曲线的调制方法及电子设备 Download PDF

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Publication number
WO2020052555A1
WO2020052555A1 PCT/CN2019/105161 CN2019105161W WO2020052555A1 WO 2020052555 A1 WO2020052555 A1 WO 2020052555A1 CN 2019105161 W CN2019105161 W CN 2019105161W WO 2020052555 A1 WO2020052555 A1 WO 2020052555A1
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Prior art keywords
display device
brightness
brightness value
gray level
curve
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English (en)
French (fr)
Inventor
肖向春
邸贺亮
贾旭光
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BOE Technology Group Co Ltd
BOE Intelligent loT Technology Co Ltd
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BOE Technology Group Co Ltd
BOE Intelligent loT Technology Co Ltd
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Priority to US17/273,789 priority Critical patent/US11244655B2/en
Priority to EP19858876.6A priority patent/EP3852096A4/en
Publication of WO2020052555A1 publication Critical patent/WO2020052555A1/zh
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/003—Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto
    • G09G5/005—Adapting incoming signals to the display format of the display terminal
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3607—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/003—Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/10—Intensity circuits
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/027—Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0242—Compensation of deficiencies in the appearance of colours
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0693—Calibration of display systems
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data

Definitions

  • the present disclosure relates to the field of display technology, and more particularly, the present disclosure relates to a modulation method of a brightness-grayscale curve of a display device and an electronic device.
  • the gamma curve is usually used to modulate the brightness of each gray level, so that the display panel can accurately display different brightness in the image when displaying the image as much as possible.
  • the present disclosure provides a method, an apparatus, and an electronic device for modulating a brightness-grayscale curve of a display device.
  • a method for modulating a brightness-grayscale curve of a display device including: according to a maximum brightness value of the display device, a minimum brightness value of the display device, and a maximum value of the grayscale of the display device. 2.
  • Gamma parameters related to the display environment to obtain the theoretical brightness value corresponding to each gray level of the display device; and modulate the brightness of the display device according to the theoretical brightness value corresponding to each gray level of the display device.
  • the intermediate factor is obtained according to the maximum brightness value of the display device, the minimum brightness value of the display device, the maximum value of the gray scale of the display device, and the gamma parameter related to the display environment; The maximum value and intermediate factor of the gray scale of the display device to obtain the theoretical brightness value corresponding to each gray scale of the display device.
  • a specific gamma curve is determined according to a maximum brightness value of the display device, a minimum brightness value of the display device, a maximum value of the gray scale of the display device, and a gamma parameter related to the display environment; according to the specific gamma curve To obtain the theoretical brightness value corresponding to each gray level of the display device, wherein the intermediate factor of the specific gamma curve is based on the maximum brightness value of the display device, the minimum brightness value of the display device, the maximum value of the gray scale of the display device, and The display environment is determined by the gamma parameters.
  • the intermediate factor is determined according to the following formula:
  • L object max is the maximum brightness value of the display device
  • L object min is the minimum brightness value of the display device
  • n max is the maximum value of the gray scale of the display device
  • ⁇ is a gamma parameter related to the display environment
  • n 0 is the middle factor.
  • the theoretical brightness value corresponding to each gray level of the display device is obtained according to the following formula:
  • L object max is the maximum brightness value of the display device
  • n max is the maximum value of the gray scale of the display device
  • n 0 is the intermediate factor
  • n is each gray scale of the display device
  • L object (n) is each gray of the display device.
  • the theoretical brightness value corresponding to the order, ⁇ is a gamma parameter related to the display environment.
  • the value of the gamma parameter ranges from 2.0 to 2.4.
  • the gamma parameter is determined based on the value of the environmental factor, including: when the value of the environmental factor belongs to the first environmental parameter range, the value of the gamma curve parameter belongs to the first gamma curve Parameter range; when the value of the environmental factor belongs to the second environmental parameter range, the value of the gamma curve parameter belongs to the second gamma curve parameter range; wherein the values in the first environmental parameter range are greater than the second environmental parameter range The values in the parameter range of the first gamma curve are smaller than the values in the parameter range of the second gamma curve.
  • a ratio of a theoretical luminance value corresponding to each gray level in the obtained display device to a luminance value corresponding to each gray level in the actually-modulated display device satisfies the first range, and / or the obtained display
  • the ratio of the theoretical brightness difference corresponding to each gray level in the device to the actually measured brightness difference corresponding to each gray level in the modulated display device satisfies the second range.
  • the first range includes 1-15% to 1 + 15%
  • the second range includes 1-30% to 1 + 30%.
  • the standard deviation of the theoretical brightness value corresponding to each gray level in the display device and the actually measured brightness value corresponding to each gray level in the modulated display device satisfies a third range, or The maximum deviation between the theoretical brightness value corresponding to each gray level in the display device and the actually measured brightness value corresponding to each gray level in the modulated display device satisfies a fourth range.
  • the factor of the pupil change of the human eye includes a value corresponding to a ratio of a diameter size of a human eye pupil at a current ambient brightness to a diameter size of a human eye pupil at a predefined ambient brightness.
  • a method for modulating a brightness-grayscale curve of a display device includes: determining a human-eye-perceived brightness-grayscale application standard curve; a factor based on changes in the pupil of the human eye, and an environmental factor And at least one of the factors related to the display device and the human eye perceived brightness-grayscale application standard curve to obtain the theoretical brightness value corresponding to each grayscale in the display device; according to the theoretical brightness value corresponding to each grayscale in the display device To modulate the brightness of the display device.
  • an electronic device in another aspect, according to an embodiment of the present disclosure, includes a display device, a memory, and a processor.
  • the processor is coupled to the display device separately from the memory.
  • the memory stores instructions. The instructions are executed by the processor to cause the processor to perform the operations of the foregoing methods.
  • a non-transitory computer-readable recording medium on which a program for performing the above method has been recorded.
  • the method, device and electronic device for modulating the luminance-grayscale curve of a display device by determining a human-eye-perceived luminance-grayscale application standard curve; factors based on human eye pupil changes, environmental factors, and display At least one of the device-related factors and the human eye's perceived brightness-grayscale application standard curve to obtain the theoretical brightness value corresponding to each grayscale in the display device; according to the theoretical brightness value corresponding to each grayscale in the display device, the display is The brightness of the device is modulated.
  • the above method solves the problems of ambiguity of low grayscale details caused by modulating the display device with an ideal gamma curve, backlighting of the picture, high grayscale saturation, and excessively smooth colors, and taking into account the environmental factors' perception of the human eye
  • ideal gamma curve modulation to modulate the display device will cause the visible gray levels in the dim link to no longer be distinguishable in bright environments, and a quantifiable standard is proposed to compensate for the display Vacancy in the field for standards.
  • FIG. 1a is a schematic diagram showing a first gamma curve according to an embodiment of the present disclosure
  • FIG. 1b is a schematic diagram illustrating a second gamma curve according to an embodiment of the present disclosure
  • FIG. 1c is a schematic diagram showing a measured human eye perceived brightness-grayscale absolute standard curve according to an embodiment of the present disclosure
  • FIG. 2 is a block diagram illustrating a structure of an electronic device according to an embodiment of the present disclosure
  • FIG. 3 is a flowchart illustrating a modulation method of a brightness-grayscale curve of a display device according to an embodiment of the present disclosure
  • FIG. 4 is a flowchart illustrating a specific implementation of a method for modulating a brightness-grayscale curve of a display device according to an embodiment of the present disclosure
  • FIG. 5 is a functional block diagram illustrating a modulation device of a brightness-grayscale curve of a display device according to an embodiment of the present disclosure
  • FIG. 6 is a graph showing a ratio of a luminance value corresponding to each gray level in a display device after modulation using a conventional gamma curve and a luminance value corresponding to each gray level in a display device after modulation that is actually measured;
  • FIG. 7 is a flowchart illustrating a modulation method of a brightness-grayscale curve of a display device according to an embodiment of the present disclosure
  • FIG. 8 shows a theoretical brightness value corresponding to each gray level in a display device obtained after modulation by a modulation method of a brightness-gray scale curve of a display device according to an embodiment of the present disclosure, and an actually measured display device after modulation A curve of the ratio of the brightness values corresponding to each gray level;
  • FIG. 9 is a diagram illustrating a brightness difference corresponding to each gray level in a display device obtained after modulation according to a modulation method of a brightness-gray level curve of a display device according to an embodiment of the present disclosure, and each gray level in a modulated display device actually measured Curve of ratio of brightness difference corresponding to order;
  • FIG. 10 is a functional block diagram illustrating a modulation device of a brightness-grayscale curve of a display device according to an embodiment of the present disclosure
  • FIG. 11 is a flowchart illustrating a modulation method of a brightness-grayscale curve of a display device according to an embodiment of the present disclosure
  • FIG. 12 is a functional block diagram illustrating a modulation device of a brightness-grayscale curve of a display device according to an embodiment of the present disclosure
  • FIG. 13 shows a measured environment diagram including electronic equipment
  • FIG. 14 shows a detailed flowchart of a modulation method of a brightness-grayscale curve of a display device according to an embodiment of the present disclosure.
  • the transmission of video information goes through three stages: 1.
  • a display device that receives an electrical signal converts the electrical signal into an optical signal for visual presentation.
  • the perception of the image by the human eye is affected by the environment, such as too high or too low ambient light, which will interfere with the human eye's ability to distinguish gray levels, resulting in different perception of the picture ; 2, whether the display device has the ability to fully display the picture to be expressed. This display ability is usually reflected in three aspects: minimum brightness, maximum brightness, and color gamut. The lowest brightness is often overlooked.
  • OETF photoelectric conversion function
  • EOTF electro-optical conversion function
  • FIG. 1 a is a schematic diagram illustrating an ideal gamma curve according to an embodiment of the present disclosure.
  • an ideal gamma curve when the gray level is 0, the corresponding brightness value is also 0. .
  • the corresponding brightness value is not 0.
  • the CRT tradition is still followed, and the display device is ignored when the gray level is 0, the corresponding brightness value is not 0.
  • using an ideal gamma curve to modulate a display device will cause problems such as low-level grayscale ambiguity, backlighting, high-level saturation, and excessively uneven colors. Therefore, we need a gamma curve as shown in FIG. 1b, which can satisfy that when the gray level is 0, the corresponding brightness value is not 0.
  • an absolute standard curve of perceived brightness-grayscale of the human eye in a state where the pupil size does not change in a typical comfortable environment is established.
  • the human eye perceives the brightness-the gray scale absolute standard curve is based on the physiological and physical measurements in a standard environment, so this standard is an absolute standard.
  • this standard is an absolute standard.
  • the perceived brightness of the human eye corresponding to each gray level is an absolute value.
  • This gray level is an absolute gray level, and the brightness corresponding to it is called absolute perceived brightness.
  • the establishment of this standard helps to ensure the objectivity, uniqueness of the standard, direct correlation with the human eye, and the minimum characteristics of displayed data.
  • the gray-level perception ability of human eyes is measured to obtain the absolute standard curve of brightness-gray levels perceived by human eyes.
  • the brightness of this curve is absolute brightness, covering the range of highest and lowest brightness that can be perceived under the pupil diameter, as shown in Figure 1c, the horizontal axis is the horizontal axis coordinate is the human eye perceived brightness Ln (nit), and the vertical axis Is the gray level n, and the expression of the curve is:
  • L n represents the perceived brightness of the human eye
  • n represents a gray scale
  • F () represents a function
  • the human eye perceives the brightness-grayscale curve application standard, which corresponds to the human eye perceived brightness-grayscale application standard curve.
  • This curve is based on the human eye perceived brightness-grayscale absolute standard curve, taking into account at least one of the following factors: Digital information transmission conditions, historical conditions of past standards, and general capabilities of display devices, such as curves determined by color depth and sharpness, are compatible.
  • interpolation methods can be used to make the human eye perceive the gray level of the brightness-gray absolute standard curve to be finer to meet
  • the requirements of digital information transmission form different human eye perception brightness-grayscale application standard curves.
  • the human eye perceives the brightness-gray scale standard curve with 8-bit color depth of 256 gray levels
  • the human eye perceives the brightness-gray scale standard curve with 1024 gray levels of 10-bit color depth.
  • L n represents the perceived brightness of the human eye
  • n represents the gray scale expressed by the 8-bit color depth data
  • 0 ⁇ n ⁇ 256
  • F 256 () represents a function
  • Equipment Brightness-Grayscale Curve Standard corresponds to the brightness-grayscale curve of display devices. This standard is based on the human eye pupils based on the human eye's perceived brightness-grayscale curve application standard intended for display devices. At least one of a changed factor, an environmental factor, and a factor related to the display device, obtains a brightness-grayscale curve of the display device, and displays the graph in a specified environment according to the brightness-grayscale curve of the display device, so that The output image information forms image information on the retina of the human eye as close as possible to the intention of propagation.
  • SEOTF Equipment Brightness-Grayscale Curve Standard
  • the display device is not required to exceed the accuracy requirement of the brightness difference of the human-perceived brightness-gray standard curve.
  • Relative brightness a brightness difference less than the accuracy required for brightness difference
  • the present disclosure uses the above-mentioned three levels of standards (corresponding to three curves) to improve the modulation process of the display device, as follows:
  • the present disclosure also improves the shooting, transmission, and display processes of image (or video) information, as follows:
  • the filming stage In this stage, a photographing device is used to capture an image, and the human eye perceives the brightness-grayscale application standard curve to determine each grayscale of the image.
  • the gray scale of each pixel of the image is transmitted to the display device digitally.
  • the display device receives each gray level of the image, and displays the image in its specified environment based on the brightness-gray level curve of the display device.
  • a human eye is formed on the retina.
  • Eye-perceived brightness-An image with a standard curve applied to grayscale; that is, as far as possible, a pixel that is intended to present a human-perceived brightness of L is digitally processed, transmitted, and displayed in a display device environment.
  • a visual experience where the human eye perceives brightness L is formed on the retina.
  • the L object (n) is a theoretical brightness value corresponding to each gray level of the display device. When the physical brightness curve and each gray level n are determined for each gray level, the value of the L object (n) is determined.
  • L object (n) and L object can be understood equivalently.
  • L measurement (n) refers to the actual measured brightness value corresponding to each gray level in the modulated display device. This brightness value is the measured physical brightness value. Due to some limitations of the display device itself, the size of the L object (n) and the size of the L test (n) may be inconsistent, but it is desirable that their values be kept as consistent as possible to make the modulation effect better.
  • L Sense (n) refers to the brightness in the unit of optical brightness as perceived by the human eye after the modulation of the display device is completed. Each gray level is determined when the human eye perceives the brightness-gray level using the standard curve and each gray level n. The value of L Sense (n) is determined.
  • L sense (n) and L sense can be understood equivalently. Due to the particularity of the human eye (the environment will affect it) and some limitations of the display device itself, the size of the L sense (n) and the size of the L object (n) may be inconsistent, but it is hoped that the modulation will make people in the current environment eye sensation perceived image brightness L (n) can be as consistent as possible with the object display luminance L (n) of the modulation device.
  • the physical brightness-grayscale of the display device is determined by using a standard curve of human-eye perception brightness-grayscale and combining at least one of the factors of human eye pupil changes, environmental factors, and factors related to the display device. curve.
  • the physical brightness-grayscale curve modulated according to this curve can form a reducible image on the retina after passing through the human eye refractive system.
  • the shape of the eye is a sphere with a diameter of about 23mm, and the pupil diameter can vary between 2 and 8mm.
  • Rod cells cannot sense color, but the photosensitivity is extremely high than 10,000 times that of cone cells. Cone cells can both light and color.
  • Cone-shaped cells and rod-shaped cells are connected to the optic nerve via bipolar meridians, and the optic nerve cells pass to the brain through the optic nerve fibers.
  • the photosensitivity process is roughly divided into four steps:
  • the first step is to form a light image on the retina through the lens.
  • the light-sensitive pigments in pyramidal cells and rod-shaped cells are rhodopsin and rhodopsin, respectively. They undergo chemical changes after exposure to light, and the chemical changes proceed in opposite directions.
  • the second step the above optical change causes a point on the retina to generate a potential that is proportional to the illumination, and changes the light image on the retina into a potential image;
  • the third step the potential of each point on the retina prompts each corresponding optic nerve to discharge, and the discharge current is an electric pulse with a constant amplitude and a frequency that changes with the magnitude of the retinal potential.
  • Step 4 The visual cortex usually receives 2 million frequency-coded electrical pulse signals. First, they are stored in the special surface of the cell corresponding to the retinal photosensitive cells, and then comprehensive image information processing is performed to make people see and see Scenery image.
  • the size of the pupil is different in the high-light environment and the low-light environment, and the brightness projected onto the retina after the human eye refractive system will be different.
  • the brightness of the image pixel perceived by the human eye and the diameter of the pupil The square is proportional. It may be assumed that the brightness perceived by the pupil of the human eye in the comfort zone is consistent with the physical brightness of the object. In the so-called comfortable environment, we define it as an ordinary living room environment.
  • g ( ⁇ , ⁇ 0 ) is called the brightness perception factor function
  • F 1 () represents the function
  • ⁇ 0 represents the diameter of the through hole of the human eye under comfort
  • ⁇ represents the diameter of the through hole of the human eye in a certain environment.
  • the brightness L sensation at a point of the image perceived by the human eye is also proportional to the pupil area, and the light intensity is approximately regarded as the L object .
  • the relationship between the L sensation and the L object can be :
  • the size of the pupil area can be represented by the formula ⁇ R ⁇ 2, where R is the radius of the pupil. It can be found that when the radius of the pupil of the human eye changes, the change in the incoming light flux is proportional to the square of the radius of the pupil. In order to simplify the calculation, and Can make:
  • the absolute standard curve of human-perceived brightness-grayscale can be divided into three parts.
  • the standard curve of human-perceived brightness-grayscale application is also divided into three parts (perceived brightness of human eye).
  • the gray level application standard curve uses interpolation to subdivide the gray level perceived by the human eye-the gray level of the gray standard absolute standard curve, so the basic shape of the curve will not change).
  • the sensing limit of the visual cell As the sensing limit of the visual cell is approached, the sensory ability of the cell is reduced, and the brightness difference needs to be large. This is especially important when adjusting the brightness curve.
  • an absolute standard curve of human eyes perceiving brightness-gray scale in a comfortable area is obtained. Then, according to the Weber-Fechnell coefficient (minimum threshold of contrast) of the human eye in different regions, an absolute standard curve of human perception of brightness in the comfortable region can be obtained.
  • the segmentation curve of the L sensation is described below as an example.
  • FIG. 1c shows a schematic diagram showing a measured absolute human eye-luminance absolute standard curve, wherein the horizontal axis is lg (L sense ) and the vertical axis is grayscale n. From Figure 1c, it can be seen that the change value ⁇ L sensed by the human eye perceives the following relationship approximately with the change value ⁇ n of the gray scale:
  • ⁇ n k * ( ⁇ L Sense / L Sense ) (7)
  • n k * In (L Sense ) + C (8)
  • Ln () represents the natural logarithm, that is, the logarithm with e as the base.
  • 1 / k is not constant, and Weber's law is applicable in the range of 1 to 1000 nits.
  • k is small, that is, 1 / k is larger, which is 2.6% or more.
  • k is large.
  • the edge is adjusted at the pupil (for example, when the brightness is very low or very high)
  • the adjustment ability of the pupil becomes weak
  • the perception of the brightness L by the human eye is mainly positively related to the brightness L of the display device, which can be represented by the following curve :
  • n max Lg (L matter max / L matter min ) / Lg (1 + C) (15)
  • L object (n) represents the brightness of the display device when the gray level is n
  • L object (n + 1) represents the brightness of the display device when the gray level is n + 1
  • Lg () represents the logarithm with a base of 10
  • L object max is the maximum brightness value of the display device
  • L object min is the minimum brightness value of the display device
  • n max is the maximum value of the gray scale of the display device. Therefore, the number of gray levels in the comfort zone should be at least greater than n max .
  • the lowest physical brightness that can be achieved by the display device should be used as the starting point of the lowest gray level of the standard curve, rather than 0 as the starting point of the standard curve;
  • n 0 represents an intermediate factor
  • L object min1 Y 3 (n 0 , 0, L object max , L object min , ⁇ , ⁇ 0 ) (23)
  • L object min2 Y 4 (n 0 , 0, L object max , L object min , ⁇ , ⁇ 0 ) (24)
  • L object min3 Y 5 (n 0 , 0, L object max , L object min , ⁇ , ⁇ 0 ) (25)
  • L object max1 Y 3 (n 0 , n max , L object max , L object min , ⁇ , ⁇ 0 ) (26)
  • L object max2 Y 4 (n 0 , n max , L object max , L object min , ⁇ , ⁇ 0 ) (27)
  • L object max3 Y 5 (n 0 , n max , L object max , L object min , ⁇ , ⁇ 0 ) (28)
  • L sense can be a power function curve, a logarithmic curve, a perceptual quantization curve, and the like, and Y 1 (), Y 2 (), Y 3 (), Y 4 (), and Y 5 () represent a gamma function.
  • the gamma curve (shown below) is a kind of power function curve, which can be used as the L sensation in the bright field. If you want to display a wider area, Weber's law no longer applies. Empirically, we consider 0 ⁇ 0.1nit and brightness areas greater than 1000nit as non-comfortable areas.
  • the Dolby curve (PQ curve) is a perceptual quantization curve, and it can also be used as an embodiment of the L sense .
  • FIG. 2 is a block diagram illustrating a structure of an electronic device according to an embodiment of the present disclosure.
  • the electronic device includes a memory 110, a processor 120, and a display device 130.
  • the memory 110 may be used to store software programs and modules, such as a method and device corresponding to a method and device for modulating a brightness-grayscale curve of a display device in the embodiment of the present disclosure.
  • the processor 120 runs the software program stored in the memory 110 And modules to perform various functional applications and data processing, that is, to implement a modulation method of the brightness-grayscale curve of the display device in the embodiment of the present disclosure.
  • the memory 110 may include a high-speed random access memory, and may further include a non-volatile memory, such as one or more magnetic storage devices, a flash memory, or other non-volatile solid-state memory.
  • the software programs and modules in the memory 110 may further include: an operating system 111 and a service module 112.
  • the operating system 111 may be, for example, LINUX, UNIX, WINDOWS, etc., which may include various software components and / or drivers for managing system tasks (such as memory management, storage device control, power management, etc.), and may interact with various These hardware or software components communicate with each other to provide an operating environment for other software components.
  • the service module 112 runs on the basis of the operating system 111, and listens to requests from the network through the network service of the operating system 111, and completes the corresponding data processing according to the request.
  • the display device 130 may be used to display an image, and the display device 130 may include a two-dimensional display, a three-dimensional display, and the like. Further, the two-dimensional display may include a CRT (Cathode Ray Tube) display and an LCD (Liquid Crystal Display) display, etc., of course, it is not limited thereto.
  • CRT Cathode Ray Tube
  • LCD Liquid Crystal Display
  • FIG. 2 is only schematic, and the electronic device may further include more or fewer components than those shown in FIG. 2, or have a different configuration from that shown in FIG. 2.
  • Each component shown in FIG. 2 may be implemented by hardware, software, or a combination thereof.
  • the theory corresponding to each gray scale of the display device is obtained according to the maximum brightness value of the display device, the minimum brightness value of the display device, the maximum value of the gray scale of the display device, and the gamma parameter related to the display environment.
  • Brightness value then, the brightness of the display device is modulated according to the theoretical brightness value corresponding to each gray level of the display device.
  • the maximum value of the gray scale of the display device reflects the ability of the display device to express the color depth capability, and the maximum brightness value and the minimum brightness value of the display device reflect the ability of the display device to output the maximum and minimum brightness.
  • FIG. 3 shows a flowchart of a method for modulating a brightness-grayscale curve of a display device according to an embodiment of the present disclosure.
  • this embodiment describes a human-perceived brightness-grayscale application in a comfortable environment.
  • the standard curve corresponding to L Sense (n)
  • the method includes:
  • Step S211 Obtain an intermediate factor according to the maximum brightness value of the display device, the minimum brightness value of the display device, the maximum value of the gray scale of the display device, and the gamma parameter related to the display environment.
  • the intermediate factor in step S211 may be calculated according to the following formula:
  • L object max is the maximum brightness value of the display device
  • L object min is the minimum brightness value of the display device
  • n max is the maximum value of the gray scale of the display device
  • ⁇ is a gamma parameter of the gamma curve related to the display environment.
  • n 0 is an intermediate factor.
  • the value of the L object max and the L object min can be obtained by measurement.
  • L object max can be measured with the maximum gray level input
  • L object min can be measured with the minimum gray level input.
  • the values of the L object max , L object min , and n max are determined.
  • the value range of n max may be, for example, 63, 125, 255, 511, 1023, and the like, of course, it is not limited thereto.
  • the value range of the gamma parameter may be 2.0 to 2.4.
  • the value of the gamma curve parameter may range from 2.18 to 2.4.
  • the values of the gamma curve parameters may be 1.8, 2.0, 2.1, 2.2, 2.3, 2.4, and so on.
  • the gamma parameter may be determined based on the value of the environmental factor.
  • the environmental factors may include: the brightness value of the environment and the like. For example, it can be determined whether the current environment is a bright (office) environment or a dim (dark room) environment according to environmental factors.
  • the range of the value of the gamma curve parameter may belong to the first gamma curve parameter range; when the value of the environmental factor belongs to the second environmental parameter range, the gamma The range of the value of the horse curve parameter may belong to the second gamma curve parameter range; wherein the value in the first environmental parameter range is larger than the value in the second environmental parameter range, and the value in the first gamma curve parameter range is smaller than the second Values within the parameters of the gamma curve.
  • the value of the environmental factor is the brightness value of the environment
  • the value of the gamma curve parameter when the brightness value of the environment belongs to the brightness value range corresponding to the bright (office) environment, the value of the gamma curve parameter may be 2.2, and when the brightness value of the environment belongs to When the range of brightness values corresponding to a dim (dark room) environment, the range of the value of the gamma curve parameter may be 2.4.
  • the current value is only an example, and other values may be used, for example, other values close to the current example value.
  • the gamma curve parameter when the value of the environmental factor is small (dim environment), the gamma curve parameter is larger, and when the value of the environmental factor is large (bright environment), the gamma curve parameter is small, and modulation is performed in this way. , So that the display device display is further optimized.
  • the factors related to the display device may include at least one of the size of the screen of the display device, the brightness of the display device, and the distance between the display device and the user.
  • the brightness of the display device may include the average use brightness, the maximum brightness, the minimum brightness, etc. of the display device, but is not limited thereto. It can be understood that, because the size of the screen of the display device and the distance between the display device and the human body may also affect the stereo angle of the display device in human eyes, factors related to the display device may also include: angle.
  • factors related to the human body may include: pupil size of the human eye, and the like.
  • the factors related to the human body are specific to the pupil size of the human eye, so that the gamma curve can be used to modulate the display device more accurately, which can alleviate the effects of different display brightness.
  • the brightness value of the environment can be obtained through a light sensor, or the factors related to the display device can be detected by a detection device or directly read from the display device.
  • the parameters such as the screen size of the display device, and the pupil size of the human eye can also be measured by an eye detection instrument, which is not limited to this.
  • the gamma parameter can be further modulated, thereby further optimizing the modulation result.
  • the method for modulating the brightness-grayscale curve of the display device shown in FIG. 3 further includes step S212, according to the maximum brightness value of the display device, the maximum value of the grayscale of the display device, the intermediate factor and each grayscale of the display device. To obtain the theoretical brightness value corresponding to each gray level of the display device.
  • step S212 may be calculated according to the following formula:
  • L object max is the maximum brightness value of the display device
  • n max is the maximum value of the gray level of the display device
  • n 0 is the intermediate factor
  • n is a certain gray level of the display device
  • L object (n) is a certain gray level of the display device.
  • the gray scale corresponds to the theoretical brightness value
  • ⁇ is a gamma parameter of the gamma curve that is related to the display environment.
  • the values of the L object max and the L object min can be obtained by measurement.
  • the value range of n max may be, for example, 63, 125, 255, 511, 1023, etc., that is, the value of n max may be the power of 2 minus 1, which is not limited to this.
  • the value of n max depends on the brightness difference between two adjacent gray levels to be kept smaller than or close to the smallest brightness difference that can be perceived by the human eye, and the value of n max should be as small as possible to reduce the transmission of image data. the amount.
  • the value of n max may be 255.
  • the value of n max may be 1023.
  • n 0 is obtained. Therefore, when each gray level n of the display device is determined, the theoretical brightness value L object (n) corresponding to each gray level of the corresponding display device can be obtained.
  • a quantifiable standard is proposed reasonably and executable, which makes up for the lack of quantifiable conversion control standards in the field of liquid crystal display.
  • the method for modulating the brightness-grayscale curve of the display device shown in FIG. 3 further includes step S213, in which the brightness of the display device is modulated according to the theoretical brightness value corresponding to each grayscale of the display device.
  • FIG. 4 illustrates a specific implementation of a method for modulating a brightness-grayscale curve of a display device.
  • step S311 an intermediate factor is obtained according to the following formula.
  • L object max is the maximum brightness value of the display device
  • L object min is the minimum brightness value of the display device
  • n max is the maximum value of the gray scale of the display device
  • ⁇ is a gamma parameter related to the display environment
  • n 0 is the middle factor.
  • Step S312 Obtain a theoretical brightness value corresponding to each gray level of the display device according to the following formula.
  • L object max is the maximum brightness value of the display device
  • n max is the maximum value of the gray scale of the display device
  • n 0 is the intermediate factor
  • n is each gray scale of the display device
  • L object (n) is each gray of the display device.
  • the theoretical brightness value corresponding to the order, ⁇ is a gamma parameter related to the display environment.
  • step S313 the brightness of the display device is modulated according to the theoretical brightness value corresponding to each gray level of the display device. For example, for each gray scale, the output brightness of the display device is adjusted to a theoretical brightness value corresponding to the gray scale, or to a brightness value that differs from the theoretical brightness value within a predetermined error range.
  • a liquid crystal display device such as an SDR liquid crystal display device
  • the minimum grayscale value of the display device corresponds to a brightness value of 0, according to the gamma curve of a CRT display, if its application scene is a general office environment (bright environment) )
  • the ambient illuminance is 200 lx
  • the lighting power density is 7 W / m2
  • the maximum brightness value of the display device is 250 nit
  • the selected gamma curve parameter ⁇ related to the display environment is 2.2
  • the intermediate factor n 0 is calculated according to the formula: 0 and:
  • L object (n) is a theoretical brightness value corresponding to each gray level of the display device
  • L object max is a maximum brightness value of the display device
  • n is each gray level of the display device.
  • a liquid crystal display device such as an SDR liquid crystal display device
  • the brightness value corresponding to the lowest grayscale value of the display device is not 0, but L is min
  • the gamma curve of the CRT display if its application scenario
  • the maximum brightness value of the display device is 250nit
  • the maximum gray level of the display device is 255.
  • the relevant gamma curve parameter ⁇ is 2.2, which is calculated according to the following formula:
  • L object (n) is the theoretical brightness value corresponding to each gray level of the display device
  • L object max is the maximum brightness value of the display device
  • n is each gray level of the display device
  • n 0 is the intermediate factor
  • L object min is The minimum brightness value of the display device
  • n max is the maximum value of the gray scale of the display device.
  • a liquid crystal display device such as an SDR liquid crystal display device
  • the brightness value corresponding to the lowest grayscale value of the display device is not 0, but L is min
  • the gamma curve of the CRT display if its application scenario
  • the maximum brightness of the display is 250nit
  • the ambient illuminance is 5lx
  • the maximum value of the grayscale of the display device is 255.
  • the selected gamma curve parameter ⁇ related to the display environment is 2.4, according to The following formula is used for calculation:
  • L object (n) is the theoretical brightness value corresponding to each gray level of the display device
  • L object max is the maximum brightness value of the display device
  • n is each gray level of the display device
  • n 0 is the intermediate factor
  • L object min is The minimum brightness value of the display device
  • n max is the maximum value of the gray scale of the display device.
  • the brightness value corresponding to the lowest grayscale value of the display device is not 0, but L is min , then according to the gamma curve of the CRT display, if its application scenario It is a general office environment (bright environment). For example, the ambient brightness is 55nit and the maximum brightness of the display is 250nit. It may be better to set the middle grayscale L 127 to 55nit for the most comfortable viewing display effect.
  • the selected gamma curve parameter related to the display environment is ⁇ and the value is about 2.18, and is calculated according to the following formula:
  • L object (n) is the theoretical brightness value corresponding to each gray level of the display device
  • L object max is the maximum brightness value of the display device
  • n is each gray level of the display device
  • n 0 is the intermediate factor
  • L object min is The minimum brightness value of the display device
  • n max is the maximum value of the gray scale of the display device. of course. It can also be calculated according to the absolute standard of brightness-grayscale perceived by the human eye.
  • a liquid crystal display device such as an LCD liquid crystal display device
  • the brightness value corresponding to the lowest grayscale value of the display device is not 0, but L is min
  • the gamma curve of the LCD display if its application scenario
  • For the cinema mode suppose the diameter of the pupil of the human eye in the comfortable environment brightness ⁇ 0 , and assume the diameter of the pupil of the eye in the cinema mode ⁇ , the effect of the pupil diameter on the perceived brightness of the human eye is set and displayed The value of the environment-dependent gamma curve parameter ⁇ is reflected. Since ⁇ is taken as 2.2 in a comfortable environment and the exponent value of the CRT photoelectric conversion function is 2.4, the value of ⁇ here can be 2.4, which is calculated according to the following formula:
  • L object (n) is the theoretical brightness value corresponding to each gray level of the display device
  • L object max is the maximum brightness value of the display device
  • n is each gray level of the display device
  • n 0 is the intermediate factor
  • L object min is The minimum brightness value of the display device
  • n max is the maximum value of the gray scale of the display device.
  • the method for modulating the brightness-grayscale curve of a display device provided by an embodiment of the present disclosure, according to the maximum brightness value of the display device, the minimum brightness value of the display device, the maximum value of the grayscale of the display device, and the gamma related to the display environment.
  • Parameter to obtain the intermediate factor and further obtain the theoretical brightness value corresponding to each gray level of the display device according to the maximum brightness value of the display device, the maximum value of the gray level of the display device, the intermediate factor, and each gray level of the display device, thereby solving
  • the modulation of the display device with the ideal gamma curve modulation will cause the visible gray levels in the dim link to be indistinguishable in the bright environment, and a quantifiable standard is proposed to make up for the display field. Vacancy in standards.
  • FIG. 5 is a functional block diagram illustrating a modulation device 400 of a brightness-grayscale curve of a display device according to an embodiment of the present disclosure.
  • the modulation device 400 When the human eye perceives the brightness-grayscale application standard curve (corresponding to L Sense (n)) in a comfortable environment is determined as a gamma curve, the modulation device 400 according to the embodiment of the present disclosure performs the modulation method of the embodiment of the present disclosure.
  • the modulation device 400 of the brightness-grayscale curve of the display device runs in an electronic terminal.
  • the modulation device 400 of the brightness-grayscale curve of the display device may include a first obtaining module 410, a second obtaining module 420, and a modulation module 430.
  • the first obtaining module 410 is configured to obtain an intermediate factor according to the maximum brightness value of the display device, the minimum brightness value of the display device, the maximum value of the gray scale of the display device, and the gamma parameter related to the display environment.
  • the first obtaining module 410 is specifically configured to obtain
  • L object max is the maximum brightness value of the display device
  • L object min is the minimum brightness value of the display device
  • n max is the maximum value of the gray scale of the display device
  • ⁇ is a gamma parameter related to the display environment
  • n 0 is the middle factor.
  • the value of the gamma parameter ranges from 2.0 to 2.4.
  • the gamma parameter is determined based on a value of an environmental factor.
  • determining the gamma parameter based on the value of the environmental factor includes: when the value of the environmental factor belongs to the first environmental parameter range, the value of the gamma curve parameter belongs to the first gamma curve parameter range; when When the value of the environmental factor belongs to the second environmental parameter range, the value of the gamma curve parameter belongs to the second gamma curve parameter range; wherein the values in the first environmental parameter range are greater than the values in the second environmental parameter range, the first The values in the parameter range of one gamma curve are smaller than the values in the parameter range of the second gamma curve.
  • the second obtaining module 420 is configured to obtain a theoretical brightness value corresponding to each gray scale of the display device according to a maximum brightness value of the display device, a maximum value of the gray scale of the display device, an intermediate factor, and each gray scale of the display device.
  • the second obtaining module 420 is specifically configured to obtain
  • L object max is the maximum brightness value of the display device
  • n max is the maximum value of the gray scale of the display device
  • n 0 is the intermediate factor
  • n is each gray scale of the display device
  • L object (n) is each gray of the display device.
  • the theoretical brightness value corresponding to the order, ⁇ is a gamma parameter related to the display environment.
  • the modulation module 430 is configured to modulate the brightness of the display device according to the theoretical brightness value corresponding to each gray level of the display device.
  • the modulation module is specifically configured to modulate the brightness of the display device according to a theoretical brightness value corresponding to each gray level of the display device and a factor of human eye pupil change.
  • the factor of the change in the pupil of the human eye includes a value corresponding to the ratio of the diameter of the pupil of the human eye under the current ambient brightness to the diameter of the pupil of the human eye under the predefined ambient brightness.
  • the modulation device of the brightness-grayscale curve of the display device provided by the embodiment of the present disclosure, according to the maximum brightness value of the display device, the minimum brightness value of the display device, the maximum value of the grayscale of the display device, and the gamma related to the display environment Parameter to obtain the intermediate factor, and further obtain the theoretical brightness value corresponding to each gray level of the display device according to the maximum brightness value of the display device, the maximum value of the gray level of the display device, the intermediate factor, and each gray level of the display device, thereby solving
  • the modulation of the display device with the ideal gamma curve modulation will cause the visible gray levels in the dim link to be indistinguishable in the bright environment, and a quantifiable standard is proposed to make up for the
  • Each of the above modules may be implemented by software code, and may also be implemented by hardware such as an integrated circuit chip.
  • FIG. 6 shows the brightness value corresponding to each gray level in an ideal display device after being modulated using a conventional gamma curve, and the brightness corresponding to each gray level in an actual display device after modulation.
  • the ratio of the values to the curve can be
  • gamma correction is usually performed. For example, you can use data transformation to replace those too low brightness with higher brightness values, which means that some lower physical gray levels are actually discarded; by recursion, the discarded gray levels are usually concentrated to high At the light gray level, the details of the highlighted parts of the picture will disappear. If the discarded grayscale is placed in a medium-luminance part, some intermediate grayscales are lost, and the color in the full color gamut test picture will appear as a step. Appears on the skin color, the partial color difference of the skin color disappears, just like the wax, the highlight part will become white.
  • FIG. 7 illustrates a flowchart of a method for modulating a brightness-grayscale curve of a display device according to an embodiment of the present disclosure.
  • a standard curve corresponding to L Sense (n)
  • the method includes:
  • Step S511 Obtain a theoretical brightness value corresponding to each gray level in the display device according to the specific gamma curve.
  • the specific gamma curve includes:
  • L object max is the maximum brightness value of the display device
  • L object min is the minimum brightness value of the display device
  • n max is the maximum value of the gray scale of the display device
  • n 0 is an intermediate factor
  • n is each gray scale of the display device.
  • the L object (n) is a theoretical brightness value corresponding to each gray level of the display device
  • ⁇ is a gamma parameter related to the display environment.
  • the value of the gamma parameter ranges from 2.0 to 2.4.
  • the gamma parameter is determined based on a value of an environmental factor.
  • determining the gamma parameter based on the value of the environmental factor includes: when the value of the environmental factor belongs to the first environmental parameter range, the value of the gamma curve parameter belongs to the first gamma curve parameter range; when the value of the environmental factor is When the value belongs to the second environmental parameter range, the value of the gamma curve parameter belongs to the second gamma curve parameter range; where the values in the first environmental parameter range are greater than the values in the second environmental parameter range, the first gamma The values within the curve parameter range are all smaller than the values within the second gamma curve parameter range.
  • step S512 the brightness of the display device is modulated according to the brightness value corresponding to each gray level in the display device.
  • the obtained theoretical brightness value corresponding to each gray level in the display device and each of the actually measured display devices are modulated.
  • the ratio of the brightness values corresponding to the gray scales satisfies the first range, and / or the ratio of the brightness difference corresponding to each gray scale in the obtained display device to the actually measured brightness difference corresponding to each gray scale in the modulated display device satisfies the first Two scopes.
  • the ratio between the theoretical brightness value corresponding to each gray level in the display device and the actually measured brightness value corresponding to each gray level in the modulated display device can be according to the formula: Calculate, of course, the calculation method is not limited to this.
  • the ratio of the obtained brightness difference corresponding to each gray level in the display device to the actually measured brightness difference corresponding to each gray level in the modulated display device Calculate, of course, the calculation method is not limited to this.
  • modulating the brightness of the display device according to the theoretical brightness value corresponding to each gray level of the display device includes: adjusting the brightness of the display device according to the theoretical brightness value corresponding to each gray level of the display device and a factor of human eye pupil change. The brightness is modulated.
  • the factor of the change in the pupil of the human eye includes a value corresponding to the ratio of the diameter of the pupil of the human eye under the current ambient brightness to the diameter of the pupil of the human eye under the predefined ambient brightness.
  • the first range may include 1-15% to 1 + 15%, of course, it is not limited thereto, and may be a smaller range, for example: 1-10% to 1 + 10%, 1- 8% to 1 + 8%, 1-6% to 1 + 6%, etc .; or, a larger range, for example: 1-15% to 1 + 15%, 1-18% to 1 + 18 %, 1-20% to 1 + 20%, and so on.
  • FIG. 8 shows a theoretical brightness value corresponding to each gray level in the display device obtained after being modulated by a modulation method of a brightness-gray level curve of a display device according to an embodiment of the present disclosure.
  • Curve of the ratio of the brightness values corresponding to each gray level in the modulated display device, where the horizontal axis is each gray level of the display device, and the vertical axis is the theoretical brightness value and actual measurement corresponding to each gray level in the display device obtained The ratio of the brightness values corresponding to each gray level in the modulated display device. It can be understood that the horizontal axis of 0 to 255 in FIG. 8 is a value range (not fully shown).
  • the range of the ratio of the theoretical brightness value corresponding to each gray level in the obtained display device to the actually measured brightness value corresponding to each gray level in the modulated display device may be 0.88 to 1.03.
  • the corresponding gray level in the obtained display device corresponds
  • the deviation between the theoretical brightness value of the actual brightness value corresponding to each gray scale in the modulated display device is smaller, that is, the theoretical brightness value corresponding to each gray scale in the display device obtained by calculation is closer to the actual measurement.
  • the obtained brightness value corresponding to each gray level in the modulated display device makes the modulation effect better.
  • the second range includes 1-30% to 1 + 30%, of course, it is not limited to this, and may be a smaller range, for example: 1-20% to 1 + 20%, 1-15 % To 1 + 15%, 1-15% to 1 + 15%, etc .; or, a larger range, such as: 1-26% to 1 + 26%, 1-28% to 1 + 28% , 1-30% to 1 + 30%, and more.
  • FIG. 9 shows a theoretical brightness difference corresponding to each gray level in a display device obtained after being modulated by a modulation method of a brightness-gray level curve of a display device according to an embodiment of the present disclosure.
  • a curve of the ratio of the brightness difference corresponding to each gray level in the modulated display device, where the horizontal axis is each gray level of the display device, and the vertical axis is the obtained brightness difference corresponding to each gray level in the display device and the actual measured The ratio of the brightness difference corresponding to each gray level in the modulated display device.
  • the horizontal axis of 0 to 255 in FIG. 8 is a value range (not fully shown).
  • the ratio of the obtained brightness difference corresponding to each gray level in the display device to the actually measured brightness difference corresponding to each gray level in the modulated display device may be 0.75 to 1.2.
  • the color fluctuation of the modulated display device is more Smaller, smoother colors.
  • the standard deviation of the theoretical brightness value corresponding to each gray level in the obtained display device and the actually measured brightness value corresponding to each gray level in the modulated display device satisfies the third range, or each gray level in the obtained display device
  • the maximum deviation between the theoretical brightness value corresponding to the level and the brightness value corresponding to each gray level in the modulated display device actually measured satisfies the fourth range.
  • the standard deviation of the theoretical luminance value corresponding to each gray level in the obtained display device and the actually measured luminance value corresponding to each gray level in the modulated display device can be calculated according to the following formula:
  • L object (n) is the theoretical brightness value corresponding to each gray level of the display device
  • n max is the maximum value of the gray level of the display device
  • n is each gray level of the display device
  • L measurement (n) is the actual measurement The brightness value corresponding to each gray level in the modulated display device.
  • the maximum deviation between the theoretical brightness value corresponding to each gray level in the display device and the actually measured brightness value corresponding to each gray level in the modulated display device can be calculated according to the following formula:
  • the method of calculating the maximum deviation between the theoretical brightness value corresponding to each gray level in the display device and the actually measured brightness value corresponding to each gray level in the modulated display device is not limited to this.
  • a ratio of a standard deviation of a theoretical luminance value corresponding to each gray level in the obtained display device to a luminance value corresponding to each gray level in the actually-modulated display device may be 2.4%, and the obtained display device
  • the maximum deviation between the theoretical brightness value corresponding to each gray level in the display and the actual brightness value corresponding to each gray level in the modulated display device may be less than 11%.
  • the standard deviation of the theoretical brightness difference corresponding to each gray level in the obtained display device and the actually measured brightness difference corresponding to each gray level in the modulated display device satisfies the fifth range, or each gray level in the obtained display device
  • the maximum deviation between the theoretical brightness difference corresponding to the level and the brightness difference corresponding to each gray level in the modulated display device actually measured satisfies a sixth range.
  • the standard deviation of the theoretical brightness difference corresponding to each gray level in the obtained display device and the actually measured brightness difference corresponding to each gray level in the modulated display device can be calculated according to the following formula:
  • L object (n) is the theoretical brightness value corresponding to each gray level of the display device
  • n max is the maximum value of the gray level of the display device
  • n is each gray level of the display device
  • L measurement (n) is the actual measurement The brightness value corresponding to each gray level in the modulated display device.
  • the maximum deviation between the theoretical brightness difference corresponding to each gray level in the obtained display device and the actually measured brightness difference corresponding to each gray level in the modulated display device can be calculated by the following formula:
  • the manner in which the maximum deviation between the brightness difference corresponding to each gray level in the display device obtained and the actually measured brightness difference corresponding to each gray level in the modulated display device is not limited to this.
  • the standard deviation of the brightness difference corresponding to each gray level in the obtained display device and the actually measured brightness difference corresponding to each gray level in the modulated display device may be 7.3%.
  • the maximum deviation of the brightness difference corresponding to the grayscale from the actually measured brightness difference corresponding to each grayscale in the modulated display device may be less than 21%.
  • the obtained theoretical brightness value corresponding to each grayscale in the display device and the actually measured brightness corresponding to each grayscale in the modulated display device are obtained. Compare the values, and / or compare the obtained theoretical brightness difference corresponding to each gray level in the display device with the actual measured brightness difference corresponding to each gray level in the modulated display device to quantitatively obtain the actual brightness and the ideal How much is the difference in brightness, how much is the difference between each grayscale brightness gradient and the ideal brightness gradient, and makes the low grayscale area no longer a blind area during the engineer's debugging process, so that the accuracy of the brightness and the brightness curve can be accurately controlled Smoothness, that is, smoothness with excessive grayscale.
  • FIG. 10 is a functional block diagram illustrating a modulation device 600 of a brightness-grayscale curve of a display device according to an embodiment of the present disclosure.
  • the modulation device 600 executes the modulation method of the above embodiment of the present disclosure.
  • the modulation device 600 of the brightness-grayscale curve of the display device runs in an electronic terminal.
  • the modulation device 600 of the brightness-grayscale curve of the display device may include a third obtaining module 610 and a modulation module 620.
  • the third obtaining module 610 is configured to obtain a theoretical brightness value corresponding to each gray level in the display device according to a specific gamma curve.
  • the specific gamma curve includes:
  • L object max is the maximum brightness value of the display device
  • L object min is the minimum brightness value of the display device
  • n max is the maximum value of the gray scale of the display device
  • n 0 is an intermediate factor
  • n is each gray scale of the display device.
  • the L object (n) is a theoretical brightness value corresponding to each gray level of the display device.
  • the value of the gamma parameter ranges from 2.0 to 2.4.
  • the gamma parameter is determined based on a value of an environmental factor.
  • determining the gamma parameter based on the value of the environmental factor includes: when the value of the environmental factor belongs to the first environmental parameter range, the value of the gamma curve parameter belongs to the first gamma curve parameter range; when the value of the environmental factor When the value belongs to the second environmental parameter range, the value of the gamma curve parameter belongs to the second gamma curve parameter range; where the values in the first environmental parameter range are greater than the values in the second environmental parameter range, the first gamma The values within the curve parameter range are all smaller than the values within the second gamma curve parameter range.
  • the modulation module 620 modulates the brightness of the display device according to the brightness value corresponding to each gray level in the display device; wherein, the obtained theoretical brightness value corresponding to each gray level in the display device and the actually measured display device are modulated.
  • the ratio of the brightness values corresponding to each gray level satisfies the first range, and / or the ratio of the theoretical brightness difference corresponding to each gray level in the obtained display device and the brightness difference corresponding to each gray level in the actually measured display device. Meet the second range.
  • the modulation module is specifically configured to modulate the brightness of the display device according to a theoretical brightness value corresponding to each gray level of the display device and a factor of human eye pupil change.
  • the factor of the change in the pupil of the human eye includes a value corresponding to the ratio of the diameter of the pupil of the human eye under the current ambient brightness to the diameter of the pupil of the human eye under the predefined ambient brightness.
  • the first range includes 1-15% to 1 + 15%
  • the second range includes 1-30% to 1 + 30%.
  • the standard deviation of the theoretical brightness value corresponding to each gray level in the obtained display device and the actually measured brightness value corresponding to each gray level in the modulated display device satisfies the third range, or each gray level in the obtained display device
  • the maximum deviation between the theoretical brightness value corresponding to the level and the brightness value corresponding to each gray level in the modulated display device actually measured satisfies the fourth range.
  • the obtained theoretical brightness value corresponding to each grayscale in the display device and the actually measured brightness corresponding to each grayscale in the modulated display device are obtained. Compare the values, and / or compare the obtained theoretical brightness difference corresponding to each gray level in the display device with the actual measured brightness difference corresponding to each gray level in the modulated display device to quantitatively obtain the actual brightness and the ideal How much is the difference in brightness, how much is the difference between each grayscale brightness gradient and the ideal brightness gradient, and makes the low grayscale area no longer a blind area during the engineer's debugging process, so that the accuracy of the brightness and the brightness curve can be accurately controlled Smoothness, that is, smoothness with excessive grayscale.
  • Each of the above modules may be implemented by software code, and may also be implemented by hardware such as an integrated circuit chip.
  • FIG. 11 illustrates a flowchart of a method for modulating a brightness-grayscale curve of a display device according to an embodiment of the present disclosure.
  • the method includes:
  • Step S711 Determine a human-perceived brightness-grayscale application standard curve.
  • step S711 may include: determining a human eye perceived brightness-grayscale absolute standard curve; and converting a human eye perceived brightness-grayscale absolute standard curve into a human eye perceived brightness-grayscale application standard curve.
  • the measured absolute human eye-perceived luminance-grayscale absolute standard curve can be a power function curve, logarithmic curve, perceptual quantization curve, etc. Therefore, the human eye perceived luminance-grayscale applied standard curve can also be power Function curve, logarithmic curve, perceptual quantification curve, etc.
  • the gamma curve (shown below) is a power function curve
  • the Dolby curve (PQ curve) is a perceptual quantization curve. Both of them can be used as an implementation of the standard curve of brightness-grayscale perception by the human eye.
  • Step S712 Obtain a theoretical brightness value corresponding to each gray level in the display device based on at least one of a factor of changes in the pupil of the human eye, an environmental factor, and a factor related to the display device, and the human eye perceived brightness-gray scale application standard curve.
  • the theoretical brightness value corresponding to each gray level in the display device may be obtained based on the factors related to the display device and the standard curve of the brightness perceived by the human eye-gray level application.
  • the factors related to the display device may include the maximum brightness value of the display device, the minimum brightness value of the display device, the maximum value of the gray scale of the display device, and each gray scale of the display device.
  • the human-perceived brightness-grayscale application standard curve is a gamma curve
  • the theoretical brightness values corresponding to each gray level are not repeated here.
  • the theoretical brightness value corresponding to each gray level in the display device may be obtained based on the environmental factor, the factors related to the display device, and the standard curve of human-perceived brightness-gray level application.
  • the theoretical brightness value corresponding to each gray level in the display device can be obtained based on the factors of the pupil changes of the human eye and factors related to the display device and the human eye perceived brightness-gray scale application standard curve.
  • the factor of the change in the pupil of the human eye may include a value corresponding to the ratio of the diameter of the pupil of the human eye under the current ambient brightness to the diameter of the pupil of the human eye under the predefined ambient brightness.
  • the standard curve of perceived brightness-grayscale application by the human eye is a Dolby curve (PQ curve)
  • various grayscales in the display device can be obtained based on the factors of human eye pupil changes, factors related to the display device, and the Dolby curve.
  • Corresponding theoretical brightness value can be based on the following example.
  • the PQ curve is used as the standard curve for human eyes to perceive brightness-gray scale.
  • the physical brightness curve of the display device (corresponding to the brightness value corresponding to each gray level in the display device) should be:
  • the physical brightness curve of the display device (corresponding to the brightness value corresponding to each gray level in the display device) should be:
  • the gray level n is used to replace the analog voltage v therein, it can be performed according to a related linear conversion formula, and a normalization process is performed.
  • the logarithmic curve is used as the standard curve for human perception of brightness-gray scale:
  • V is the signal power
  • L is the sense of relative luminance, in the range [0,1]
  • a 0.17883277
  • b 0.28466892
  • c 0.55991073.
  • the physical brightness curve of the display device (corresponding to the theoretical brightness value corresponding to each gray level in the display device) should be:
  • the physical brightness curve of the display device (corresponding to the theoretical brightness value corresponding to each gray level in the display device) should be:
  • the theoretical brightness value corresponding to each gray level in the display device can be obtained based on factors such as pupil changes of the human eye, environmental factors, and factors related to the display device, and the standard curve of human eye perceived brightness-gray scale application.
  • the factor of human eye pupil change in the modulation method of the brightness-grayscale curve of the display device in the above embodiment may be referred to the human eye.
  • the effects of perception and related descriptions are used to obtain the theoretical brightness values corresponding to each gray level in the display device, which will not be repeated here.
  • step S713 the brightness of the display device is modulated according to the theoretical brightness value corresponding to each gray level in the display device.
  • the method further includes: receiving each gray level sent by the shooting end, where each gray level is the brightness end-gray level perceived by the shooting end according to the human eye. Determining the brightness using the standard curve and the captured image;
  • the method further includes: displaying the brightness value corresponding to each gray level received on the display device.
  • a photographing device is used to photograph the image at the shooting end, and each grey level is determined according to the human eye perceived brightness-gray scale application standard curve and the brightness of the captured image by using a photographing device or a separate processor. And transmit the respective gray scales to the display device side, since only the gray scales corresponding to the image pixels need to be transmitted during transmission, the amount of transmission can be saved, and the image device receives the image correspondence through the modulated display device on the display device side.
  • Each gray level, and the brightness-gray level curve of the display device after modulation is used to display the brightness value corresponding to each gray level, providing a complete set of image (or video) information shooting, transmission process and display standard architecture , More widely used.
  • the low-grayscale detail caused by the modulation of the liquid crystal display device with the lowest grayscale brightness other than zero using an ideal gamma curve is solved.
  • a quantifiable standard is proposed to make up for the lack of standards in the display field.
  • FIG. 12 is a functional block diagram of a modulation device 800 of a brightness-grayscale curve of a display device according to an embodiment of the present disclosure.
  • the modulation device 800 of the brightness-grayscale curve of the display device runs in an electronic terminal.
  • the modulation device 800 of the brightness-grayscale curve of the display device may include a determination module 810, a fourth obtaining module 820, and a modulation module 830.
  • the determination module 810 is configured to determine a human-perceived brightness-grayscale application standard curve.
  • the determining module 810 is specifically configured to determine an absolute standard curve of human-perceived brightness-grayscale; convert the absolute standard curve of human-perceived brightness-grayscale into a standard curve of human-perceived brightness-grayscale application.
  • a fourth obtaining module 820 is configured to obtain the corresponding grayscale correspondences in the display device based on at least one of the factors of changes in the pupil of the human eye, environmental factors, and factors related to the display device and the human eye's perceived brightness-grayscale application standard curve. The theoretical brightness value.
  • the fourth obtaining module is configured to obtain a theoretical brightness value corresponding to each gray level in the display device based on a factor related to the display device and the standard curve of perceived brightness of the human eye-gray level.
  • the fourth obtaining module is configured to obtain a theoretical brightness value corresponding to each gray level in the display device based on the environmental factor and the factors related to the display device and the human eye perceived brightness-gray level application standard curve.
  • the fourth obtaining module is configured to obtain the corresponding grayscale correspondence in the display device based on the factors of human pupil changes, factors related to the display device, and the human eye's perceived brightness-grayscale application standard curve. The theoretical brightness value.
  • the fourth obtaining module is configured to obtain each of the display devices based on a factor of changes in the pupil of the human eye, an environmental factor, a factor related to the display device, and the standard curve of the human eye ’s perceived brightness-gray scale application.
  • the factor of the change in the pupil of the human eye includes a value corresponding to the ratio of the diameter of the pupil of the human eye under the current ambient brightness to the diameter of the pupil of the human eye under the predefined ambient brightness.
  • the factors related to the display device include the maximum brightness value of the display device, the minimum brightness value of the display device, the maximum value of the gray scale of the display device, and each gray scale of the display device.
  • the modulation module 830 modulates the brightness of the display device according to the theoretical brightness value corresponding to each gray level in the display device.
  • the device may further include a processing module 840 (not shown in the figure), configured to receive each gray level sent by the shooting end before determining the human eye perceived brightness-gray level application standard curve, and each gray level It is obtained by the photographing end according to the brightness of the human eye using the standard curve to obtain the brightness of the captured image; after modulating the brightness of the display device, the brightness value corresponding to each gray level received is displayed on the display device.
  • a processing module 840 (not shown in the figure), configured to receive each gray level sent by the shooting end before determining the human eye perceived brightness-gray level application standard curve, and each gray level It is obtained by the photographing end according to the brightness of the human eye using the standard curve to obtain the brightness of the captured image; after modulating the brightness of the display device, the brightness value corresponding to each gray level received is displayed on the display device.
  • the modulation device for the brightness-grayscale curve of the display device solves the problem of unclear low-grayscale details, backlit images, high-grayscale saturation, and high-grayscale saturation caused by modulating a display device with an ideal gamma curve. Problems such as excessive color unevenness, and considering the influence of environmental factors on human eye perception, solved that the modulation of the display device using ideal gamma curve modulation will cause the visible gray scale in the dim link to no longer be able to be in a bright environment. The problem of differentiation, and a quantifiable standard is proposed, which makes up for the lack of standards in the display field.
  • Each of the above modules may be implemented by software code, and may also be implemented by hardware such as an integrated circuit chip.
  • An embodiment of the present disclosure provides an electronic device.
  • the electronic device includes a display device, a memory, and a processor.
  • the processor is coupled to the display device separately from the memory.
  • the memory stores instructions, and the instructions are executed by the processor. To enable the processor to perform the operations of the above method.
  • FIG. 13 illustrates a measured environment diagram including an electronic device.
  • the electronic device shown in the figure includes a display device, a memory, and a processor.
  • the electronic device is placed on a support frame and is coupled to a power source, a video signal generator, and an optical test device.
  • the electronic device solves the problems of low-gray-level details, blurred back-lighting, high-gray-level saturation, and excessive color unevenness caused by modulating a display device with an ideal gamma curve.
  • the effect of environmental factors on the perception of the human eye solves the problem that the modulation of the display device with the ideal gamma curve modulation will cause the visible gray levels in the dim link to no longer be able to be distinguished in a bright environment.
  • Quantifiable standards make up for the lack of standards in the display field.
  • each block in the flowchart or block diagram may represent a module, program segment, or portion of code, which contains one or more of the Execute the instruction.
  • the functions marked in the blocks may also occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved.
  • each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts can be implemented in a dedicated hardware-based system that performs the specified function or action. , Or it can be implemented with a combination of dedicated hardware and computer instructions.
  • each functional module in each embodiment of the present disclosure may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
  • the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium.
  • the technical solution of the present disclosure is essentially a part that contributes to the existing technology or a part of the technical solution may be embodied in the form of a software product.
  • the computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in various embodiments of the present disclosure.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disks or optical disks, and other media that can store program codes .
  • relational terms such as first and third are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that these entities or operations There is any such actual relationship or order among them.
  • the terms "including”, “comprising”, or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or device that includes a series of elements includes not only those elements but also those that are not explicitly listed Or other elements inherent to such a process, method, article, or device. Without more restrictions, the elements defined by the sentence “including a " do not exclude the existence of other identical elements in the process, method, article, or equipment including the elements.

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Abstract

一种显示设备的亮度-灰阶曲线的调制方法及电子设备。该方法包括：确定人眼感知亮度-灰阶应用标准曲线（S711）；基于人眼瞳孔变化的因子、环境因子及与显示设备相关的因子中的至少一个以及该人眼感知亮度-灰阶应用标准曲线，获得显示设备中各个灰阶对应的理论亮度值（S712）；根据显示设备中各个灰阶对应的理论亮度值，对显示设备的亮度进行调制（S713）。该方法解决了低灰阶细节不清，画面逆光化，高灰阶饱和及色彩过度不平滑等问题，解决了在昏暗环节下的可见灰阶在明亮环境下不再能够区分的问题，提出了一种量化的调制控制标准。

Description

显示设备的亮度-灰阶曲线的调制方法及电子设备
相关申请的交叉引用
本申请要求于2018年9月10日提交的中国专利申请第201811051290.7的优先权，该中国专利申请的全文通过引用的方式结合于此以作为本申请的一部分。
技术领域
本公开涉及显示技术领域，更具体地，本公开涉及一种显示设备的亮度-灰阶曲线的调制方法及电子设备。
背景技术
显示技术领域中，在将显示面板制备完成后，通常会采用伽马曲线对各个灰阶的亮度进行调制，尽量使得显示图像时，显示面板能够对图像中不同亮度进行准确的还原性显示。
如何让显示面板对图像中的不同亮度进行更加准确的显示是显示技术研究领域的重要课题。
发明内容
有鉴于上述情况，本公开提供了一种显示设备的亮度-灰阶曲线的调制方法、装置及电子设备。
第一方面，根据本公开实施方式，提供了一种显示设备的亮度-灰阶曲线的调制方法，包括：根据显示设备的最大亮度值、显示设备的最小亮度值、显示设备灰阶的最大值、与显示环境相关的伽马参数，获得显示设备的各个灰阶对应的理论亮度值；根据显示设备的各个灰阶对应的理论亮度值，对显示设备的亮度进行调制。
根据本公开实施例，根据显示设备的最大亮度值、显示设备的最小亮度值、显示设备灰阶的最大值及与显示环境相关的伽马参数，获得中间因子；根据显示设备的最大亮度值、显示设备灰阶的最大值、中间因子，获得显示设备的各个灰阶对应的理论亮度值。
根据本公开实施例，根据显示设备的最大亮度值、显示设备的最小亮度值、显示设备灰阶的最大值、与显示环境相关的伽马参数确定特定伽马曲线；根据所述特定伽马曲线，获得显示设备的各个灰阶对应的理论亮度值，其中，所述特定伽马曲线的中间因子是根据显示设备的最大亮度值、显示设备的最小亮度值、显示设备灰阶的最大值及与显示环境相关的伽马参数确定的。
根据本公开实施例，根据下式确定所述中间因子：
Figure PCTCN2019105161-appb-000001
其中，L 物max为显示设备的最大亮度值，L 物min为显示设备的最小亮度值，n max为显示设备灰阶的最大值，γ为与显示环境相关的伽马参数，n 0为中间因子。
根据本公开实施例，根据下式获得显示设备的各个灰阶对应的理论亮度值：
Figure PCTCN2019105161-appb-000002
其中，L 物max为显示设备的最大亮度值，n max为显示设备灰阶的最大值，n 0为中间因子，n为显示设备的各个灰阶，L 物(n)为显示设备的各个灰阶对应的理论亮度值，γ为与显示环境相关的伽马参数。
此外，根据本公开实施例，其中所述伽马参数的取值范围为2.0至2.4。
此外，根据本公开实施例，其中所述伽马参数基于环境因子的值来确定，包括：当环境因子的值的属于第一环境参数范围时，伽马曲线参数的值属于第一伽马曲线参数范围；当环境因子的值的属于第二环境参数范围时，伽马曲线参数的值属于第二伽马曲线参数范围；其中，第一环境参数范围内的值均大于第二环境参数范围内的值，第一伽马曲线参数范围内的值均小于第二伽马曲线参数范围内的值。
根据本公开实施例，获得的显示设备中各个灰阶对应的理论亮度值与实际测得的调制后的显示设备中各个灰阶对应的亮度值的比值满足第一范围、和/或获得的显示设备中各个灰阶对应的理论亮度差与实际测得的调制后的显示设备中各个灰阶对应的亮度差的比值满足第二范围。
此外，根据本公开实施例，其中所述第一范围包括1-15％至1+15％，所 述第二范围包括1-30％至1+30％。
此外，根据本公开实施例，其中获得的显示设备中各个灰阶对应的理论亮度值与实际测得的调制后的显示设备中各个灰阶对应的亮度值的标准差满足第三范围、或者获得的显示设备中各个灰阶对应的理论亮度值与实际测得的调制后的显示设备中各个灰阶对应的亮度值的最大偏差满足第四范围。
此外，根据本公开实施例，其中所述人眼瞳孔变化的因子包括与当前环境亮度下的人眼瞳孔的直径大小与预定义环境亮度下的人眼瞳孔的直径大小的比值相对应的值。
另一方面，根据本公开实施例，提供了一种显示设备的亮度-灰阶曲线的调制方法，包括：确定人眼感知亮度-灰阶应用标准曲线；基于人眼瞳孔变化的因子、环境因子及与显示设备相关的因子中的至少一个以及所述人眼感知亮度-灰阶应用标准曲线，获得显示设备中各个灰阶对应的理论亮度值；根据显示设备中各个灰阶对应的理论亮度值，对显示设备的亮度进行调制。
又一方面，根据本公开实施例，提供了一种电子设备，该电子设备包括显示设备、存储器和处理器，该处理器分别于该存储器与该显示设备耦合，该存储器中存储指令，当该指令由该处理器执行时以使该处理器执行上述方法的操作。
再一方面，根据本公开实施例，提供了一种非瞬时性计算机可读记录介质，其上已记录用于执行上述方法的程序。
根据本公开实施方式的显示设备的亮度-灰阶曲线的调制方法、装置及电子设备，其通过确定人眼感知亮度-灰阶应用标准曲线；基于人眼瞳孔变化的因子、环境因子及与显示设备相关的因子中的至少一个以及所述人眼感知亮度-灰阶应用标准曲线，获得显示设备中各个灰阶对应的理论亮度值；根据显示设备中各个灰阶对应的理论亮度值，对显示设备的亮度进行调制。上述方法解决了采用理想伽马曲线对显示设备进行调制所造成的低灰阶细节不清，画面逆光化，高灰阶饱和及色彩过度不平滑等问题，并且考虑到环境因子对人眼感知力的影响，解决了采用理想伽马曲线调制对显示设备进行调制会造成在昏暗环节下的可见灰阶在明亮环境下不再能够区分的问题，而且提出了一种可量化的标准，弥补了显示领域中对于标准的空缺。
要理解的是，前面的一般描述和下面的详细描述两者都是示例性的，并 且意图在于对提供要求保护的技术的进一步说明。
附图说明
为了更清楚地说明本公开实施例的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，应当理解，以下附图仅示出了本公开的某些实施例，因此不应被看作是对范围的限定，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他相关的附图。
图1a是示出根据本公开实施例的第一种伽马曲线的示意图；
图1b是示出根据本公开实施例的第二种伽马曲线的示意图；
图1c是示出根据本公开实施例的一种实测的人眼感知亮度-灰阶绝对标准曲线示意图；
图2是示出根据本公开实施例的一种电子设备的结构框图；
图3是示出根据本公开实施例的显示设备的亮度-灰阶曲线的调制方法的流程图；
图4是示出根据本公开实施例的显示设备的亮度-灰阶曲线的调制方法的一种具体实施方式的流程图；
图5是示出根据本公开实施例的显示设备的亮度-灰阶曲线的调制装置的功能模块示意图；
图6是示出采用传统伽马曲线进行调制后的显示设备中各个灰阶对应的亮度值与实际测得的调制后的显示设备中各个灰阶对应的亮度值的比值的曲线；
图7是示出根据本公开实施例的显示设备的亮度-灰阶曲线的调制方法的流程图；
图8是示出根据本公开实施例的通过显示设备的亮度-灰阶曲线的调制方法调制后的获得的显示设备中各个灰阶对应的理论亮度值与实际测得的调制后的显示设备中各个灰阶对应的亮度值的比值的曲线；
图9是示出根据本公开实施例的显示设备的亮度-灰阶曲线的调制方法调制后的获得的显示设备中各个灰阶对应的亮度差与实际测得的调制后的显示设备中各个灰阶对应的亮度差的比值的曲线；
图10是示出根据本公开实施例的显示设备的亮度-灰阶曲线的调制装置 的功能模块示意图；
图11是示出根据本公开实施例的显示设备的亮度-灰阶曲线的调制方法的流程图；
图12是示出根据本公开实施例的显示设备的亮度-灰阶曲线的调制装置的功能模块示意图；
图13示出了包括电子设备在内的实测环境图；
图14示出了根据本公开实施例的显示设备的亮度-灰阶曲线的调制方法的详细流程图。
具体实施方式
下面将结合本公开实施例中附图，对本公开实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本公开一部分实施例，而不是全部的实施例。通常在此处附图中描述和示出的本公开实施例的组件可以以各种不同的配置来布置和设计。因此，以下对在附图中提供的本公开实施例的详细描述并非旨在限制要求保护的本公开的范围，而是仅仅表示本公开的选定实施例。基于本公开实施例，本领域技术人员在没有做出创造性劳动的前提下所获得的所有其他实施例，都属于本公开保护的范围。
应注意到：相似的标号和字母在下面的附图中表示类似项，因此，一旦某一项在一个附图中被定义，则在随后的附图中不需要对其进行进一步定义和解释。同时，在本公开的描述中，术语“第一”、“第二”等仅用于区分描述，而不能理解为指示或暗示相对重要性。
视频信息的传播经过三个阶段：一、摄制阶段，在这个阶段中，要把光学信息转化为电信号，然后加以保存或传播；二、传输阶段，在这个阶段的传输方法主要有两种：以模拟的方式传输，或者以数字的方式传输；三、显示阶段，接收到电信号的显示装置，将电信号转换为光学信号进行视觉呈现。
在这三个阶段中，人们制定了一些标准，以便用户能够观察到正确的图像。在显示阶段，为了在显示设备中正确地显示出拍摄的视频信号，已经制定了一系列的行业标准，它决定在将电信号转化为显示设备中显示的光学信号时，不同的灰阶等级与显示的光学信号的亮度值的对应关系，这种对应关系通常被称为电光转换函数(EOTF)。虽然显示设备的选材与设计原理各不 相同，但是应用电光转换函数后，便能将灰阶等级统一地转换为光学信号的亮度值，使得所有的显示设备能够显示统一标准的画面亮度值。
通常，容易忽视以下几个问题：1、人眼对图像的感知是受到环境影响的，比如过高或过低的环境光，会干扰人眼对灰阶的分辨能力，导致对画面的感知不同；2、显示设备是否有能力全面地展示欲表现的画面。这种展示能力通常体现在最低亮度、最高亮度、色域三个方面。其中的最低亮度也往往被人们所忽视。
另外，光电转换函数(OETF)和电光转换函数(EOTF)是函数和反函数的关系，但由于显示设备和使用环境的不同，再采用这种简单的通用公式已经不能很好地满足不同用户的需求。相对于影院模式和CRT时代，显示设备和观看场所已经发生了很大的变化。
具体地，请参见图1a，图1a是示出根据本公开实施例的理想伽马曲线的示意图，对于理想伽马曲线而言，当灰阶等级为0时，其对应的亮度值也为0。但实际上，显示设备在灰阶等级为0时，其对应的亮度值不为0，若仍沿袭CRT传统，而忽略显示设备在灰阶等级为0时，其对应的亮度值不为0的情况时，采用理想伽马曲线对显示设备进行调制会造成低灰阶细节不清，画面逆光化，高灰阶饱和及色彩过度不平滑等问题。因此，我们需要一种如图1b中所示的伽马曲线，其能满足当灰阶等级为0时，其对应的亮度值不为0。
并且，当忽略环境亮度对人眼感知力的影响时，采用现有理想电光转换曲线对显示设备进行调制会造成在昏暗环境下的可见灰阶在明亮环境下不再能够区分的问题。
另外，在现有产业分工的情况下，视频信号从拍摄、传输到显示的所有环节都必须保证数据的完整性才能使得最后的显示效果得到保证。液晶显示屏作为众多厂家终端产品的显示设备，需要有固定且可量化的标准，但是现在却没有这种标准，这对于显示技术领域而言是不够的。为此，本公开提出了三个层次的标准，分别对应三种曲线，具体如下：
一、人眼感知亮度-灰阶曲线绝对标准，对应于人眼感知亮度-灰阶绝对标准曲线，该曲线来源于对人眼图像感知能力的生理物理测量结果。
具体地，根据人眼生理测试结果，建立人眼在典型舒适环境下，瞳孔大小不发生变化的状态下的人眼感知亮度-灰阶绝对标准曲线。人眼感知亮度- 灰阶绝对标准曲线是建立在标准环境下的生理物理测量基础上的，因此，这个标准是一个绝对标准。也就是说每个灰阶所对应的人眼感知亮度是一个绝对值，这个灰阶为绝对灰阶，它所对应的亮度称为绝对感知亮度。该标准的建立有助于保证标准的客观性、唯一性、与人眼感受的直接相关性和显示数据的最少的特点。
作为一个实施例，在标准舒适环境下，按照国家标准：照度200lx，照明功率密度：7W/㎡，在舒适下人眼瞳孔直径：Φ 0＝4mm。对人眼灰阶感知能力进行测量，获得人眼感知亮度-灰阶绝对标准曲线。该曲线的亮度为绝对亮度，涵盖该瞳孔直径下，所能感知的最高亮度和最低亮度范围，如图1c所示，横轴坐标为横轴坐标为人眼感知亮度Ln(nit)，纵轴坐标为灰阶n，该曲线的表现形式为：
L n＝F(n)
其中，L n表示人眼感知亮度，n表示灰阶，F()表示函数。
二.人眼感知亮度-灰阶曲线应用标准，对应于人眼感知亮度-灰阶应用标准曲线，该曲线是在人眼感知亮度-灰阶绝对标准曲线的基础上，考虑下列至少一个因素：数字信息传输条件、过往标准的历史情况和显示设备的一般能力，如色深、清晰度等所确定的曲线，其具有兼容性。
作为一种实施方式，可以根据显示设备所能表达的色深能力的能力及输出最大最小亮度的能力，采用插值法将人眼感知亮度-灰阶绝对标准曲线的灰阶分的更细以满足数字化信息传输的要求，进而形成不同的人眼感知亮度-灰阶应用标准曲线。例如：8位色深的256灰阶的人眼感知亮度-灰阶应用标准曲线、10位色深的1024灰阶的人眼感知亮度-灰阶应用标准曲线等。
作为一个具体的实施例，接上例，在人眼感知亮度-灰阶绝对标准曲线L n＝F(n)的基础上，考虑8位色深数据传输的二进制特点，在0～300nit范围内采用256灰阶进行图像表达。各灰阶间亮度差小于人眼感知亮度-灰阶绝对标准，从而获得人眼感知亮度-灰阶(256)应用标准曲线，表现形式为：
L n＝F 256(n)  (0<＝n<256)
其中，L n表示人眼感知亮度，n表示8位色深数据所表达的灰阶，0<＝n<256，F 256()表示函数。
作为另一种实施方式，考虑到历史原因以及对过往图像内容的播放，也 可以牺牲一点图像质量，形成兼容性的人眼感知亮度-灰阶应用标准曲线。
三.设备亮度-灰阶曲线标准(SEOTF)，对应于显示设备的亮度-灰阶曲线，该标准在显示设备拟采用的人眼感知亮度-灰阶曲线应用标准的基础上，基于人眼瞳孔变化的因子、环境因子及与显示设备相关的因子中的至少一个，获得显示设备的亮度-灰阶曲线，按照该显示设备的亮度-灰阶曲线在其指定的环境下显示该图，以使输出的图像信息在人眼视网膜上形成尽可能贴近传播意图的图像信息。
考虑到不同的显示设备显示能力的不同及人眼感知图像的特点(对相对亮度不敏感)，在不超过人眼感知亮度-灰阶绝对标准曲线的亮度差的精度要求的情况下，显示设备可以采用相对亮度(小于亮度差的精度要求的亮度差)来进行图像显示。
其次，本公开采用上述三个层次的标准(对应三种曲线)对显示设备的调制过程进行改进，具体如下：
1.根据标准环境下的测试结果确定人眼感知亮度-灰阶绝对标准曲线；
2.根据数字信息传输条件、显示设备的状况、过往标准的历史情况和人眼感知亮度-灰阶绝对标准曲线等，确定不同级别的人眼感知亮度-灰阶应用标准曲线；
3.基于人眼瞳孔变化的因子、环境因子及与显示设备相关的因子中的至少一个以及所述人眼感知亮度-灰阶应用标准曲线，确定显示设备的理论亮度-灰阶曲线(即获得显示设备中各个灰阶对应的理论亮度值)；
4.根据显示设备的理论亮度-灰阶曲线，对显示设备的亮度进行调制；
5.确认经实际调制后的设备亮度-灰阶曲线与其遵循的理论亮度-灰阶曲线的偏差在调试标准的范围内，即确认获得的显示设备中各个灰阶对应的理论亮度值与实际测得的调制后的显示设备中各个灰阶对应的亮度值的比值满足第一范围、和/或获得的显示设备中各个灰阶对应的理论亮度差与实际测得的调制后的显示设备中各个灰阶对应的亮度差的比值满足第二范围等。
并且，本公开还对图像(或视频)信息的摄制、传输过程及显示过程进行改进，具体如下：
一、摄制阶段，在该阶段中，采用拍摄装置拍摄图像，并采用人眼感知亮度-灰阶应用标准曲线确定图像的各个灰阶。
二、传输阶段，以数字的方式将图像各像素点的灰阶传输至显示设备。
三、显示阶段，显示设备接收该图像的各个灰阶，基于该显示设备的亮度-灰阶曲线在其指定的环境下显示该图像，经人眼屈光体作用后，在视网膜上形成符合人眼感知亮度-灰阶应用标准曲线的图像；也就是说，尽可能让一个拟呈现人眼感知亮度为L的像素，经过数字化处理、传输、在显示设备环境下显示后，通过屈光体在视网膜上形成人眼感知亮度为L的视觉体验。在具体介绍之前，首先对后续涉及到的几个概念进行解释。
L 物(n)为显示设备的各个灰阶对应的理论亮度值，各个灰阶当物理亮度曲线和各个灰阶n确定时，L 物(n)的值确定。后续文中可以将L 物(n)和L 物等同理解。
L 测(n)：是指实际测得的调制后的显示设备中各个灰阶对应的亮度值，这个亮度值为实测的物理亮度值。由于显示设备自身的一些限制，因此，L 物(n)的大小与L 测(n)的大小可能不一致，但是希望它们的值尽量保持一致，以使得调制效果更好。
其中，L 感(n)是指显示设备调制完成后，人眼感受到的以光学亮度为单位的亮度，各个灰阶当人眼感知亮度-灰阶应用标准曲线和各个灰阶n确定时，L 感(n)的值确定。后续文中可以将L 感(n)和L 感等同理解。由于人眼的特殊性(环境会对其产生影响)及显示设备自身的一些限制，L 感(n)的大小与L 物(n)的大小可能不一致，但是希望调制后使得在当前环境下人眼感受到的图像亮度L 感(n)能够与显示设备调制的亮度L 物(n)尽量保持一致。
因此，本申请中，通过使用人眼感知亮度-灰阶应用标准曲线，并结合人眼瞳孔变化的因子、环境因子及与显示设备相关的因子中的至少一个确定显示设备的物理亮度-灰阶曲线。根据此曲线调制的物理亮度-灰阶曲线经人眼屈光系统之后可在视网膜上形成还原性较好的图像。下面对人眼瞳孔及感光过程进行简单介绍。眼睛的外形是一个直径大约为23mm的球体，瞳孔直径可在2～8mm间变化。杆状细胞不能感色，但感光灵敏度极高是锥状细胞的10000倍。锥状细胞既能感光又能感色。强光作用下，主要由锥状细胞起作用，称为明视觉。弱光主要由杆状细胞起作用，称为暗视觉。锥状细胞和杆状细胞经过双极经胞与视神经相连，视神经细胞经过视神经纤维通向大脑。
感光过程大致分为四个步骤：
第一步：经水晶体成光像于视网膜。锥体细胞和杆状细胞中的感光色素 分别是视紫蓝质和视紫红质，它们受光照后发生化学变化，化学变化向相反方向进行。
第二步：上述光学变化使视网膜上点产生与光照度成正比的电位，将视网膜上的光像变为电位像；
第三步：视网膜上各个点的电位分别促使各个对应的视神经放电，放电电流是振幅恒定而频率随视网膜电位大小变化的电脉冲。
第四步：视觉皮质通常接收到200万个频率编码的电脉冲信号，首先将他们分别存入视网膜光敏细胞相对应的细胞特殊表面中，然后进行综合的图像信息处理使人产生视觉，看到景物图像。
人眼在高亮环境和低亮环境下，瞳孔的大小有所不同，经过人眼屈光系统以后投射到视网膜上的亮度也就有所不同，人眼感知的图像像素亮度与瞳孔的直径的平方成正比。不妨假设人眼瞳孔在舒适区所感知的亮度与物体的物理亮度一致。所谓舒适环境下我们定义为普通客厅的环境，作为一种实施方式，按照国家标准：照度200lx，照明功率密度：7W/㎡，在舒适下人眼瞳孔直径：Φ 0＝4mm。当然，并不局限于此。
假设根据生理物理学的测试结果，当在某个环境下，人眼的瞳孔直径为Φ时，人眼的感知亮度L 感和显示设备的理论物理亮度值L 物关系如下：
L 感＝F 1(g(Φ,Φ 0),L 物)                (1)
其中，g(Φ,Φ 0)被称之为亮度感知因子函数，F 1()表示函数，Φ 0表示在舒适下人眼通孔直径，Φ表示在某个环境下人眼的通孔直径。
通常，当人眼处于舒适环境下时，可以认为人眼屈光体传递函数：MTF＝1，此时，瞳孔大小对视觉细胞的感知能力没有影响，则此时进入眼底的入光通量等于光强度*瞳孔的面积，所以它会和瞳孔的直径的平方成正比。在成像不变的情况下，人眼感知的图像某点的亮度L 感，也与瞳孔面积成正比，将光强度近似看作L 物，此时，L 感与L 物之间的关系可以为：
L 感＝g(Φ,Φ 0)*L 物                  (2)
进一步的，瞳孔面积大小可以由公式πR^2，R为瞳孔的半径，可以发现，当人眼瞳孔的半径发生变化时，入光通量的变化与瞳孔的半径的平方成正比，为了简化计算，并且可以令：
g(Φ,Φ 0)＝(Φ/Φ 0) 2                (3)
其中，Φ 0为在初始环境下的瞳孔的直径，例如，舒适环境下，Φ 0＝4mm；Φ表示当环境发生变化导致瞳孔直径发生改变后的瞳孔的直径。
于是就有：
L 感＝g(Φ,Φ 0)*L 物＝(Φ/Φ 0) 2*L 物      (4)
进一步的，在理想情况下，可以将人眼感知亮度-灰阶绝对标准曲线分三个部分，同理，人眼感知亮度-灰阶应用标准曲线也分为分三个部分(人眼感知亮度-灰阶应用标准曲线是采用插值法将人眼感知亮度-灰阶绝对标准曲线的灰阶进行细分，因此曲线的基本形状不会改变)。一个是暗视区，一个是舒适明视区，一个是超亮区。因为三个区域的对比度灵敏度阈值，或者说韦伯-费赫涅尔系数ΔL/L＝C各个不相同。
在边缘区域，由于接近视细胞的感应极限，细胞的感知力下降，需要亮度差变大。这是调节亮度曲线特别应该加以注意的。
根据生理物理测试结果，得出人眼在舒适区域的人眼感知亮度-灰阶绝对标准曲线。然后根据人眼在不同区域的-韦伯-费赫涅尔系数(对比度最小阈值)要求，可以获得在舒适区域的人眼感知亮度-灰阶绝对标准曲线。
L 感＝H(n)                     (5)
其中：
Figure PCTCN2019105161-appb-000003
下面对L 感的分段曲线以一个示例进行说明。
请参阅图1c，图1c示出了表示实测的人眼感知亮度-灰阶绝对标准曲线示意图，其中，横轴坐标为lg(L 感)，纵轴坐标为灰阶n。从图1c中，可以看出，人眼感知亮度的变化值ΔL 感，与灰阶的变化值Δn近似存在下述关系：
Δn＝k*(ΔL 感/L 感)               (7)
当Δn＝1时，(ΔL 感/L 感)＝1/k,按照韦伯定律(即ΔL 感/L 感＝常数)，在人眼舒适区1/k为常数，用C表示，灰阶n的函数表达式经过多次测量可以为：
n＝k*In(L 感)+C                    (8)
其中，Ln()表示自然对数，即以e为底的对数。
实际上，请参阅图1c，在整个区间上，1/k并不为常数，韦伯定律适用的范围在1～1000nit。在亮度低于1nit，高于1000nit的区间，k较小，也就是说1/k较大，为2.6％以上。而在1～1000nit区间，k较大。
可以理解的是，上述是对人眼感知亮度-灰阶绝对标准曲线进行描述，人眼感知亮度-灰阶应用标准曲线只需对其进一步进行变换可得，不再赘述。
对于在瞳孔调节边缘的情况(例如，亮度很低或者很高的情况)，由于瞳孔的调节能力变弱，人眼感知亮度L 感主要与显示设备亮度L 物正相关，可以用下述曲线表示：
L 感＝c 1*L 物+c 2                  (9)
另外，要实现人眼对传播图像的还原性感受，首先要保证图像的所有灰阶能够在人眼中展示出来。即，从感受到的最低亮度到最高亮度之间，各个灰阶能够无阶梯地在人眼的感受中平滑地连接起来。
从图像传输的角度来讲，又希望这些数据尽可能地少，所以显示设备的各个灰阶的物理亮度差要尽量接近人眼可识别的亮度差。在人眼舒适区域，根据韦伯定律：
(ΔL 物/L 物)＝C                  (10)
其中C为常数，那么就有：
L 物(n+1)＝L 物(n)*(1+C)               (11)
如果：L 物(0)＝L 物min                                          (12)
则：
L 物(n)＝L 物min*(1+C) n              (13)
Figure PCTCN2019105161-appb-000004
从而可以得到：
n max＝Lg(L 物max/L 物min)/Lg(1+C)     (15)
其中，L 物(n)表示灰阶为n时显示设备的亮度，L 物(n+1)表示灰阶为n+1时显示设备的亮度，Lg()表示以10为底的对数，L 物max为显示设备的最大亮度值，L 物min为显示设备的最小亮度值，n max为显示设备灰阶的最大值。因此，在舒适区内的灰阶数至少应该大于n max。
例如，普通显示设备的显示亮度在0.3～300nit之间，常数C＝3％，这时 n max＝233。这种情况下，采用256灰阶的亮度显示已经可以满足其显示要求。
基于上述分析，在设置显示设备的物理亮度-灰阶曲线时，可以考虑以下几个原则：
(1)L 物＝L 感*(Φ 0/Φ) 2                                       (16)
(2)根据显示设备的最低最高亮度，确定人眼能感知的最低最高亮度；
(3)根据人眼能感知的最低最高亮度，确定需要的n max的最小值；
(4)特别注意在暗视区(<1nit)和超亮区(>1000nit)要保证足够的亮度梯度，否则容易造成低灰阶过饱和和高灰阶饱和的现象；
(5)显示设备所能达到的最低物理亮度应作为标准曲线最低灰阶的起点，而不是以0亮度作为标准曲线的起点；
(6)兼顾实际应用中的其他情况。
综合上述的几个原则，在获得的显示设备的各个灰阶对应的理论亮度值L 物时，可以根据下述公式：
(1)当确定L 感＝Y 1(n 0,n,L 物max，L 物min)时：
L 物＝g(Φ,Φ 0)*Y 1(n 0,n,L 物max，L 物min)          (17)
由于Y 1(n)是个实验曲线，所以，更概括的一个公式可以表述为：
L 物＝Y 2(n 0,n,L 物max,L 物min,Φ,Φ 0)           (18)
其中，n 0表示中间因子，
当n＝0时，L 物min＝Y 2(n 0,0,L 物max,L 物min,Φ,Φ 0)                  (19)
当n＝n max时，L 物max＝Y 2(n 0,n max,L 物max,L 物min,Φ,Φ 0)                (20)
并且当Φ＝Φ 0，即瞳孔直径未发生变化时，L 感＝L 物，此时
L 感＝L 物＝Y 2(n 0,n,L 物max,L 物min,Φ 0,Φ 0)         (21)
(2)进一步的，当在理想情况下，L 感取三段曲线时，对应的L 物也是三段曲线。
Figure PCTCN2019105161-appb-000005
其中，
当n＝0时，
在暗视区：L 物min1＝Y 3(n 0,0,L 物max,L 物min,Φ,Φ 0)              (23)
在明视区：L 物min2＝Y 4(n 0,0,L 物max,L 物min,Φ,Φ 0)              (24)
在超亮区：L 物min3＝Y 5(n 0,0,L 物max,L 物min,Φ,Φ 0)              (25)
当n＝n max时，
在暗视区：L 物max1＝Y 3(n 0,n max,L 物max,L 物min,Φ,Φ 0)            (26)
在明视区：L 物max2＝Y 4(n 0,n max,L 物max,L 物min,Φ,Φ 0)            (27)
在超亮区：L 物max3＝Y 5(n 0,n max,L 物max,L 物min,Φ,Φ 0)            (28)
且并且当Φ＝Φ 0，即瞳孔直径未发生变化时，L 感＝L 物，此时：
Figure PCTCN2019105161-appb-000006
其中，L 感可以为幂函数曲线、对数曲线、感知量化曲线等，Y 1()、Y 2()、Y 3()、Y 4()、Y 5()表示伽马函数。
其中，伽马曲线(如下所示)是一种幂函数曲线，其可以作为在明视区的L 感。如果要显示更为宽广的区域，那么韦伯定律就不再适用了。经验上，我们把0～0.1nit，以及大于1000nit的亮度区域认为是非舒适区。作为另一种实施方式，杜比曲线(PQ曲线)是一种感知量化曲线，它也可以作为L 感的一种实施方式。
具体的实施方式，会在后续的实施方式及实施例中进行详细描述。
图2是示出根据本公开实施例的一种电子设备的结构框图。电子设备包括存储器110、处理器120以及显示设备130。
存储器110可用于存储软件程序以及模块，如本公开实施例中的显示设备的亮度-灰阶曲线的调制方法及装置对应的程序指令/模块，处理器120通过运行存储在存储器110内的软件程序以及模块，从而执行各个种功能应用以及数据处理，即实现本公开实施例中的显示设备的亮度-灰阶曲线的调制方法。存储器110可包括高速随机存储器，还可包括非易失性存储器，如一个或者多个磁性存储装置、闪存、或者其他非易失性固态存储器等。进一步地，上述存储器110内的软件程序以及模块还可包括：操作系统111以及服务模块112。其中操作系统111，例如可为LINUX、UNIX、WINDOWS等，其可包括各个种用于管理系统任务(例如内存管理、存储设备控制、电源管理等)的软件组件和/或驱动，并可与各个种硬件或软件组件相互通讯，从而提供其他软件组件的运行环境。服务模块112运行在操作系统111的基础上，并通 过操作系统111的网络服务监听来自网络的请求，根据请求完成相应的数据处理。
显示设备130可以用于显示图像，显示设备130可以包括二维显示器和三维显示器等等。进一步的，二维显示器又可以包括CRT(Cathode Ray Tube，阴极射线管)显示器和LCD(Liquid Crystal Display，液晶显示器)显示器等，当然，并不局限于此。
可以理解，图2所示的结构仅为示意，电子设备还可包括比图2中所示更多或者更少的组件，或者具有与图2所示不同的配置。图2中所示的各个组件可以采用硬件、软件或其组合实现。
下面将结合附图对本公开实施例中的显示设备的亮度-灰阶曲线的调制方法及装置进行更详细的描述。
根据本公开实施例，首先，根据显示设备的最大亮度值、显示设备的最小亮度值、显示设备灰阶的最大值、与显示环境相关的伽马参数，获得显示设备的各个灰阶对应的理论亮度值；然后，根据显示设备的各个灰阶对应的理论亮度值，对显示设备的亮度进行调制。应了解，所述的显示设备灰阶的最大值反映了显示设备所能表达的色深能力的能力，所述的显示设备的最大亮度值和最小亮度值反映了显示设备输出最大最小亮度的能力。
图3示出了根据本公开实施例的显示设备的亮度-灰阶曲线的调制方法的流程图，请参阅图3，本实施例描述的是当在舒适环境下人眼感知亮度-灰阶应用标准曲线(对应的是L 感(n))确定为伽马曲线时，该方法包括：
步骤S211，根据显示设备的最大亮度值、显示设备的最小亮度值、显示设备灰阶的最大值及与显示环境相关的伽马参数，获得中间因子。
作为一种实施方式，步骤S211中的所述中间因子可以根据下述公式进行计算：
Figure PCTCN2019105161-appb-000007
其中，L 物max为显示设备的最大亮度值，L 物min为显示设备的最小亮度值，n max为显示设备灰阶的最大值，γ为伽马曲线的与显示环境相关的伽马参数，n 0为中间因子。
其中，L 物max和L 物min的值可以通过测量获得。例如，可以在输入最大灰阶 的情况下，测量L 物max，以及在输入最小灰阶的情况下，测量L 物min。并且，当待调制的显示设备制造后，L 物max、L 物min、及n max的值确定。并且，具体的，n max的取值范围可以例如是63、125、255、511、1023等，当然，并不局限于此。
可以理解的是，获得中间因子的实施方式并不局限于上述公式，也可以根据其它公式或者上述的公式的变化获得。
进一步的，作为示例，伽马参数的取值范围可以为2.0至2.4。在另一示例中，伽马曲线参数的取值范围可以为2.18至2.4。在另一示例中，例如，伽马曲线参数的值可以是1.8、2.0、2.1、2.2、2.3、2.4等等。通过将伽马曲线参数的值设置在此取值范围内，使得显示设备的显示效果得到优化。
进一步的，考虑到环境因子对人眼感知力的影响，作为另一示例，该伽马参数可以基于环境因子的值来确定。
其中，环境因子可以包括：环境的亮度值等。例如，可以根据环境因子判断出当前环境是明亮(办公)环境还是昏暗(暗室)环境等。
作为示例，当环境因子的值的属于第一环境参数范围时，伽马曲线参数的值的范围可以属于第一伽马曲线参数范围；当环境因子的值的属于第二环境参数范围时，伽马曲线参数的值的范围可以属于第二伽马曲线参数范围；其中，第一环境参数范围内的值大于第二环境参数范围内的值，第一伽马曲线参数范围内的值小于第二伽马曲线参数范围内的值。
例如，若环境因子的值为环境的亮度值时，当环境的亮度值属于明亮(办公)环境对应的亮度值范围时，则伽马曲线参数的值的可以为2.2，当环境的亮度值属于昏暗(暗室)环境对应的亮度值范围时，则伽马曲线参数的值的范围可以为2.4。当然，当前数值仅为示例，还可采用其他数值，例如与当前示例数值接近的其他数值。
由此，当环境因子的值较小时(昏暗环境)，则伽马曲线参数较大，当环境因子的值较大时(明亮环境)，则伽马曲线参数较小，通过这种方式进行调制，使得显示设备显示进一步得到优化。
上述方式，考虑到环境因子对人眼感知力的影响，解决了采用理想伽马曲线调制对显示设备进行调制会造成在昏暗环节下的可见灰阶在明亮环境下不再能够区分的问题。
当然，除了考虑到环境因子对人眼感知力的影响，还可以考虑其他因子对人眼瞳孔变化的影响。例如，但不限于，与显示设备相关的因子、及与人体相关的因子等。
其中，与显示设备相关的因子可以包括：显示设备屏幕的尺寸、显示设备的亮度、显示设备与用户的距离中的至少一个。具体的，显示设备的亮度又可以包括显示设备的平均使用亮度、最大亮度、最小亮度等，但并不局限于此。可以理解的是，由于显示设备屏幕的尺寸以及显示设备与人体的距离也可能影响到显示设备在人眼中的立体角度，因此，与显示设备相关的因子也可以包括：显示设备在人眼中的立体角。
考虑到显示设备屏幕的尺寸、显示设备的亮度、显示设备与人体的距离中的至少一个均会对瞳孔的变化产生影响，因此采用这些参数作为与显示设备相关的因子，使得对显示设备进行调制更加准确。
其中，与人体相关的因子可以包括：人眼的瞳孔尺寸等。
由此，将与人体相关的因子具体到人眼的瞳孔尺寸，使得对伽马曲线对显示设备进行调制更加准确，能够缓解不同显示亮度带来的影响。
具体地，获取影响人眼瞳孔变化的因子的方式也有很多种，例如，可以通过光传感器获取到环境的亮度值，也可以通过检测设备检测与显示设备相关的因子或者直接从显示设备中读取显示设备屏幕的尺寸等参数，还可以通过眼部检测仪器测量出人眼的瞳孔尺寸等，并不局限与此。通过考虑到上述影响人眼瞳孔变化因子，可以进一步的对该伽马参数进行调制，从而进一步优化调制的结果。
返回图3，图3所示的显示设备的亮度-灰阶曲线的调制方法还包括步骤S212，根据显示设备的最大亮度值、显示设备灰阶的最大值、中间因子及显示设备的各个灰阶，获得显示设备的各个灰阶对应的理论亮度值。
作为一种实施方式，步骤S212可以根据下述公式进行计算：
Figure PCTCN2019105161-appb-000008
其中，L 物max为显示设备的最大亮度值，n max为显示设备灰阶的最大值，n 0为中间因子，n为显示设备的某个灰阶，L 物(n)为显示设备的某个灰阶对应的理论亮度值，γ为伽马曲线的与显示环境相关的伽马参数。
具体的，L 物max和L 物min的值可以通过测量获得。n max的取值范围可以例如是63、125、255、511、1023等，即n max的取值可以为2的次方减1，当然，并不局限于此。n max的取值取决于两个相邻灰阶间的亮度差要保持小于或接近于人眼可感知的最小亮度差，同时n max的取值又要尽可能小，以减轻图像数据的传输量。作为一种实施方式，在中等尺寸、亮度较高的显示设备上，n max的值可以为255。在更高亮度的显示设备上，n max的值可以为1023。
通过步骤S211求解得到n 0，因此，当显示设备的各个灰阶n确定时，即可求出对应的显示设备的各个灰阶对应的理论亮度值L 物(n)。通过上述公式，合理且可执行提出了一种可量化的标准，弥补了液晶显示领域中对于可量化的转换控制标准的空缺。
可以理解的是，获得显示设备的各个灰阶对应的理论亮度值的实施方式并不局限于上述公式，也可以根据其它公式或者上述的公式的变化获得。
返回图3，图3所示的显示设备的亮度-灰阶曲线的调制方法还包括步骤S213，根据显示设备的各个灰阶对应的理论亮度值，对显示设备的亮度进行调制。
请参阅图4，图4给出一种显示设备的亮度-灰阶曲线的调制方法的具体的实施方式。
步骤S311,根据下面公式，获得中间因子。
Figure PCTCN2019105161-appb-000009
其中，L 物max为显示设备的最大亮度值，L 物min为显示设备的最小亮度值，n max为显示设备灰阶的最大值，γ为与显示环境相关的伽马参数，n 0为中间因子。
步骤S312,根据下面公式，获得显示设备的各个灰阶对应的理论亮度值。
Figure PCTCN2019105161-appb-000010
其中，L 物max为显示设备的最大亮度值，n max为显示设备灰阶的最大值，n 0为中间因子，n为显示设备的各个灰阶，L 物(n)为显示设备的各个灰阶对应的理论亮度值，γ为与显示环境相关的伽马参数。
步骤S313,根据显示设备的各个灰阶对应的理论亮度值，对显示设备的亮度进行调制。例如，对于每个灰阶，将显示设备的输出亮度调整到与该灰 阶对应的理论亮度值，或者调整到与该理论亮度值相差在预定误差范围内的亮度值。
下面将具体给出五种不同的具体示例对获得显示设备的各个灰阶对应的理论亮度值的情况进行说明。
【示例一】
对于液晶显示设备，例如是SDR的液晶显示设备，如果其显示设备的最低灰阶的值对应的亮度值为0，那么根据CRT显示器的伽马曲线，如果其应用场景为一般办公环境(明亮环境)，例如，环境照度200lx，照明功率密度7W/㎡，显示设备的最大亮度值为250nit，则所选择的与显示环境相关的伽马曲线参数γ为2.2，根据公式计算出中间因子n 0为0，且：
Figure PCTCN2019105161-appb-000011
其中，L 物(n)为显示设备的各个灰阶对应的理论亮度值，L 物max为显示设备的最大亮度值，n为显示设备的各个灰阶。
【示例二】
对于液晶显示设备，例如是SDR的液晶显示设备，如果其显示设备的最低灰阶的值对应的亮度值不为0，而是L 物min，那么根据CRT显示器的伽马曲线，如果其应用场景为一般办公环境(明亮环境)，例如：显示设备的最大亮度值为250nit，环境照度：200lx，照明功率密度：7W/平米，显示设备灰阶的最大值为255，则所选择的与显示环境相关的伽马曲线参数γ为2.2，根据下面公式进行计算：
Figure PCTCN2019105161-appb-000012
Figure PCTCN2019105161-appb-000013
Figure PCTCN2019105161-appb-000014
其中，L 物(n)为显示设备的各个灰阶对应的理论亮度值，L 物max为显示 设备的最大亮度值，n为显示设备的各个灰阶，n 0为中间因子，L 物min为显示设备的最小亮度值，n max为显示设备灰阶的最大值。
【示例三】
对于液晶显示设备，例如是SDR的液晶显示设备，如果其显示设备的最低灰阶的值对应的亮度值不为0，而是L 物min，那么根据CRT显示器的伽马曲线，如果其应用场景为专业暗室/影院环境(昏暗环境)，例如显示器最高亮度为250nit，环境照度5lx，显示设备灰阶的最大值为255，则所选择的与显示环境相关的伽马曲线参数γ为2.4，根据下面公式进行计算：
Figure PCTCN2019105161-appb-000015
Figure PCTCN2019105161-appb-000016
Figure PCTCN2019105161-appb-000017
其中，L 物(n)为显示设备的各个灰阶对应的理论亮度值，L 物max为显示设备的最大亮度值，n为显示设备的各个灰阶，n 0为中间因子，L 物min为显示设备的最小亮度值，n max为显示设备灰阶的最大值。
【示例四】
对于液晶显示设备，例如是SDR的液晶显示设备，如果其显示设备的最低灰阶的值对应的亮度值不为0，而是L 物min，那么根据CRT显示器的伽马曲线，如果其应用场景为一般办公环境(明亮环境)，例如环境亮度为55nit，显示器最高亮度为250nit，不妨设当中间灰阶L 127也为55nit时，为最舒适的观看显示效果，显示设备灰阶的最大值为255，则所选择的与显示环境相关的伽马曲线参数为γ且值约为2.18，并且根据下面公式进行计算：
Figure PCTCN2019105161-appb-000018
Figure PCTCN2019105161-appb-000019
Figure PCTCN2019105161-appb-000020
L 物(127)＝55
其中，L 物(n)为显示设备的各个灰阶对应的理论亮度值，L 物max为显示设备的最大亮度值，n为显示设备的各个灰阶，n 0为中间因子，L 物min为显示设备的最小亮度值，n max为显示设备灰阶的最大值。当然。也可以根据人眼感知亮度-灰阶绝对标准来进行计算。
【示例五】
对于液晶显示设备，例如是LCD的液晶显示设备，如果其显示设备的最低灰阶的值对应的亮度值不为0，而是L 物min，那么根据LCD显示器的伽马曲线，如果其应用场景为影院模式，假设舒适环境亮度下的人眼瞳孔的直径大小Φ 0，并假设在该影院模式下的人眼瞳孔的直径大小Φ，将瞳孔直径大小对人眼感知亮度的影响通过设置与显示环境相关的伽马曲线参数γ的大小来体现，由于在舒适环境下γ取2.2以及CRT光电转换函数的指数值为2.4，因此这里γ的取值可以为2.4，则根据下面公式进行计算：
Figure PCTCN2019105161-appb-000021
Figure PCTCN2019105161-appb-000022
其中，L 物(n)为显示设备的各个灰阶对应的理论亮度值，L 物max为显示设备的最大亮度值，n为显示设备的各个灰阶，n 0为中间因子，L 物min为显示设备的最小亮度值，n max为显示设备灰阶的最大值。
通过本公开实施例提供的显示设备的亮度-灰阶曲线的调制方法，通过根据显示设备的最大亮度值、显示设备的最小亮度值、显示设备灰阶的最大值及与显示环境相关的伽马参数，获得中间因子，并且进一步的根据显示设备的最大亮度值、显示设备灰阶的最大值、中间因子及显示设备的各个灰阶，获得显示设备的各个灰阶对应的理论亮度值，从而解决了采用理想伽马曲线 对显示设备进行调制所造成的低灰阶细节不清，画面逆光化，高灰阶饱和及色彩过度不平滑等问题，并且考虑到环境因子对人眼感知力的影响，解决了采用理想伽马曲线调制对显示设备进行调制会造成在昏暗环节下的可见灰阶在明亮环境下不再能够区分的问题，而且提出了一种可量化的标准，弥补了显示领域中对于标准的空缺。
图5是示出根据本公开实施例的显示设备的亮度-灰阶曲线的调制装置400的功能模块示意图。当在舒适环境下人眼感知亮度-灰阶应用标准曲线(对应的是L 感(n))确定为伽马曲线时，根据本公开实施例的调制装置400执行本公开实施例的调制方法。
该显示设备的亮度-灰阶曲线的调制装置400运行于电子终端中。该显示设备的亮度-灰阶曲线的调制装置400可以包括第一获得模块410、第二获得模块420、及调制模块430。
第一获得模块410，用于根据显示设备的最大亮度值、显示设备的最小亮度值、显示设备灰阶的最大值及与显示环境相关的伽马参数，获得中间因子。
作为示例，所述第一获得模块410，具体用于获得
Figure PCTCN2019105161-appb-000023
其中，L 物max为显示设备的最大亮度值，L 物min为显示设备的最小亮度值，n max为显示设备灰阶的最大值，γ为与显示环境相关的伽马参数，n 0为中间因子。
进一步的，作为示例，所述伽马参数的取值范围为2.0至2.4。
进一步的，作为示例，所述伽马参数基于环境因子的值来确定。
具体的，作为示例，所述伽马参数基于环境因子的值来确定包括：当环境因子的值的属于第一环境参数范围时，伽马曲线参数的值属于第一伽马曲线参数范围；当环境因子的值的属于第二环境参数范围时，伽马曲线参数的值属于第二伽马曲线参数范围；其中，第一环境参数范围内的值均大于第二环境参数范围内的值，第一伽马曲线参数范围内的值均小于第二伽马曲线参数范围内的值。
第二获得模块420，用于根据显示设备的最大亮度值、显示设备灰阶的 最大值、中间因子及显示设备的各个灰阶，获得显示设备的各个灰阶对应的理论亮度值。
作为示例，所述第二获得模块420，具体用于获得
Figure PCTCN2019105161-appb-000024
其中，L 物max为显示设备的最大亮度值，n max为显示设备灰阶的最大值，n 0为中间因子，n为显示设备的各个灰阶，L 物(n)为显示设备的各个灰阶对应的理论亮度值，γ为与显示环境相关的伽马参数。
调制模块430，用于根据显示设备的各个灰阶对应的理论亮度值，对显示设备的亮度进行调制。
作为示例，所述调制模块，具体用于根据显示设备的各个灰阶对应的理论亮度值及人眼瞳孔变化的因子，对显示设备的亮度进行调制。
具体地，所述人眼瞳孔变化的因子包括与当前环境亮度下的人眼瞳孔的直径大小与预定义环境亮度下的人眼瞳孔的直径大小的比值相对应的值。
通过本公开实施例提供的显示设备的亮度-灰阶曲线的调制装置，通过根据显示设备的最大亮度值、显示设备的最小亮度值、显示设备灰阶的最大值及与显示环境相关的伽马参数，获得中间因子，并且进一步的根据显示设备的最大亮度值、显示设备灰阶的最大值、中间因子及显示设备的各个灰阶，获得显示设备的各个灰阶对应的理论亮度值，从而解决了采用理想伽马曲线对显示设备进行调制所造成的低灰阶细节不清，画面逆光化，高灰阶饱和及色彩过度不平滑等问题，并且考虑到环境因子对人眼感知力的影响，解决了采用理想伽马曲线调制对显示设备进行调制会造成在昏暗环节下的可见灰阶在明亮环境下不再能够区分的问题，而且提出了一种可量化的标准，弥补了显示领域中对于标准的空缺。
以上各个模块可以是由软件代码实现，也同样可以由硬件例如集成电路芯片实现。
请参阅图6，图6示出的是采用传统伽马曲线进行调制后的，理想的显示设备中各个灰阶对应的亮度值与实际测得的调制后的显示设备中各个灰阶对应的亮度值的比值的曲线。其中，传统伽马曲线可以是
Figure PCTCN2019105161-appb-000025
对于采用传统伽马曲线进行调制后，会出现在低阶的时候，显示设备中各个灰阶对应的亮度值(即根据传统伽马曲线计算获得的显示设备中各个灰阶对应的理论亮度值)与实际测得的调制后的显示设备中各个灰阶对应的亮度值的比值较小的情况。如果不加以调整，直接用它来显示画面，在画面的低灰阶就会出现亮度差不足，暗阶细节表现不明显，画面阴影部位发暗的现象。整个图像犹如逆光拍摄的一样。
为了克服这种现象，通常会进行伽马校正。例如，可以通过数据变换，用更高的亮度值来替代那些过低的亮度，也就是说实际上舍弃了某些较低的物理灰阶；通过递推，舍弃的灰阶通常会集中到高亮灰阶上，这时画面的高亮部位细节差就会消失。如果舍弃的灰阶放到中等亮度部位，一些中间灰阶丢失，全色域测试画面的颜色过度就会出现台阶。表现在肤色上，局部肤色色差消失，就像涂了蜡一样，高亮部位就会发白。也可以通过FRC(Frame Rate Conversion，帧速率转换)，用高亮度灰阶与低亮度灰阶轮流显示达到让低灰阶亮度提升的视觉效果。但是用那些灰阶轮替，用多少个子像素轮替、轮替的周期是多少，轮替后是否会产生闪烁、网格或波纹，在那些灰阶上轮替都很难协调确定。
为了解决上述问题，请参见图7，图7示出了根据本公开实施例的显示设备的亮度-灰阶曲线的调制方法的流程图。当在舒适环境下人眼感知亮度-灰阶应用标准曲线(对应的是L 感(n))为特定伽马曲线时，该方法包括：
步骤S511，根据特定伽马曲线，获得显示设备中各个灰阶对应的理论亮度值。
作为示例，所述特定伽马曲线包括：
Figure PCTCN2019105161-appb-000026
Figure PCTCN2019105161-appb-000027
其中，L 物max为显示设备的最大亮度值，L 物min为显示设备的最小亮度值，n max为显示设备灰阶的最大值，n 0为中间因子，n为显示设备的各个灰阶，L 物(n)为显示设备的各个灰阶对应的理论亮度值，γ为与显示环境相关的伽马参数。
进一步的，作为示例，所述伽马参数的取值范围为2.0至2.4。
作为另一示例，所述伽马参数基于环境因子的值来确定。
具体地，所述伽马参数基于环境因子的值来确定包括：当环境因子的值的属于第一环境参数范围时，伽马曲线参数的值属于第一伽马曲线参数范围；当环境因子的值的属于第二环境参数范围时，伽马曲线参数的值属于第二伽马曲线参数范围；其中，第一环境参数范围内的值均大于第二环境参数范围内的值，第一伽马曲线参数范围内的值均小于第二伽马曲线参数范围内的值。
对于该特定伽马曲线及相应的伽马参数的进一步说明，可以参考本申请上述实施例中的描述，此处不再赘述。
步骤S512，根据显示设备中各个灰阶对应的亮度值，对显示设备的亮度进行调制，其中，获得的显示设备中各个灰阶对应的理论亮度值与实际测得的调制后的显示设备中各个灰阶对应的亮度值的比值满足第一范围、和/或获得的显示设备中各个灰阶对应的亮度差与实际测得的调制后的显示设备中各个灰阶对应的亮度差的比值满足第二范围。
其中，获得的显示设备中各个灰阶对应的理论亮度值与实际测得的调制后的显示设备中各个灰阶对应的亮度值的比值可以根据公式：
Figure PCTCN2019105161-appb-000028
进行计算，当然计算方式并不局限于此。
其中，获得的显示设备中各个灰阶对应的亮度差与实际测得的调制后的显示设备中各个灰阶对应的亮度差的比值：
Figure PCTCN2019105161-appb-000029
进行计算，当然计算方式并不局限于此。
作为示例，根据显示设备的各个灰阶对应的理论亮度值，对显示设备的亮度进行调制，包括：根据显示设备的各个灰阶对应的理论亮度值及人眼瞳孔变化的因子，对显示设备的亮度进行调制。
具体地，所述人眼瞳孔变化的因子包括与当前环境亮度下的人眼瞳孔的直径大小与预定义环境亮度下的人眼瞳孔的直径大小的比值相对应的值。
作为示例，所述第一范围可以包括1-15％至1+15％，当然，并不局限与此，也可以是更小的范围，例如：1-10％至1+10％、1-8％至1+8％、1-6％至1+6％等等；或者，也可以是更大的范围，例如：1-15％至1+15％、1-18％至1+18％、1-20％至1+20％等等。
请参阅图8，图8示出的是根据本公开实施例的显示设备的亮度-灰阶曲 线的调制方法调制后的，获得的显示设备中各个灰阶对应的理论亮度值与实际测得的调制后的显示设备中各个灰阶对应的亮度值的比值的曲线，其中，横轴为显示设备的各个灰阶，纵轴为获得的显示设备中各个灰阶对应的理论亮度值与实际测得的调制后的显示设备中各个灰阶对应的亮度值的比值。可以理解的是，图8中横轴为0～255是取值范围(未完全示出)。
可见，获得的显示设备中各个灰阶对应的理论亮度值与实际测得的调制后的显示设备中各个灰阶对应的亮度值的比值的范围可以是0.88至1.03。
通过使得获得的显示设备中各个灰阶对应的理论亮度值与实际测得的调制后的显示设备中各个灰阶对应的亮度值的比值满足第一范围，使得获得的显示设备中各个灰阶对应的理论亮度值与实际测得的调制后的显示设备中各个灰阶对应的亮度值的偏离程度更小，即使得通过计算获得的显示设备中各个灰阶对应的理论亮度值更加接近于实际测得的调制后的显示设备中各个灰阶对应的亮度值，使得调制的效果更佳。
作为示例，所述第二范围包括1-30％至1+30％，当然，并不局限与此，也可以是更小的范围，例如：1-20％至1+20％、1-15％至1+15％、1-15％至1+15％等等；或者，也可以是更大的范围，例如：1-26％至1+26％、1-28％至1+28％、1-30％至1+30％等等。
请参阅图9，图9示出的是根据本公开实施例的显示设备的亮度-灰阶曲线的调制方法调制后的，获得的显示设备中各个灰阶对应的理论亮度差与实际测得的调制后的显示设备中各个灰阶对应的亮度差的比值的曲线，其中，横轴为显示设备的各个灰阶，纵轴为获得的显示设备中各个灰阶对应的亮度差与实际测得的调制后的显示设备中各个灰阶对应的亮度差的比值。可以理解的是，图8中横轴为0～255是取值范围(未完全示出)。
可见，获得的显示设备中各个灰阶对应的亮度差与实际测得的调制后的显示设备中各个灰阶对应的亮度差的比值可以是0.75至1.2。
通过使得获得的显示设备中各个灰阶对应的理论亮度差与实际测得的调制后的显示设备中各个灰阶对应的亮度差的比值满足第二范围，使得调制后的显示设备的色彩波动更小，色彩过度更加平滑。
作为示例，获得的显示设备中各个灰阶对应的理论亮度值与实际测得的调制后的显示设备中各个灰阶对应的亮度值的标准差满足第三范围、或者获 得的显示设备中各个灰阶对应的理论亮度值与实际测得的调制后的显示设备中各个灰阶对应的亮度值的最大偏差满足第四范围。
其中，获得的显示设备中各个灰阶对应的理论亮度值与实际测得的调制后的显示设备中各个灰阶对应的亮度值的标准差可以根据下述公式计算：
Figure PCTCN2019105161-appb-000030
其中，L 物(n)为显示设备的各个灰阶对应的理论亮度值，n max为显示设备灰阶的最大值，n为显示设备的各个灰阶，L 测(n)为实际测得的调制后的显示设备中各个灰阶对应的亮度值。
获得的显示设备中各个灰阶对应的理论亮度值与实际测得的调制后的显示设备中各个灰阶对应的亮度值的最大偏差可以根据下述公式进行计算：
Figure PCTCN2019105161-appb-000031
当然，计算获得的显示设备中各个灰阶对应的理论亮度值与实际测得的调制后的显示设备中各个灰阶对应的亮度值的最大偏差的方法并不局限于此。
作为示例，获得的显示设备中各个灰阶对应的理论亮度值与实际测得的调制后的显示设备中各个灰阶对应的亮度值的标准差的比值可以为2.4％，并且，获得的显示设备中各个灰阶对应的理论亮度值与实际测得的调制后的显示设备中各个灰阶对应的亮度值的最大偏差可以小于11％。
作为示例，获得的显示设备中各个灰阶对应的理论亮度差与实际测得的调制后的显示设备中各个灰阶对应的亮度差的标准差满足第五范围、或者获得的显示设备中各个灰阶对应的理论亮度差与实际测得的调制后的显示设备中各个灰阶对应的亮度差的最大偏差满足第六范围。
其中，获得的显示设备中各个灰阶对应的理论亮度差与实际测得的调制后的显示设备中各个灰阶对应的亮度差的标准差可以根据下述公式计算：
Figure PCTCN2019105161-appb-000032
其中，L 物(n)为显示设备的各个灰阶对应的理论亮度值，n max为显示设备灰阶的最大值，n为显示设备的各个灰阶，L 测(n)为实际测得的调制后的显示设备中各个灰阶对应的亮度值。
获得的显示设备中各个灰阶对应的理论亮度差与实际测得的调制后的显 示设备中各个灰阶对应的亮度差的最大偏差可以通过下述公式进行计算：
Figure PCTCN2019105161-appb-000033
当然，计算获得的显示设备中各个灰阶对应的亮度差与实际测得的调制后的显示设备中各个灰阶对应的亮度差的最大偏差的方式并不局限于此。
作为示例，获得的显示设备中各个灰阶对应的亮度差与实际测得的调制后的显示设备中各个灰阶对应的亮度差的标准差可以为7.3％，其对应的获得的显示设备中各个灰阶对应的亮度差与实际测得的调制后的显示设备中各个灰阶对应的亮度差的最大偏差可以小于21％。
通过本公开实施例提供的显示设备的亮度-灰阶曲线的调制方法，通过获得的显示设备中各个灰阶对应的理论亮度值与实际测得的调制后的显示设备中各个灰阶对应的亮度值进行对比，和/或将获得的显示设备中各个灰阶对应的理论亮度差与实际测得的调制后的显示设备中各个灰阶对应的亮度差进行对比，可以定量地得到实际亮度与理想亮度的差异到底有多少，各个灰阶亮度梯度与理想亮度梯度的差异有多少，并且使得低灰阶区域不再是工程师调试过程中的盲区，从而可以精准地控制亮度的准确性以及亮度曲线的平滑性，即灰阶过度的平滑性。
图10是示出根据本公开实施例的显示设备的亮度-灰阶曲线的调制装置600的功能模块示意图。当在舒适环境下人眼感知亮度-灰阶应用标准曲线(对应的是L 感(n))确定为伽马曲线时，该调制装置600执行本公开上述实施例的调制方法。该显示设备的亮度-灰阶曲线的调制装置600运行于电子终端中。该显示设备的亮度-灰阶曲线的调制装置600可以包括第三获得模块610及调制模块620。
第三获得模块610，用于根据特定伽马曲线，获得显示设备中各个灰阶对应的理论亮度值。
作为示例，所述特定伽马曲线包括：
Figure PCTCN2019105161-appb-000034
Figure PCTCN2019105161-appb-000035
其中，L 物max为显示设备的最大亮度值，L 物min为显示设备的最小亮度值，n max为显示设备灰阶的最大值，n 0为中间因子，n为显示设备的各个灰阶，L 物(n)为显示设备的各个灰阶对应的理论亮度值。
作为示例，所述伽马参数的取值范围为2.0至2.4。
作为另一示例，所述伽马参数基于环境因子的值来确定。
具体的，所述伽马参数基于环境因子的值来确定包括：当环境因子的值的属于第一环境参数范围时，伽马曲线参数的值属于第一伽马曲线参数范围；当环境因子的值的属于第二环境参数范围时，伽马曲线参数的值属于第二伽马曲线参数范围；其中，第一环境参数范围内的值均大于第二环境参数范围内的值，第一伽马曲线参数范围内的值均小于第二伽马曲线参数范围内的值。
调制模块620，根据显示设备中各个灰阶对应的亮度值，对显示设备的亮度进行调制；其中，获得的显示设备中各个灰阶对应的理论亮度值与实际测得的调制后的显示设备中各个灰阶对应的亮度值的比值满足第一范围、和/或获得的显示设备中各个灰阶对应的理论亮度差与实际测得的调制后的显示设备中各个灰阶对应的亮度差的比值满足第二范围。
作为示例，所述调制模块，具体用于根据显示设备的各个灰阶对应的理论亮度值及人眼瞳孔变化的因子，对显示设备的亮度进行调制。
具体地，所述人眼瞳孔变化的因子包括与当前环境亮度下的人眼瞳孔的直径大小与预定义环境亮度下的人眼瞳孔的直径大小的比值相对应的值。
作为示例，所述第一范围包括1-15％至1+15％，所述第二范围包括1-30％至1+30％。
作为示例，获得的显示设备中各个灰阶对应的理论亮度值与实际测得的调制后的显示设备中各个灰阶对应的亮度值的标准差满足第三范围、或者获得的显示设备中各个灰阶对应的理论亮度值与实际测得的调制后的显示设备中各个灰阶对应的亮度值的最大偏差满足第四范围。
通过本公开实施例提供的显示设备的亮度-灰阶曲线的调制装置，通过获得的显示设备中各个灰阶对应的理论亮度值与实际测得的调制后的显示设备中各个灰阶对应的亮度值进行对比，和/或将获得的显示设备中各个灰阶对应的理论亮度差与实际测得的调制后的显示设备中各个灰阶对应的亮度差进行对比，可以定量地得到实际亮度与理想亮度的差异到底有多少，各个灰阶亮 度梯度与理想亮度梯度的差异有多少，并且使得低灰阶区域不再是工程师调试过程中的盲区，从而可以精准地控制亮度的准确性以及亮度曲线的平滑性，即灰阶过度的平滑性。
以上各个模块可以是由软件代码实现，也同样可以由硬件例如集成电路芯片实现。
请参阅图11，图11示出了根据本公开实施例的显示设备的亮度-灰阶曲线的调制方法的流程图，该方法包括：
步骤S711，确定人眼感知亮度-灰阶应用标准曲线。
作为示例，步骤S711可以包括：确定人眼感知亮度-灰阶绝对标准曲线；将人眼感知亮度-灰阶绝对标准曲线转换为人眼感知亮度-灰阶应用标准曲线。
对于人眼感知亮度-灰阶绝对标准曲线的确定方式，以及将人眼感知亮度-灰阶绝对标准曲线转换为人眼感知亮度-灰阶应用标准曲线的方式已经在前面进行描述，此处不再赘述。
其中，实测的人眼感知亮度-灰阶绝对标准曲线可以为幂函数曲线、对数曲线、感知量化曲线等，因此，转换后得到的该人眼感知亮度-灰阶应用标准曲线也可以为幂函数曲线、对数曲线、感知量化曲线等。其中，伽马曲线(如下所示)是一种幂函数曲线，杜比曲线(PQ曲线)是一种感知量化曲线，它们都可以作为人眼感知亮度-灰阶应用标准曲线的实施方式。
步骤S712，基于人眼瞳孔变化的因子、环境因子及与显示设备相关的因子中的至少一个以及该人眼感知亮度-灰阶应用标准曲线，获得显示设备中各个灰阶对应的理论亮度值。
作为示例，可以基于与显示设备相关的因子以及该人眼感知亮度-灰阶应用标准曲线，获得显示设备中各个灰阶对应的理论亮度值。
其中，所述与显示设备相关的因子可以包括显示设备的最大亮度值、显示设备的最小亮度值、显示设备灰阶的最大值、显示设备的各个灰阶。
具体地，当人眼感知亮度-灰阶应用标准曲线为伽马曲线时，可以参考上述实施例中的显示设备的亮度-灰阶曲线的调制方法的流程图及相关的描述来获得显示设备中各个灰阶对应的理论亮度值，此处不再赘述。
作为另一示例，可以基于环境因子、与显示设备相关的因子以及人眼感知亮度-灰阶应用标准曲线，获得显示设备中各个灰阶对应的理论亮度值。
具体地，当人眼感知亮度-灰阶应用标准曲线为伽马曲线时，可以参考上述实施例中的显示设备的亮度-灰阶曲线的调制方法中环境因子对人眼感知力的影响及其相关的描述，来获得显示设备中各个灰阶对应的理论亮度值，此处不再赘述。
作为又一示例，可以基于人眼瞳孔变化的因子及与显示设备相关的因子以及该人眼感知亮度-灰阶应用标准曲线，获得显示设备中各个灰阶对应的理论亮度值。
其中，所述人眼瞳孔变化的因子可以包括与当前环境亮度下的人眼瞳孔的直径大小与预定义环境亮度下的人眼瞳孔的直径大小的比值相对应的值。
具体地，当人眼感知亮度-灰阶应用标准曲线为杜比曲线(PQ曲线)，可以基于人眼瞳孔变化的因子、与显示设备相关的因子以及杜比曲线，获得显示设备中各个灰阶对应的理论亮度值。例如，可以根据下述示例进行计算。
【示例六】
对于按照PQ曲线进行调制的液晶显示面板，由于其曲线亮度是按照绝对亮度公式计算的，以PQ曲线为人眼感知亮度-灰阶应用标准曲线。
Figure PCTCN2019105161-appb-000036
Figure PCTCN2019105161-appb-000037
那么,在实际使用环境中,如果该环境是人眼的舒适区,那么显示设备的物理亮度曲线(对应显示设备中各个灰阶对应的亮度值)应为:
Figure PCTCN2019105161-appb-000038
Figure PCTCN2019105161-appb-000039
如果使用环境人眼的瞳孔直径变为
Figure PCTCN2019105161-appb-000040
那么显示设备的物理亮度曲线(对应显示设备中各个灰阶对应的亮度值)应为:
Figure PCTCN2019105161-appb-000041
Figure PCTCN2019105161-appb-000042
其中,L 物(n)为显示设备的各个灰阶对应的理论亮度值，v为视频信号，0<v<1，单位为伏特；m＝78.8438；p＝0.1593；C1＝0.8359；C2＝18.8516；C3＝18.6875；v 0为显示设备的信号噪声值，该v 0与显示设备的最小亮度值相 对应。当用灰阶n取代其中的模拟电压v时，可根据相关线性转换公式进行，并且进行归一化处理。
【示例七】
对于显示满足HEVC(High Efficiency Video Coding，高效视频编码)标准的视频的显示面板，以对数曲线为人眼感知亮度-灰阶应用标准曲线：
Figure PCTCN2019105161-appb-000043
其中，V是信号电源，L 感为相对亮度，取值范围为[0,1]，a＝0.17883277,b＝0.28466892,以及c＝0.55991073。
那么,在实际使用环境中,如果该环境是人眼的舒适区,那么显示设备的物理亮度曲线(对应显示设备中各个灰阶对应的理论亮度值)应为:
L 物(n)＝L 感(n)                          (43)
如果使用环境人眼的瞳孔直径变为
Figure PCTCN2019105161-appb-000044
那么显示设备的物理亮度曲线(对应显示设备中各个灰阶对应的理论亮度值)应为:
L 物(n)＝(Φ 0/Φ) 2*L 感(n)                      (44)
当然，可以理解的是，上述取值并不局限于此。
作为再一示例，可以基于人眼瞳孔变化的因子、环境因子及与显示设备相关的因子以及人眼感知亮度-灰阶应用标准曲线，获得显示设备中各个灰阶对应的理论亮度值。
具体地，当用伽马曲线近似代表人眼感知亮度-灰阶应用标准曲线时，可以参考上述实施例中的显示设备的亮度-灰阶曲线的调制方法中人眼瞳孔变化的因子对人眼感知力的影响及其相关的描述，获得显示设备中各个灰阶对应的理论亮度值，此处不再赘述。
步骤S713，根据显示设备中各个灰阶对应的理论亮度值，对显示设备的亮度进行调制。
作为一种详细示例，请参见图14，其具体内容已经在前文进行详细描述，此处不再赘述。
进一步的，在确定人眼感知亮度-灰阶应用标准曲线之前，所述方法还包括：接收拍摄端发送的各个灰阶，所述各个灰阶是拍摄端根据所述人眼感知亮度-灰阶应用标准曲线及所述拍摄图像的亮度确定；
在对显示设备的亮度进行调制之后，所述方法还包括：在显示设备上显示接收到的各个灰阶对应的亮度值。
在这种方式下，在拍摄端采用拍摄装置对图像进行拍摄，并利用拍摄装置或者单独的处理器根据所述人眼感知亮度-灰阶应用标准曲线及所述拍摄图像的亮度确定各个灰阶，并将该各个灰阶传输到显示设备端，由于在传输时只需传输该图像像素电对应的各个灰阶，可节省的传输量，在显示设备端通过调制后的显示设备接收该图像对应的各个灰阶，并利用调制后的显示设备的亮度-灰阶曲线来显示各个灰阶对应的亮度值，提供了一套完整的图像(或视频)信息的摄制、传输过程及显示标准体系结构，使用范围更广。通过本公开实施例提供的显示设备的亮度-灰阶曲线的调制方法，解决了采用理想伽马曲线对最低灰阶亮度不为零的液晶显示设备进行调制所造成的低灰阶细节不清，画面逆光化，高灰阶饱和及色彩过度不平滑等问题，并且考虑到环境因子对人眼感知力的影响，解决了采用理想伽马曲线调制对显示设备进行调制会造成在昏暗环节下的可见灰阶在明亮环境下不再能够区分的问题，而且提出了一种可量化的标准，弥补了显示领域中对于标准的空缺。
请参阅图12，图12是示出根据本公开实施例的显示设备的亮度-灰阶曲线的调制装置800的功能模块示意图。该显示设备的亮度-灰阶曲线的调制装置800运行于电子终端中。该显示设备的亮度-灰阶曲线的调制装置800可以包括：确定模块810、第四获得模块820及调制模块830。
确定模块810，用于确定人眼感知亮度-灰阶应用标准曲线。
具体地，该确定模块810具体用于确定人眼感知亮度-灰阶绝对标准曲线；将人眼感知亮度-灰阶绝对标准曲线转换为人眼感知亮度-灰阶应用标准曲线。
第四获得模块820，用于基于人眼瞳孔变化的因子、环境因子及与显示设备相关的因子中的至少一个以及该人眼感知亮度-灰阶应用标准曲线，获得显示设备中各个灰阶对应的理论亮度值。
作为示例，所述第四获得模块，用于基于与显示设备相关的因子以及该人眼感知亮度-灰阶应用标准曲线，获得显示设备中各个灰阶对应的理论亮度 值。
作为另一示例，所述第四获得模块，用于基于环境因子及与显示设备相关的因子以及该人眼感知亮度-灰阶应用标准曲线，获得显示设备中各个灰阶对应的理论亮度值。
作为又一种示例，所述第四获得模块，用于基于人眼瞳孔变化的因子、与显示设备相关的因子以及该人眼感知亮度-灰阶应用标准曲线，获得显示设备中各个灰阶对应的理论亮度值。
作为再一种示例，所述第四获得模块，用于基于人眼瞳孔变化的因子、环境因子、与显示设备相关的因子以及该人眼感知亮度-灰阶应用标准曲线，获得显示设备中各个灰阶对应的理论亮度值。
进一步的，作为示例，所述人眼瞳孔变化的因子包括与当前环境亮度下的人眼瞳孔的直径大小与预定义环境亮度下的人眼瞳孔的直径大小的比值相对应的值。
具体地，所述与显示设备相关的因子包括显示设备的最大亮度值、显示设备的最小亮度值、显示设备灰阶的最大值、显示设备的各个灰阶。
调制模块830，根据显示设备中各个灰阶对应的理论亮度值，对显示设备的亮度进行调制。
进一步的，所述装置还可以包括处理模块840(图中未示出)，用于在确定人眼感知亮度-灰阶应用标准曲线之前，接收拍摄端发送的各个灰阶，所述各个灰阶是拍摄端根据人眼感知亮度-灰阶应用标准曲线对拍摄图像的亮度获得；在对显示设备的亮度进行调制之后，在显示设备上显示接收到的各个灰阶对应的亮度值。
通过本公开实施例提供的显示设备的亮度-灰阶曲线的调制装置，解决了采用理想伽马曲线对显示设备进行调制所造成的低灰阶细节不清，画面逆光化，高灰阶饱和及色彩过度不平滑等问题，并且考虑到环境因子对人眼感知力的影响，解决了采用理想伽马曲线调制对显示设备进行调制会造成在昏暗环节下的可见灰阶在明亮环境下不再能够区分的问题，而且提出了一种可量化的标准，弥补了显示领域中对于标准的空缺。
以上各个模块可以是由软件代码实现，也同样可以由硬件例如集成电路芯片实现。
本公开实施例提供了一种电子设备，该电子设备包括显示设备、存储器和处理器，该处理器分别于该存储器与该显示设备耦合，该存储器中存储指令，当该指令由该处理器执行时以使该处理器执行上述方法的操作。
请参阅图13，图13示出了包括电子设备在内的实测环境图。其中，图中示出电子设备包括显示设备、存储器和处理器，电子设备被放置在支撑架上，并分别于电源、视频信号发生器、及光学测试设备耦合。其中，可以在电子设备的存储器中预先存储人眼感知亮度曲线L 感或者通过电子设备的处理器确定人眼感知亮度曲线L 感，并通过视频信号发生将视频信号输入(对应灰阶值)到电子设备中，首先获得该电子设备的显示设备的最大亮度值L 物max(对应灰阶值n＝n max)和显示设备的最小亮度值L 物min(对应灰阶值n＝0)，并通过不断的改变视频信号输入的灰阶值并结合人眼感知亮度曲线L 感实现对到显示设备各个灰阶对应的理论亮度值L 物(n)的调制，并通过光学测试设备获得实际测得的调制后的显示设备中各个灰阶对应的亮度值L 测(n)。
通过本公开实施例提供的电子设备，解决了采用理想伽马曲线对显示设备进行调制所造成的低灰阶细节不清，画面逆光化，高灰阶饱和及色彩过度不平滑等问题，并且考虑到环境因子对人眼感知力的影响，解决了采用理想伽马曲线调制对显示设备进行调制会造成在昏暗环节下的可见灰阶在明亮环境下不再能够区分的问题，而且提出了一种可量化的标准，弥补了显示领域中对于标准的空缺。
需要说明的是，本说明书中的各个实施例均采用递进的方式描述，每个实施例重点说明的都是与其他实施例的不同之处，各个实施例之间相同相似的部分互相参见即可。
本公开实施例所提供的显示设备的亮度-灰阶曲线的调制装置，其实现原理及产生的技术效果和前述方法实施例相同，为简要描述，装置实施例部分未提及之处，可参考前述方法实施例中相应内容。
在本申请所提供的几个实施例中，应该理解到，所揭露的装置和方法，也可以通过其它的方式实现。以上所描述的装置实施例仅仅是示意性的，例如，附图中的流程图和框图显示了根据本公开的多个实施例的装置、方法和计算机程序产品的可能实现的体系架构、功能和操作。在这点上，流程图或框图中的每个方框可以代表一个模块、程序段或代码的一部分，该模块、程 序段或代码的一部分包含一个或多个用于实现规定的逻辑功能的可执行指令。也应当注意，在有些作为替换的实现方式中，方框中所标注的功能也可以以不同于附图中所标注的顺序发生。例如，两个连续的方框实际上可以基本并行地执行，它们有时也可以按相反的顺序执行，这依所涉及的功能而定。也要注意的是，框图和/或流程图中的每个方框、以及框图和/或流程图中的方框的组合，可以用执行规定的功能或动作的专用的基于硬件的系统来实现，或者可以用专用硬件与计算机指令的组合来实现。
另外，在本公开各个实施例中的各个功能模块可以集成在一起形成一个独立的部分，也可以是各个模块单独存在，也可以两个或两个以上模块集成形成一个独立的部分。
所述功能如果以软件功能模块的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本公开的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本公开各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各个种可以存储程序代码的介质。需要说明的是，在本文中，诸如第一和第三等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。
以上所述仅为本公开的实施例而已，并不用于限制本公开，对于本领域的技术人员来说，本公开可以有各个种更改和变化。凡在本公开的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本公开的保护范 围之内。应注意到：相似的标号和字母在下面的附图中表示类似项，因此，一旦某一项在一个附图中被定义，则在随后的附图中不需要对其进行进一步定义和解释。
以上所述，仅为本公开的具体实施方式，但本公开的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本公开揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本公开的保护范围之内。因此，本公开的保护范围应以所附权利要求及其等同物的保护范围为准。

Claims (16)

  1. 一种显示设备的亮度-灰阶曲线的调制方法，包括：
    根据显示设备的最大亮度值、显示设备的最小亮度值、显示设备灰阶的最大值、与显示环境相关的伽马参数，获得显示设备的各个灰阶对应的理论亮度值；
    根据显示设备的各个灰阶对应的理论亮度值，对显示设备的亮度进行调制。
  2. 根据权利要求1中所述的方法，其中，根据显示设备的最大亮度值、显示设备的最小亮度值、显示设备灰阶的最大值、与显示环境相关的伽马参数，获得显示设备的各个灰阶对应的理论亮度值包括：
    根据显示设备的最大亮度值、显示设备的最小亮度值、显示设备灰阶的最大值及与显示环境相关的伽马参数，获得中间因子；
    根据显示设备的最大亮度值、显示设备灰阶的最大值、及中间因子，获得显示设备的各个灰阶对应的理论亮度值。
  3. 根据权利要求1中所述的方法，其中，根据显示设备的最大亮度值、显示设备的最小亮度值、显示设备灰阶的最大值、与显示环境相关的伽马参数，获得显示设备的各个灰阶对应的理论亮度值包括：
    根据显示设备的最大亮度值、显示设备的最小亮度值、显示设备灰阶的最大值、与显示环境相关的伽马参数确定特定伽马曲线；
    根据所述特定伽马曲线，获得显示设备的各个灰阶对应的理论亮度值，
    其中，所述特定伽马曲线的中间因子是根据显示设备的最大亮度值、显示设备的最小亮度值、显示设备灰阶的最大值及与显示环境相关的伽马参数确定的。
  4. 根据权利要求2或3中所述的方法，其中，
    根据下式确定所述中间因子：
    Figure PCTCN2019105161-appb-100001
    其中，L 物max为显示设备的最大亮度值，L 物min为显示设备的最小亮度值，n max为显示设备灰阶的最大值，γ为与显示环境相关的伽马参数，n 0为中间因子。
  5. 根据权利要求4中所述的方法，其中，根据下式获得显示设备的各个灰阶对应的理论亮度值：
    Figure PCTCN2019105161-appb-100002
    其中，L 物max为显示设备的最大亮度值，n max为显示设备灰阶的最大值，n 0为中间因子，n为显示设备的各个灰阶，L 物(n)为显示设备的各个灰阶对应的理论亮度值，γ为与显示环境相关的伽马参数。
  6. 根据权利要求1-5中任一项所述的方法中，其中，所述伽马参数基于环境因子的值来确定。
  7. 根据权利要求1-5中任一项所述的方法中，其中，至少根据显示设备的各个灰阶对应的理论亮度值，对显示设备的亮度进行调制，包括：
    根据显示设备的各个灰阶对应的理论亮度值及人眼瞳孔变化的因子，对显示设备的亮度进行调制。
  8. 根据权利要求7中所述的方法中，其中，所述人眼瞳孔变化的因子包括与当前环境亮度下的人眼瞳孔的直径大小与预定义环境亮度下的人眼瞳孔的直径大小的比值相对应的值。
  9. 根据权利要求1-8中任一项所述的方法，其中，获得的显示设备中各个灰阶对应的理论亮度值与实际测得的调制后的显示设备中各个灰阶对应的亮度值的比值满足第一范围、和/或获得的显示设备中各个灰阶对应的理论亮度差与实际测得的调制后的显示设备中各个灰阶对应的亮度差的比值满足第 二范围。
  10. 根据权利要求1-9中任一项所述的方法，其特征在于，获得的显示设备中各个灰阶对应的理论亮度值与实际测得的调制后的显示设备中各个灰阶对应的亮度值的标准差满足第三范围、或者获得的显示设备中各个灰阶对应的理论亮度值与实际测得的调制后的显示设备中各个灰阶对应的亮度值的最大偏差满足第四范围。
  11. 一种显示设备的亮度-灰阶曲线的调制方法，包括：
    确定人眼感知亮度-灰阶应用标准曲线；
    基于人眼瞳孔变化的因子、环境因子及与显示设备相关的因子中的至少一个以及所述人眼感知亮度-灰阶应用标准曲线，获得显示设备中各个灰阶对应的理论亮度值；
    根据显示设备中各个灰阶对应的理论亮度值，对显示设备的亮度进行调制。
  12. 根据权利要求11所述的方法，其中，基于人眼瞳孔变化的因子、环境因子及与显示设备相关的因子中的至少一个以及所述人眼感知亮度-灰阶应用标准曲线，获得显示设备中各个灰阶对应的理论亮度值，包括：
    基于人眼瞳孔变化的因子、与显示设备相关的因子以及所述人眼感知亮度-灰阶应用标准曲线，获得显示设备中各个灰阶对应的理论亮度值。
  13. 根据权利要求12所述的方法，其中，与显示设备相关的因子包括显示设备的最小亮度值，基于人眼瞳孔变化的因子、与显示设备相关的因子以及所述人眼感知亮度-灰阶应用标准曲线，获得显示设备中各个灰阶对应的理论亮度值，包括：
    按照公式
    Figure PCTCN2019105161-appb-100003
    或
    按照公式
    Figure PCTCN2019105161-appb-100004
    确定所述理论亮度值；
    其中,L 物(n)为显示设备的各个灰阶对应的理论亮度值，v为视频信号， 0<v<1，单位为伏特；m＝78.8438；p＝0.1593；C1＝0.8359；C2＝18.8516；C3＝18.6875；v 0为显示设备的信号噪声值，该v 0与显示设备的最小亮度值相对应。
  14. 根据权利要求11所述的方法，其中，基于人眼瞳孔变化的因子、环境因子及与显示设备相关的因子中的至少一个以及所述人眼感知亮度-灰阶应用标准曲线，获得显示设备中各个灰阶对应的理论亮度值，包括：
    按照公式L 物(n)＝(Φ 0/Φ) 2*L 感(n)或
    按照公式L 物(n)＝L 感(n)确定所述理论亮度值；
    其中，L 感(n)为人眼感知亮度-灰阶应用标准曲线并满足下述公式：
    Figure PCTCN2019105161-appb-100005
    其中，V是信号电源，L 感(n)为人眼感知亮度-灰阶应用标准曲线，其取值范围为[0,1]，a＝0.17883277,b＝0.28466892,以及c＝0.55991073。
  15. 一种电子设备，所述电子设备包括显示设备、存储器和处理器，所述处理器分别于所述存储器与所述显示设备耦合，所述存储器中存储指令，当所述指令由所述处理器执行时以使所述处理器执行权利要求1-14中任一所述的调制方法。
  16. 一种非瞬时性计算机可读记录介质，其上已记录用于执行权利要求1-14中任一所述的调制方法的程序。
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