WO2019200529A1 - Procédé et appareil de traitement d'image, et dispositif électronique - Google Patents

Procédé et appareil de traitement d'image, et dispositif électronique Download PDF

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Publication number
WO2019200529A1
WO2019200529A1 PCT/CN2018/083362 CN2018083362W WO2019200529A1 WO 2019200529 A1 WO2019200529 A1 WO 2019200529A1 CN 2018083362 W CN2018083362 W CN 2018083362W WO 2019200529 A1 WO2019200529 A1 WO 2019200529A1
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Prior art keywords
pixel
pixel value
fingerprint
light intensity
test
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PCT/CN2018/083362
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English (en)
Chinese (zh)
Inventor
程雷刚
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Shenzhen Goodix Technology Co Ltd
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Shenzhen Goodix Technology Co Ltd
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Priority to CN201880000380.5A priority Critical patent/CN108496184B/zh
Priority to PCT/CN2018/083362 priority patent/WO2019200529A1/fr
Publication of WO2019200529A1 publication Critical patent/WO2019200529A1/fr
Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing

Definitions

  • the embodiments of the present application relate to identification technologies, and in particular, to an image processing method, apparatus, and electronic device.
  • the display screen of electronic devices has gradually developed to a comprehensive screen, and the higher and higher screen ratio, which makes the current mainstream capacitive fingerprint module nowhere to be placed.
  • the on-screen optical fingerprinting scheme can place the fingerprint sensor on the back of the display screen without occupying the area of the non-display area, thereby effectively increasing the screen ratio.
  • the light with the fingerprint information needs to penetrate the display screen to reach the fingerprint sensor, form a fingerprint image on the surface of the fingerprint sensor, and then perform fingerprint recognition based on the fingerprint image.
  • the embodiment of the present application provides an image processing method, device, and electronic device to improve the accuracy and accuracy of fingerprint recognition.
  • the embodiment of the present application provides an image processing method, which is applied to an electronic device having fingerprint identification, the electronic device includes: a display screen and a fingerprint sensor; the fingerprint sensor is located below the display screen, and the fingerprint sensor includes a plurality of pixels, the method comprising:
  • An embodiment of the present application further provides an image processing apparatus, which is applied to an electronic device having fingerprint identification, the electronic device comprising: a display screen and a fingerprint sensor located below the display screen; the fingerprint sensor includes a plurality of pixels Point, the device comprises:
  • a determining module configured to determine a linear relationship between an output pixel value of each pixel of the fingerprint sensor and an incident light intensity
  • An acquisition module configured to: when a finger is pressed, collect a fingerprint pixel value output by each pixel at a first light intensity
  • a calibration module configured to calibrate the fingerprint pixel value according to the linear relationship to obtain a fingerprint image.
  • the embodiment of the present application further provides an electronic device, including: a display screen and a fingerprint sensor located below the display screen; the fingerprint sensor includes a plurality of pixel points, and the electronic device further includes: a memory and a processor; the display screen, the fingerprint sensor, and the memory are respectively connected to the processor through a bus;
  • the memory is configured to store program instructions
  • the processor is configured to execute the image processing method when the program instruction stored in the memory is called.
  • the embodiment of the present application further provides a computer readable storage medium, where the storage medium stores a computer program, and the computer program is implemented by a processor to implement the image processing method described above.
  • the image processing method, device and electronic device can determine the linear relationship between the output pixel value of each pixel point of the fingerprint sensor and the incident light intensity, and when the finger is pressed, the pixel is collected.
  • the fingerprint pixel value outputted under the first light intensity is calibrated according to a linear relationship to obtain a fingerprint image. Since the linear relationship between the output pixel value and the incident light intensity obtained from the test pixel value can be used to characterize the photographic performance difference and the optical path difference of each pixel point, the method determines the output pixel value of each pixel point according to the method.
  • the linear relationship between the intensity and the incident light intensity calibrates the fingerprint pixel value, which can effectively reduce the interference of the pixel difference between the pixel difference and the optical path difference, improve the sharpness of the fingerprint image, and improve the accuracy of the fingerprint recognition. Accuracy.
  • 1A is a schematic layer diagram of implementing an optical fingerprint on a screen in an AMOLED hard display provided by an embodiment of the present application;
  • FIG. 1B is a schematic diagram of reflected light when a surface of an AMOLED hard display screen is not pressed by a finger according to an embodiment of the present application;
  • 1C is a schematic diagram of reflected light when a surface of an AMOLED hard display screen is pressed by a finger according to an embodiment of the present application;
  • FIG. 2A is a flowchart of an image processing method according to an embodiment of the present application.
  • 2B is a schematic diagram of photographic performance and optical path difference of each pixel in a fingerprint sensor according to an embodiment of the present disclosure
  • 2C is a schematic layer diagram of collecting pixel values when a test unit is pressed in an AMOLED hard display according to an embodiment of the present application;
  • FIG. 3 is a flowchart of another image processing method according to an embodiment of the present application.
  • FIG. 5 is a schematic structural diagram of an image processing apparatus according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
  • the image processing method, device, electronic device and storage medium provided by the following embodiments of the present application can be applied to any electronic device having a screen optical fingerprint recognition function, such as a smart phone, a notebook computer, a wearable device, and a home appliance.
  • the under-screen optical fingerprint can be partially implemented in the display area of the display screen or in full screen.
  • the active-Matrix Organic Light Emitting Diode (AMOLED) hard display is taken as an example to illustrate the implementation of the optical fingerprint under the screen.
  • Other types of displays such as organic light-emitting diodes (such as organic light-emitting diodes)
  • OLED Organic Light-Emitting Diode
  • LCD liquid crystal display
  • FIG. 1A is a schematic stacked diagram of implementing an under-screen optical fingerprint in an AMOLED hard display according to an embodiment of the present application.
  • the AMOLED display panel includes: a substrate glass, a display pixel, a sealing glass, a Touch Plane (TP) layer, and a cover glass.
  • Various organic materials are distilled on the substrate glass to form display pixels, and then sealed by using sealing glass, and the substrate glass, the sealing glass and the laminated display driving circuit between them realize the display function of the display screen.
  • the upper surface of the sealing glass is coated with a conductive material to form a TP layer.
  • the conductive material may be, for example, Indium Tin Oxide (ITO), metal, or the like.
  • the conductive material of the TP layer can also be applied to the surface of the film, which is attached to the surface of the sealing glass.
  • the TP layer can also be other structural forms, and details are not described herein again.
  • the TP layer cooperates with the touch driving circuit to realize the touch function of the display screen.
  • the TP layer is etched into various patterns.
  • the AMOLED hard display is also provided with a circular polarizer to suppress the reflection of the display screen to ambient light, achieving higher display contrast, and the circular polarizer is located between the TP layer and the cover glass.
  • the TP layer is bonded to the circular polarizer by a transparent optical adhesive (OCA), and the circular polarizer is bonded to the cover glass through the OCA.
  • OCA transparent optical adhesive
  • FIG. 1A is only one example of the structure of each stack in the AMOLED hard display.
  • the structure of each stack of the AMOLED hard display may be other forms. This will not be repeated here.
  • the on-screen optical fingerprinting scheme can also be implemented in the AMOLED flexible display screen, and the laminated structure of the AMOLED flexible display screen is similar to the structure of FIG. 1A, except that in the AMOLED flexible display screen, flexible is available due to the folding requirement.
  • the substrate glass shown in FIG. 1A above may be replaced with a substrate film
  • the sealing glass may be replaced with a sealing film.
  • a fingerprint sensor can be located below the substrate glass.
  • the fingerprint sensor is also called an optical fingerprint sensor.
  • the fingerprint sensor can be placed or attached to the lower surface of the substrate glass.
  • the light source may be any display source such as a display pixel of an OLED display, a surface light source of an LCD display, or a light-emitting diode (LED) external to the display screen.
  • the reflectivity of the interface is determined by the refractive index of the material laminated on both sides of the interface.
  • the refractive index of glass is usually 1.5
  • the refractive index of ITO is 1.8
  • the refractive index of air is 1
  • the refractive index of OCA, circular polarizer, and finger is about 1.4.
  • the vertical reflectivity of the interface between the two media can be determined according to the vertical reflectivity formula at the interface of the two layers of media.
  • the vertical reflectance formula at the interface of the two layers of media is as follows (1):
  • R is the vertical reflectivity at the interface
  • n 1 and n 2 represent the refractive indices of the media on both sides of the interface, respectively.
  • the vertical reflectance of the interface between the glass and the air can be 4%
  • the vertical reflectance of the interface between the glass and the finger can be 0.12%.
  • the vertical reflectance of the interface between the glass and the air may be a first value due to the difference in the material of the glass, the individual difference of the fingers, etc., and the difference between the first value and 4% may be within a preset range.
  • the vertical reflectivity of the interface between the glass and the finger may also be a second value, and the difference between the second value and 0.12% may be within a preset range.
  • FIG. 1B is a schematic diagram of reflected light when a surface of an AMOLED hard display screen is not pressed by a finger according to an embodiment of the present invention
  • FIG. 1C is a schematic diagram of reflected light when a surface of an AMOLED hard display screen is pressed by a finger according to an embodiment of the present disclosure
  • the finger ridge line is in contact with the glass, but air remains in the finger valley line, and the light is both in the glass and the finger ridge line.
  • the interface reflection can also be reflected at the interface between the glass and the finger valley line (air), wherein the vertical reflectance of the interface between the glass and the finger ridge line is 0.12%, and the vertical reflection of the interface between the glass and the finger valley line
  • the rate can be 4%.
  • P FP stands for pure fingerprint information.
  • a screen protector (not shown in the drawing) may be attached to the cover glass, such that when the finger is pressed, the reflected light on the upper surface of the protective film may carry fingerprint information.
  • the specific implementation of the on-screen optical fingerprinting scheme is similar to the specific implementation of the under-screen optical fingerprinting scheme of the display screen without the screen protective film, and details are not described herein again.
  • Reflected light on the upper surface of the cover glass, finger reflection light, etc. carry fingerprint information.
  • the stacks of light-transmitting display screens carrying the fingerprint information are incident on the fingerprint sensor disposed on the lower layer of the substrate glass together with the reflected light inside the display screen, and then the pixel values output by the fingerprint sensor are processed. Thereby, a fingerprint image, that is, fingerprint information to be extracted is obtained.
  • the deviation of the chip manufacturing process makes it impossible to completely match the electrical characteristics between the pixel points of the fingerprint sensor. Therefore, there may be a difference in photographic performance between pixels of the fingerprint sensor.
  • the illuminating pixel points and the metal traces in the display pixel layer are not completely transparent, the light above the display pixel layer passes through the display pixel layer, and part of the light is blocked, which causes each pixel of the fingerprint sensor located under the display display screen.
  • the light paths of the dots are different, so that there is a difference in optical path between the pixels of the fingerprint sensor.
  • the following embodiments of the present application can perform the calibration process on the pixel values output by the fingerprint sensor, thereby effectively reducing the sensitivity of the pixel point and the interference of the optical path difference on the fingerprint image formation, so that the obtained fingerprint image is more Accurate and effectively improve the accuracy and accuracy of fingerprint recognition.
  • the image processing method can be applied to an electronic device having fingerprint recognition, the electronic device comprising: a display screen and a fingerprint sensor.
  • the fingerprint sensor can be located below the display screen, and the fingerprint sensor includes a plurality of pixel points.
  • the method may be implemented by software of the electronic device by means of software and/or hardware, or by other processors connected to the fingerprint sensor, such as a calibration processor, by software and/or hardware.
  • the image processing method can be performed during the process of calibrating the display module of the electronic device or the electronic device or during calibration of the user using the fingerprint application. As shown in FIG. 2A, the method can include:
  • a linear fit is performed by using a test pixel value outputted by the pixel at the at least one light intensity to obtain a linear relationship between the output pixel value of each pixel point and the incident light intensity.
  • FIG. 2B is a schematic diagram of photographic performance and optical path difference of each pixel in a fingerprint sensor according to an embodiment of the present disclosure.
  • a uniform light source is placed above the fingerprint sensor, and each pixel receives light of the same light intensity, but the output raw data of the pixel is inconsistent, and the pixel raw data output by each pixel point is still linear with the received light intensity.
  • the relationship between the pixel raw data outputted by the nth pixel and the received light intensity can be expressed as Where R n is the pixel raw data output by the nth pixel point, The linear slope of the pixel raw data and the received light intensity output for the nth pixel, The received light intensity for the nth pixel, The linear intercept of the pixel raw data and the received light intensity output for the nth pixel. with Can be used to characterize the difference in photographic performance of the nth pixel.
  • the illuminating pixel points and the metal traces in the display pixel layer are not completely transparent, the light above the display pixel layer passes through the display pixel layer, and part of the light is blocked.
  • a uniform light source is placed above the display pixel layer. After the display pixel layer is partially blocked, the light intensity received by each pixel of the fingerprint sensor is inconsistent, but each pixel of the fingerprint sensor is inconsistent.
  • the received light intensity is still linear with the incident light intensity of each pixel, and the relationship between the received light intensity of the nth pixel and the incident light intensity can be expressed as among them,
  • the received light intensity for the nth pixel Is the linear slope of the received light intensity and incident light intensity at the nth pixel point,
  • the incident light intensity at the nth pixel point Is the linear slope of the received light intensity and incident light intensity at the nth pixel point.
  • the incident light at each pixel point refers to light corresponding to each pixel point above the display pixel layer.
  • the incident light intensity of each pixel of the fingerprint sensor is zero
  • the received light intensity of each pixel of the fingerprint sensor is also zero. Therefore, the relationship between the pixel raw data outputted by the nth pixel and the incident light intensity can be expressed as among them,
  • the linear slope of the original pixel data and the incident light intensity output for the nth pixel point, b n is the linear intercept of the original pixel data output from the nth pixel point and the incident light intensity.
  • k n can be used to characterize the difference in photographic performance and optical path difference at the nth pixel
  • b n can be used to characterize the difference in photographic performance of the nth pixel.
  • determining a linear relationship between the output pixel value of each pixel point and the incident light intensity may be determining a difference in photographic performance and an optical path difference of each pixel point of the fingerprint sensor. That is to say, the linear relationship may include: sensitivity difference of each pixel point of the fingerprint sensor and parameter information of the optical path difference.
  • the first light intensity may be the same as or different from the light intensity at which the test pixel values are acquired.
  • the fingerprint pixel value of all the pixel points of the fingerprint sensor at the first light intensity can be obtained by performing the S202.
  • the fingerprint pixel value outputted by the pixel at the first light intensity may be represented by pixel raw data output by the pixel at the first light intensity when pressed by a finger.
  • the fingerprint pixel value outputted by the nth pixel of the fingerprint sensor at the first light intensity i can be expressed by the following formula (2).
  • the fingerprint pixel value output at the nth pixel point of the fingerprint sensor at the first light intensity i when pressed by the finger To reflect light inside the screen corresponding to the nth pixel point at the first light intensity i, Reflecting light on the upper surface of the cover glass corresponding to the nth pixel point at the first light intensity i, In order to reflect the light corresponding to the finger corresponding to the nth pixel point at the first light intensity i, k n is the difference in the photosensitive performance of the nth pixel point and the optical path difference, and b n is the difference in the photosensitive performance of the nth pixel point. among them With strong fingerprint information, With weak fingerprint information, Pattern information with each laminate inside the screen.
  • the fingerprint information is interfered by factors such as the difference in the photographic performance of each pixel, the optical path difference of each pixel, and the reflected light pattern information inside the screen.
  • the fingerprint pixel value needs to be calibrated according to the linear relationship to obtain a fingerprint image, and each pixel of the fingerprint sensor is reduced. Differences in photographic performance and interference from optical path differences.
  • the image processing method provided by the embodiment of the present application can determine the linear relationship between the output pixel value of each pixel point of the fingerprint sensor and the incident light intensity.
  • the pixel is collected at the first light intensity.
  • the fingerprint pixel value outputted is calibrated according to the linear relationship to obtain a fingerprint image. Since the linear relationship between the output pixel value and the incident light intensity obtained from the test pixel value can be used to characterize the photographic performance difference and the optical path difference of each pixel point, the method determines the output pixel value of each pixel point according to the method.
  • the linear relationship between the intensity and the incident light intensity calibrates the fingerprint pixel value, which can effectively reduce the interference of the pixel difference between the pixel difference and the optical path difference, improve the sharpness of the fingerprint image, and improve the accuracy of the fingerprint recognition. Accuracy.
  • the test unit when the test unit is pressed, the test pixel value outputted by each pixel at at least one light intensity is collected, and then linearly fitted according to the test pixel value, thereby obtaining the A first linear relationship between the output pixel value of each pixel and the incident light intensity.
  • test unit when the test unit is used for pressing, the test unit can be pressed on the upper surface of the display screen, such as the upper surface of the cover glass of the display screen, and each pixel of the fingerprint sensor is outputted under at least one light intensity. Test pixel value.
  • the test unit can be a test probe, also called a test head.
  • FIG. 2C is a schematic stacked diagram of collecting pixel values when a test unit is pressed in an AMOLED hard display provided by an embodiment of the present application. 2C differs from FIG. 1A described above in that, in the drawing shown in FIG. 2C, a test unit is pressed against the cover glass. When the test unit is pressed on the upper surface of the cover glass, when the light source is lit, the light emitted by the light source propagates upward, and is sequentially reflected by the laminate of sealing glass, TP layer, OCA glue, circular polarizer, cover glass, etc. to the test unit.
  • the light source may be any display source such as a display pixel of an OLED display, a surface light source of an LCD display, or a light-emitting diode (LED) external to the display screen.
  • all operations in the text to change the light intensity may include: changing the exposure time of the fingerprint sensor. For example, increasing the light intensity can increase the exposure time of the fingerprint sensor. If the light source is turned off, that is, the light intensity is zero, the exposure time of the fingerprint sensor can be set to zero.
  • changing the exposure time of the fingerprint sensor For example, increasing the light intensity can increase the exposure time of the fingerprint sensor. If the light source is turned off, that is, the light intensity is zero, the exposure time of the fingerprint sensor can be set to zero.
  • test unit if the test unit is pressed against the upper surface of the display screen, such as the upper surface of the cover glass of the display screen, the test pixel value output by each pixel of the fingerprint sensor at at least one light intensity is acquired.
  • a light intensity may correspond to a light intensity gear, and the at least one light intensity may be at least one light source light intensity, which respectively correspond to different light intensity gear positions.
  • the at least one light intensity can include two light intensities, for example, the brightness of the display screen is the brightest and the two light intensities when extinguished.
  • the test pixel value output by each pixel at each light intensity can be represented by pixel raw data (Rawdata) output by each pixel at each light intensity.
  • test unit as referred to above may be implemented by one test unit or by two or more test units. Whether it includes several test units, each test unit needs to be able to uniformly reflect the outgoing light of the light source. That is to say, the surface of each test unit is flat, which can uniformly reflect light.
  • test unit includes a test unit, when the test unit is pressed, the test pixel value outputted by each pixel at a plurality of light intensities is collected. If the test unit comprises a plurality of test pixels, the test pixel value of each pixel at at least one light intensity is collected when each test unit is pressed.
  • the surface of the test unit when the test unit is pressed, can be hollowed out, so that the test unit faces the display screen with a concave surface to effectively prevent the test unit from being covered by the display screen. Pattern interference caused by uneven contact between the plates.
  • the test unit when the test unit is pressed on the cover glass of the display screen, the external ambient light outside the display screen can be effectively shielded. Since the test unit needs to shield the ambient light, each test unit needs to be a non-transparent test unit, regardless of the number of test units required.
  • the test unit can include: a test unit, such as a first test unit.
  • the first test unit may be a flat test head of flesh-colored or other colors.
  • the reflectivity of the first test unit is better than that of most of the fingers.
  • the material of the first test unit may be silica gel, glass, or film. (Film), metal, etc., and the first test unit needs to be able to shield the ambient light.
  • test unit includes a test unit, taking the first test unit as an example, determining a linear relationship between the output pixel value of each pixel of the fingerprint sensor and the incident light intensity in S201 in the above method may include:
  • a linear relationship between the output pixel value of each pixel point and the incident light intensity is determined according to the first test pixel value.
  • the incident light of the nth pixel of the fingerprint sensor at the mth light intensity may include: the internal reflection light of the screen corresponding to the nth pixel point of the mth light intensity Reflected light on the upper surface of the cover glass corresponding to the nth pixel point at the mth light intensity
  • the reflected light of the first test unit corresponding to the nth pixel point at the mth light intensity Therefore, when the first test unit is pressed, the first test pixel value outputted by the nth pixel of the fingerprint sensor under the M light intensity can be expressed by the following formula (3).
  • the first test pixel value output by the nth pixel of the fingerprint sensor at the mth light intensity when the first test unit is pressed Including the surface reflected light of the first test unit and the internal diffused light, Carrying the pattern information of each laminate inside the display, obviously with Both have a linear relationship with the light source intensity that is approximately zero-crossing, and the reflected light is zero when the light source intensity is zero.
  • the intensity of the pattern information carried is also a linear relationship with the light source intensity that is approximately zero crossing.
  • the first test pixel value outputted under a plurality of light intensities of each pixel is linearly fitted, such as a least squares linear fit, and the output pixel value and incidence of each pixel are determined.
  • the linear relationship between light intensities can also be other fitting manners, and details are not described herein again.
  • the linear relationship between the output pixel value of each pixel and the incident light intensity includes: a linear slope and a linear intercept; the linear slope is a linear slope of the output pixel value of each pixel and the incident light intensity The linear intercept is a linear intercept of the output pixel value of each pixel point and the incident light intensity.
  • the consistency of Pixel for all pixels can be guaranteed by controlling the cleanliness of the upper surface of the cover glass.
  • the consistency of Pixel for all pixels can be guaranteed by controlling the flatness and cleanliness of the first test unit 1, but Carrying the pattern information of each layer inside the display screen, such as the pattern information of the TP layer, it is impossible to make all Pixel pixel points consistent, so Inconsistency for all pixels Therefore, the above formula (3) can be transformed to obtain the following formula (4).
  • k n can be used to indicate the difference in photographic performance and optical path difference of each pixel of the fingerprint sensor. It can be used to indicate information such as the upper surface of the cover glass of the display or the dirty scratches indicated by the first test unit or the second test unit.
  • K' n is a linear slope, which not only indicates the difference in photographic performance and optical path difference of each pixel of the fingerprint sensor, but also indicates the upper surface of the cover glass of the display screen or the dirty scratch indicated by the first test unit or the second test unit.
  • b' n b n
  • b' n is a linear intercept, which can indicate the difference in photographic performance of each pixel of the fingerprint sensor.
  • N is the number of pixels of the fingerprint sensor.
  • the fingerprint pixel value output by the nth pixel of the fingerprint sensor at the first light intensity i can be expressed by the above formula (2) when the finger is pressed.
  • a linear fitting is performed by taking the least squares method as an example.
  • other linear fitting methods may be used to obtain the linear slope and the linear intercept.
  • the nth pixel When the finger is not pressed, the nth pixel reflects light on the surface of the corresponding cover glass under the first light intensity i without fingerprint information; When pressed for a finger, the nth pixel point reflects light on the upper surface of the corresponding cover glass under the first light intensity i, with fingerprint information; For finger pressing, the nth pixel points correspond to the fingerprint information at the first light intensity i.
  • the obtained fingerprint image is not interfered by the difference of the photosensitive pixels and the optical path difference of each pixel, thereby improving the definition of the fingerprint image and improving the accuracy and accuracy of the fingerprint recognition.
  • the application can also provide an image processing method.
  • the image processing method is a possible example of the image processing method in the case of a test unit described in the above embodiment.
  • FIG. 3 is a flowchart of another image processing method according to an embodiment of the present application. As shown in FIG. 3, the method can include:
  • the first test pixel value outputted by each of the pixel points under the M light intensity may be represented by the above formula (3), which may be: M is an integer greater than or equal to 2.
  • the reflectance of the first test unit is better than that of most of the fingers.
  • the fingerprint pixel value outputted by each pixel at the light intensity i can be expressed by the above formula (2),
  • the fingerprint pixel value can be based on the linear slope k' n and the linear intercept b' n Perform calibration to obtain a fingerprint image P, where
  • the embodiment provides a method for calibrating the fingerprint pixel value according to the determined linear relationship between the output pixel value of each pixel and the incident light intensity in a test unit, thereby effectively reducing the sensitivity of each pixel point.
  • the difference between the difference and the optical path difference on the fingerprint pixel value improve the sharpness of the fingerprint image, and improve the accuracy and accuracy of fingerprint recognition.
  • the test unit can include a first test unit and a second test unit.
  • the first test unit may be a flesh-colored or other color flat test head.
  • the reflectivity of the first test unit is better than that of most of the fingers.
  • the material of the first test unit may be silica gel, glass, or film. , metal, etc., and the first test unit needs to be able to shield ambient light.
  • the second test unit may be a flat test head of black or other color, and the emissivity of the second test unit is better than that of most of the fingers, since the reflectance of the first test unit is greater than that of most of the fingers. The reflectivity, therefore, the reflectivity of the second test unit is also less than the reflectivity of the first test unit.
  • the material of the second test unit may also be silica gel, glass, film, metal, etc., and the second test unit needs to be able to shield ambient light.
  • the second test unit can be, for example, a black box, a black cover, or the like.
  • test unit Since the test unit needs to shield the ambient light, it is a non-transparent test unit regardless of the first test unit or the second test unit.
  • determining a linear relationship between the output pixel value of each pixel of the fingerprint sensor and the incident light intensity in S201 in the above method may include:
  • the implementation of acquiring the first test pixel value is similar to the above process including one test unit, except that in the example, the light intensity required when the first test unit is pressed is collected.
  • the number M is greater than or equal to 1.
  • the incident light of the nth pixel of the fingerprint sensor at the mth light intensity may include: the internal reflection light of the screen corresponding to the nth pixel point of the mth light intensity Reflected light on the upper surface of the cover glass corresponding to the nth pixel point at the mth light intensity
  • the reflected light of the second test unit corresponding to the nth pixel point under the mth light intensity Therefore, when the second test unit is pressed, the second test pixel value outputted by the nth pixel of the fingerprint sensor under the M light intensity can be expressed by the following formula (7).
  • the second test pixel value output by the nth pixel of the fingerprint sensor at the mth light intensity when the second test unit is pressed Including the surface reflected light of the second test unit and the internal diffused light, Carrying the pattern information of each laminate inside the display, obviously with Both are linear with the light source intensity, and the reflected light is also zero when the light source intensity is zero.
  • the intensity of the pattern information carried is also a linear relationship with the light source intensity that is approximately zero crossing.
  • the M light intensity when the first test pixel value is collected is the same as the M light intensity when the second test pixel value is collected.
  • the same gear position has the same light intensity.
  • the first test pixel value under the M light intensity may be acquired, and for the second test unit, the second test pixel value under the M light intensity is also acquired, the mth of the first test unit The light intensity is the same as the mth light intensity of the second test unit.
  • the linear relationship as shown above may include: a linear slope k' n and a linear intercept b' n .
  • the linear slope is a linear slope of the output pixel value of each pixel point and the incident light intensity, the linear intercept being a linear intercept of the output pixel value of each pixel point and the incident light intensity.
  • the test pixel values output by each pixel point are subtracted, that is, according to the first test pixel value and the second test.
  • the pixel value is obtained by the following formula (8).
  • k n can be used to indicate the difference in photographic performance and optical path difference of each pixel of the fingerprint sensor. It can be used to indicate information such as the upper surface of the cover glass of the display screen or the dirty scratches of the first test unit and the second test unit.
  • K' n is a linear slope, which can be used not only to indicate the difference in photographic performance and optical path difference of each pixel of the fingerprint sensor, but also to indicate that the cover glass of the display indicates the dirty scratch of the first test unit and the second test unit.
  • b' n b n
  • b' n is a linear intercept, which can indicate the difference in photographic performance of each pixel of the fingerprint sensor.
  • N is the number of pixels of the fingerprint sensor. The least squares linear fitting is performed on the equations represented by the above formula (9) to obtain k' n and b' n as shown in the following formula (10).
  • the method can also calibrate the fingerprint pixel values in a variety of ways.
  • a linear fitting is performed by taking the least squares method as an example.
  • other linear fitting methods may be used to obtain the linear slope and the linear intercept.
  • the method provided by this embodiment may calibrate the fingerprint pixel value according to the determined linear relationship to obtain a fingerprint image.
  • the fingerprint pixel value can be directly calibrated according to the determined linear relationship in a manner similar to the above formula (6) to obtain a fingerprint image.
  • the fingerprint pixel value may be calibrated according to the determined linear relationship and other parameter information, such as a preset reference pixel value, to obtain a fingerprint image.
  • the method S203 shown above calibrates the fingerprint pixel value according to the linear relationship, and obtaining the fingerprint image may include:
  • the fingerprint pixel value is calibrated according to the linear relationship and the preset reference pixel value to obtain the fingerprint image.
  • the preset reference pixel value may be obtained according to a historical experience value, or may be determined from the first test pixel value or the second test pixel value mentioned above, and the application is not limited.
  • the fingerprint pixel value is calibrated according to the linear relationship and the preset reference pixel value, and the method further includes:
  • test pixel value outputted by each pixel at the second light intensity is determined as the reference pixel value.
  • a second test pixel value that is output by the pixel point under the second light intensity j may be selected from the second test pixel value of the at least one light intensity of each pixel, and determined as the The reference pixel value.
  • the first light intensity i may be the same as or different from the second light intensity j; if the first light intensity i is different from the second light intensity j, the smaller the difference, the smaller the interference of the pattern information. That is to say, the difference between the first light intensity i and the second light intensity j may also be within a preset range.
  • the second test pixel value that each pixel point outputs at the second light intensity j when the second test unit is pressed As a fixed reference pixel value, the reference pixel value can be expressed as
  • the fingerprint pixel value output by the nth pixel of the fingerprint sensor at the first light intensity i can be expressed by the above formula (2) when the finger is pressed.
  • the second test pixel outputted by the nth pixel point of the fingerprint sensor at the second light intensity j when the second test unit is pressed may be pressed value Save the fingerprint pixel value represented by the above formula (2) as a fixed reference pixel value First subtract the corresponding The calibration of the fingerprint pixel value is performed in combination with the linear slope k' n and the linear intercept b' n to obtain a fingerprint image P as shown in the following formula (11).
  • the nth pixel point Reflecting light inside the screen corresponding to the first light intensity i for the nth pixel;
  • the nth pixel point reflects light on the upper surface of the corresponding cover glass under the first light intensity i, with fingerprint information;
  • the nth pixel points reflect light at the corresponding finger under the first light intensity i.
  • the reflected light of the second test unit corresponding to the first light intensity i at the nth pixel point correspond to the fingerprint information at the first light intensity i.
  • a and B are constants, obviously when the first light intensity i and the second light intensity j are identical, After calibration, a pure fingerprint image can be obtained, which is not affected by the difference in the photographic performance of each pixel of the fingerprint sensor, the optical path difference of each pixel, and the laminated pattern information inside the screen.
  • the first light intensity i and the second light intensity j may also be different. If the first light intensity i is different from the second light intensity j, After the calibration, the fingerprint image can be obtained, or the interference of the pattern information of each laminate inside the display screen is received, and the smaller the difference between the first light intensity i and the second light intensity j, the smaller the interference of the pattern information.
  • the embodiment provides a method for calibrating the fingerprint pixel value according to the determined linear relationship between the output pixel value of each pixel point and the incident light intensity in the case of two test units, thereby effectively reducing the pixel points.
  • Sensitivity to fingerprint pixel values such as sensitization difference and optical path difference; and, if the light intensity corresponding to the reference pixel value is the same as the light intensity when the fingerprint value is collected, or the difference between the light intensity is within a preset range,
  • the interference of the pattern information carried in the reflected light inside the small display screen on the fingerprint image makes the interference of the pattern information carried in the reflected light inside the display screen to the fingerprint image within a certain range or even disappears completely, thereby improving the clarity of the fingerprint image. Degree, improve the accuracy and accuracy of fingerprint recognition.
  • the application can also provide an image processing method.
  • the image processing method is one possible example of the image processing method in the case of the two test units described in the above embodiments.
  • FIG. 4 is a flowchart of still another image processing method according to an embodiment of the present application. As shown in FIG. 4, the method can include:
  • the first test pixel value outputted by each pixel at the M light intensity may be represented by the above formula (3), which may be: M is an integer greater than or equal to 1.
  • M is an integer greater than or equal to 1.
  • the reflectance of the first test unit is better than that of most of the fingers.
  • the second test pixel value outputted by the respective pixel points under the M light intensity may be represented by the above formula (7), which may be: M is an integer greater than or equal to 1.
  • the reflectance of the second test unit is preferably less than the reflectance of most of the fingers.
  • the difference between the first test pixel value and the second test pixel value of each pixel at the same light intensity m may be expressed as: E 1 , E 2 , . . . , E M . among them,
  • the second test pixel value outputted by each pixel point under the light intensity j can be expressed as
  • the fingerprint pixel value outputted by each pixel at the light intensity i can be expressed by the above formula (2),
  • the fingerprint pixel value can be based on the linear slope k' n , the linear intercept b' n , and the reference pixel FixBase. Perform calibration to obtain a fingerprint image P, where
  • the embodiment provides a method, which can effectively reduce the interference of the pixel difference between the pixel difference and the optical path difference in the case of two test units, and can also reduce the pattern information in the reflected light inside the display screen.
  • the interference of the fingerprint image makes the interference of the pattern information in the reflected light inside the display screen to a certain range within the certain range, or even disappears completely, thereby improving the definition of the fingerprint image and improving the accuracy and accuracy of the fingerprint recognition.
  • FIG. 5 is a schematic structural diagram of an image processing apparatus according to an embodiment of the present application.
  • the image processing apparatus can be applied to an electronic device having fingerprint recognition, the electronic device comprising: a display screen and a fingerprint sensor; the fingerprint sensor being located below the display screen, the fingerprint sensor comprising a plurality of pixel points.
  • the image processing device can be implemented by software and/or hardware and can be integrated inside the electronic device.
  • the image processing apparatus 50 includes a determination module 51, an acquisition module 52, and a calibration module 53.
  • the determining module 51 is configured to determine a linear relationship between an output pixel value of each pixel point of the fingerprint sensor and an incident light intensity.
  • the acquisition module 52 is further configured to collect, when the finger is pressed, the fingerprint pixel value output by the pixel at the first light intensity.
  • the calibration module 53 is configured to calibrate the fingerprint pixel value according to the linear relationship to obtain a fingerprint image.
  • the test unit includes a first test unit.
  • the acquiring module 52 is further configured to: when the first test unit is pressed, collect the first test pixel value of each pixel under multiple light intensities;
  • the determining module 51 is configured to determine a linear relationship between the output pixel value of each pixel point and the incident light intensity according to the first test pixel value.
  • the test unit includes a first test unit and a second test unit.
  • the collecting module 52 is configured to: when the first testing unit is pressed, collect the first test pixel value of each pixel at the at least one light intensity; and when the second testing unit presses, collect the pixel Pointing at a second test pixel value at the at least one light intensity;
  • the determining module 51 is configured to determine a linear relationship between the output pixel value of each pixel point and the incident light intensity according to the first test pixel value and the second test pixel value.
  • the linear relationship includes; a linear slope and a linear intercept.
  • the linear slope is a linear slope of the output pixel value of each pixel point and the incident light intensity, the linear intercept being a linear intercept of the output pixel value of each pixel point and the incident light intensity.
  • the calibration module 53 is specifically configured to calibrate the fingerprint pixel value according to the linear relationship and the preset reference pixel value to obtain the fingerprint image.
  • the determining module 51 is further configured to determine the test pixel value output by each pixel point at the second light intensity as the reference pixel value.
  • the first light intensity is equal to the second light intensity.
  • the image processing apparatus provided in this embodiment can perform the image processing method shown in any of the above-mentioned FIG. 1 to FIG. 4, and the specific implementation and effective effects thereof can be referred to the above, and details are not described herein again.
  • FIG. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
  • the electronic device 60 of the present embodiment includes a display screen 61 and a fingerprint sensor 62; the fingerprint sensor 62 is located below the display screen 61, and the fingerprint sensor 62 includes a plurality of pixel points.
  • the electronic device 60 also includes a memory 63 and a processor 64.
  • the display screen 61, the fingerprint sensor 62, and the memory 63 are respectively connected to the processor 54 via the bus 65.
  • the memory 63 is configured to store program instructions.
  • the processor 64 when used to call the program instruction stored in the memory 63, performs the following steps:
  • the fingerprint pixel value is calibrated to obtain a fingerprint image.
  • the test unit includes a first test unit.
  • the processor 64 is configured to: when the first test unit is pressed, collect a first test pixel value of each pixel at a plurality of light intensities; and determine, according to the first test pixel value, each of the pixel points A linear relationship between the output pixel value and the incident light intensity.
  • the test unit includes a first test unit and a second test unit.
  • the processor 64 is configured to: when the first test unit is pressed, collect the first test pixel value of each pixel at the at least one light intensity; and when the second test unit presses, collect the pixel point. a second test pixel value at the at least one light intensity; determining a linear relationship between the output pixel value of each pixel point and the incident light intensity based on the first test pixel value and the second test pixel value.
  • the linear relationship includes; a linear slope and a linear intercept.
  • the processor 64 is configured to determine the linear slope and the linear intercept according to the first test pixel value and the second test pixel value; the linear slope is a linear relationship between the output pixel value of each pixel and the incident light intensity A slope that is a linear intercept of the output pixel value of each pixel and the incident light intensity.
  • the processor 64 is configured to perform calibration on the fingerprint pixel value according to the linear relationship and the preset reference pixel value to obtain the fingerprint image.
  • the processor 64 is further configured to determine the test pixel value output by each pixel point at the second light intensity as the reference pixel value.
  • the first light intensity is equal to the second light intensity.
  • the electronic device provided in this embodiment can perform the image processing method shown in any of the above-mentioned FIG. 1 to FIG. 4, and the specific implementation and effective effects thereof can be referred to the above, and details are not described herein again.
  • the embodiment of the present application further provides a computer readable storage medium, where the computer program is stored, and the computer program can be executed by the processor 64 shown in FIG. 6 to implement the image processing method shown in any of the embodiments.
  • the computer program can be executed by the processor 64 shown in FIG. 6 to implement the image processing method shown in any of the embodiments.
  • the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed.
  • the foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
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Abstract

La présente invention concerne un procédé et un appareil de traitement d'image, un dispositif, et un support de stockage. Le procédé comprend les étapes consistant à : déterminer la relation linéaire entre une valeur de pixel de sortie et une intensité de lumière incidente de chaque point de pixel ; lorsqu'un doigt appuie, collecter une valeur de pixel d'empreinte digitale de chaque point de pixel à une première intensité de lumière ; et corriger la valeur de pixel d'empreinte digitale selon la relation linéaire. La présente invention peut améliorer la précision de reconnaissance d'empreinte digitale.
PCT/CN2018/083362 2018-04-17 2018-04-17 Procédé et appareil de traitement d'image, et dispositif électronique Ceased WO2019200529A1 (fr)

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