WO2021056801A1 - Composant d'imagerie permettant de bloquer une interférence de lumière ambiante, et procédé d'imagerie d'image - Google Patents

Composant d'imagerie permettant de bloquer une interférence de lumière ambiante, et procédé d'imagerie d'image Download PDF

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Publication number
WO2021056801A1
WO2021056801A1 PCT/CN2019/121128 CN2019121128W WO2021056801A1 WO 2021056801 A1 WO2021056801 A1 WO 2021056801A1 CN 2019121128 W CN2019121128 W CN 2019121128W WO 2021056801 A1 WO2021056801 A1 WO 2021056801A1
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WIPO (PCT)
Prior art keywords
image signal
image
image sensor
ambient light
light interference
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Ceased
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PCT/CN2019/121128
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English (en)
Chinese (zh)
Inventor
代玲玲
严鸿飞
周方明
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Li Chuang Zhi Heng Electronics Technology Co Ltd
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Li Chuang Zhi Heng Electronics Technology Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/10—Image acquisition
    • G06V10/12—Details of acquisition arrangements; Constructional details thereof
    • G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
    • G06V10/141—Control of illumination
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/10—Image acquisition
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/10—Image acquisition
    • G06V10/12—Details of acquisition arrangements; Constructional details thereof
    • G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
    • G06V10/147—Details of sensors, e.g. sensor lenses
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V20/00—Scenes; Scene-specific elements
    • G06V20/50—Context or environment of the image
    • G06V20/56—Context or environment of the image exterior to a vehicle by using sensors mounted on the vehicle
    • G06V20/588—Recognition of the road, e.g. of lane markings; Recognition of the vehicle driving pattern in relation to the road
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/95—Computational photography systems, e.g. light-field imaging systems
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
    • H10F39/00—Integrated devices, or assemblies of multiple devices, comprising at least one element covered by group H10F30/00, e.g. radiation detectors comprising photodiode arrays
    • H10F39/10—Integrated devices
    • H10F39/12—Image sensors
    • H10F39/15—Charge-coupled device [CCD] image sensors

Definitions

  • the invention relates to the field of image imaging systems, and in particular to an imaging component and an image imaging method for shielding ambient light interference.
  • machine vision security systems are distinguished from the perspective of installation.
  • the main ground-to-vehicle and vehicle-to-ground ground-to-vehicle systems are placed on the rails to capture images of key components such as the bottom of the car, side frames, and top of the car.
  • the train status guarantees the safety of the train.
  • the train-to-ground system is mainly placed on the train to photograph steel rails, contact nets, and trackside objects to ensure that the train can run normally.
  • the machine vision security system is classified into two-dimensional imaging and three-dimensional imaging from the perspective of the image. Imaging, two-dimensional imaging is divided into line scan and area scan according to the type of camera.
  • Three-dimensional imaging methods mainly include laser triangulation and binocular three-dimensional imaging methods, but no matter which method of imaging, there is ambient light influence .
  • the existing technologies have the following problems with ambient light interference:
  • the function of the light source is to fill the camera with light, but due to the actual use of the environment, such as the superposition of train lights and sunlight, the camera is overexposed during shooting;
  • a beam of laser light emitted by the light source irradiates the plane of the object to be measured, and finally forms an image on the detector through reflection; when the position of the object surface changes, the image formed by it is shifted correspondingly on the detector.
  • the real object displacement can be obtained by the detection and calculation of the object image shift. Therefore, when the camera is collecting its own line laser, if there is the sun or light with the same spectrum as the line laser When it is irradiated, the camera will shoot other light spots. Therefore, the camera will make an error when extracting each light spot on the line of the line array laser, and there will be differences in the distance between the near and far positions.
  • the general method of this technology is to increase the brightness of the laser, reduce the exposure time of the camera, and increase the threshold of the camera to remove the ambient light.
  • the power of the laser is very high. There is a big safety factor risk.
  • its brightness should be stronger than direct sunlight, the light source is difficult to make, and the volume will be large;
  • the influence of ambient light interference on imaging is as follows: (1) The imaging effect. When there is light interference, the two-dimensional image will be overexposed. Therefore, people cannot see the true state of the train components, and there may be leakage failures that may cause the train. There is a safety hazard when driving. (2) Image recognition effect. With the introduction of machine vision imaging technology, the original train inspection has changed from outdoor manual inspection to indoor inspection and maintenance. However, in recent years, the number of trains has been increased for six times, and the number of EMUs and subways has been increasing. Railway personnel are in short supply, and the original image-viewing detection mode can no longer meet the requirements. Therefore, the intervention of three-dimensional imaging in recent years has brought the hope of solving image recognition for intelligent train image recognition. When all trains fail, either shape will occur.
  • the present invention provides an imaging component and an image imaging method that shields ambient light interference, which can completely eliminate ambient light interference.
  • the technical solution is as follows:
  • the present invention provides an imaging component that shields ambient light interference, which includes a camera lens, a compensation light source, an image sensor, a processor, and a display component,
  • the image sensor is arranged between the camera lens and the processor, and the output end of the image sensor is connected to the input end of the processor;
  • the compensation light source has an open state and a closed state, and provides compensation light for the image sensor in the open state, and the compensation light source is a laser or an LED;
  • the image sensor is used to collect a first image signal when the compensation light source is in the on state and a second image signal when the compensation light source is in the off state, and the first image signal includes the CCD photosensitive at each pixel position.
  • the number of charges, the second image signal includes the number of CCD photosensitive charges at each pixel position;
  • the collection time of the first image signal is equal to the collection time of the second image signal, and the time difference between the first image signal and the second image signal
  • the acquisition time difference is less than the preset time threshold;
  • the output terminal of the processor is connected to the input terminal of the display component, and the processor is used to perform a CCD photosensitive charge number subtraction operation on the first image signal and the second image signal to obtain an image signal without ambient light interference;
  • the processor includes a subtraction operation module and a data conversion module.
  • the subtraction operation module is used to subtract the number of CCD photosensitive charges on the first image signal and the second image signal collected by the image sensor to obtain an image without ambient light interference and output it The electrical signal to remove the ambient light from interfering with the image;
  • the data conversion module is used to convert the electrical signal into a data format that can be displayed by the display component;
  • the imaging component further includes a filter, the filter is used to filter out stray light, the filter is arranged on the optical path between the camera lens and the image sensor, or the filter is arranged In front of the light incident side of the camera lens.
  • the present invention also provides an imaging component that shields ambient light interference, which includes a camera lens, a beam splitter, a compensation light source, a first image sensor, a second image sensor, a processor, and a display component,
  • the beam splitter is arranged between the camera lens and the processor, the light passes through the beam splitter to form a first optical path and a second optical path, the first image sensor is arranged on the first optical path, and the second image sensor is arranged on the On the second optical path, the angle between the first optical path and the second optical path is 90 degrees; the output end of the first image sensor and the output end of the second image sensor are both connected to the processor;
  • the compensation light source has an open state and a closed state, and provides compensation light for both the first image sensor and the second image sensor in the open state, and the compensation light source is a laser or an LED;
  • the first image sensor is used to collect a first image signal when the compensation light source is in the on state; the second image sensor is used to collect a second image signal when the compensation light source is in the off state, the first The image signal includes the number of CCD photosensitive charges at each pixel position, and the second image signal includes the number of CCD photosensitive charges at each pixel position; the acquisition angles of the first image sensor and the second image sensor are the same, and the first image signal The acquisition time of is equal to the acquisition time of the second image signal, and the acquisition time difference between the first image signal and the second image signal is less than a preset time threshold;
  • the output end of the processor is connected to the input end of the display component, and the processor is used for subtracting the number of CCD photosensitive charges on the first image signal and the second image signal to obtain an image signal without ambient light interference;
  • the processor It includes a subtraction operation module and a data conversion module.
  • the subtraction operation module is used to subtract the number of CCD photosensitive charges on the first image signal and the second image signal collected by the image sensor to obtain an image without ambient light interference, and output the image Remove the electrical signal from the ambient light interfering with the image;
  • the data conversion module is used to convert the electrical signal into a data format that can be displayed by the display component;
  • the imaging component further includes a filter, which is arranged on the optical path between the camera lens and the beam splitter, or,
  • the filter is arranged in front of the light incident side of the camera lens, or
  • a first filter is arranged on the first light path between the light splitter and the first image sensor, and a second filter is arranged on the second light path between the light splitter and the second image sensor.
  • the present invention also provides an imaging component that shields ambient light interference, which includes a camera lens, a compensation light source, an image sensor, and a processor,
  • the image sensor is arranged between the camera lens and the processor, and the output end of the image sensor is connected to the input end of the processor;
  • the compensation light source has an open state and a closed state, and provides compensation light for the image sensor in the open state;
  • the image sensor is configured to collect a first image signal when the compensation light source is in an on state and collect a second image signal when the compensation light source is in an off state;
  • the processor is configured to perform a subtraction operation of the number of CCD photosensitive charges on the first image signal and the second image signal to obtain an image signal that eliminates ambient light interference.
  • the imaging component further includes a filter, and the filter is arranged on the optical path between the camera lens and the image sensor.
  • the imaging assembly further includes a filter, and the filter is arranged in front of the light incident side of the camera lens.
  • the present invention further provides an imaging component for shielding ambient light interference, which includes a camera lens, a beam splitter, a compensation light source, a first image sensor, a second image sensor, and a processor,
  • the beam splitter is arranged between the camera lens and the processor, the light passes through the beam splitter to form a first optical path and a second optical path, the first image sensor is arranged on the first optical path, and the second image sensor is arranged on the The second optical path; the output end of the first image sensor and the output end of the second image sensor are both connected to the processor;
  • the compensation light source has an open state and a closed state, and provides compensation light for both the first image sensor and the second image sensor in the open state;
  • the first image sensor is used to collect a first image signal when the compensation light source is in an on state
  • the second image sensor is used to collect a second image signal when the compensation light source is off; the collection angles of the first image sensor and the second image sensor are the same;
  • the processor is used for subtracting the number of CCD photosensitive charges on the first image signal and the second image signal to obtain an image signal without ambient light interference.
  • a first filter is provided on the first optical path between the beam splitter and the first image sensor, and a second filter is provided on the second optical path between the beam splitter and the second image sensor .
  • a filter is provided in front of the light incident side of the camera lens.
  • the present invention provides yet another imaging component that shields ambient light interference, which includes a camera lens, a filter, a light splitter, a compensation light source, a first image sensor, a second image sensor, a processor, and a display component,
  • the filter is arranged on the optical path between the camera lens and the light splitter, and the output end of the first image sensor and the output end of the second image sensor are both connected to a processor;
  • Light passes through the beam splitter to form a first optical path and a second optical path, the first image sensor is arranged on the first optical path, and the second image sensor is arranged on the second optical path;
  • the compensation light source has an open state and a closed state, and provides compensation light for both the first image sensor and the second image sensor in the open state;
  • the first image sensor is used to collect a first image signal when the compensation light source is in an on state
  • the second image sensor is used to collect a second image signal when the compensation light source is off; the collection angles of the first image sensor and the second image sensor are the same;
  • the processor is used for subtracting the number of CCD photosensitive charges on the first image signal and the second image signal to obtain an image signal that eliminates ambient light interference.
  • the angle between the first light path and the second light path is 90 degrees.
  • the imaging component that shields ambient light interference further includes a display component, and the output end of the processor is connected to the input end of the display component.
  • the acquisition time of the first image signal and the acquisition time of the second image signal are equal, and the acquisition time difference between the first image signal and the second image signal is less than a preset time threshold.
  • the compensation light source is a laser or an LED.
  • the processor includes a subtraction operation module and a data conversion module,
  • the subtraction module is configured to perform a subtraction operation of the number of CCD photosensitive charges on the first image signal and the second image signal collected by the image sensor to obtain an image that is free of ambient light interference, and output the electrical signal of the image that is free of ambient light interference;
  • the data conversion module is used to convert the electrical signal into a data format that can be displayed by the display component.
  • the present invention provides an image imaging method for shielding ambient light interference, which includes the following steps:
  • step S3 Perform a CCD photosensitive charge subtraction operation on the first image signal in step S1 and the second image signal in step S2 to obtain an image signal that eliminates ambient light interference, specifically as follows: The CCD photosensitive charge at each pixel position is subtracted from the CCD photosensitive charge at the corresponding pixel position in the second image signal to obtain the CCD photosensitive charge difference at the corresponding pixel position, and the difference is obtained according to the CCD photosensitive charge at the corresponding pixel position. Ambient light interferes with the image signal;
  • step S4 Converting the image signal of removing ambient light interference in step S3 into a data format that can be displayed by the display component;
  • step S1 the first image sensor is used to collect the first image signal
  • step S2 the second image sensor is used to collect the second image signal
  • the acquisition angles of the first image sensor and the second image sensor are the same, or
  • steps S1 and S2 the first image signal and the second image signal are both collected by the same image sensor.
  • the present invention also provides an image imaging method for shielding ambient light interference, which includes the following steps:
  • step S3 Perform a CCD photosensitive charge number subtraction operation on the first image signal in step S1 and the second image signal in step S2 to obtain an image signal that eliminates ambient light interference.
  • the details are as follows: The number of CCD photosensitive charges at each pixel position is subtracted from the number of CCD photosensitive charges corresponding to the pixel position in the first image signal to obtain the difference of the number of CCD photosensitive charges corresponding to the pixel position, and the difference of the number of CCD photosensitive charges at the corresponding pixel position is obtained. Ambient light interferes with the image signal;
  • step S4 Converting the image signal of removing ambient light interference in step S3 into a data format that can be displayed by the display component;
  • step S1 the first image sensor is used to collect the first image signal; in step S2, the second image sensor is used to collect the second image signal, and the acquisition angles of the first image sensor and the second image sensor are the same, or
  • steps S1 and S2 the first image signal and the second image signal are both collected by the same image sensor.
  • the present invention also provides an image imaging method for shielding ambient light interference, which includes the following steps:
  • step S3 Perform a subtraction operation of the number of CCD photosensitive charges on the first image signal in step S1 and the second image signal in step S2 to obtain an image signal that eliminates ambient light interference.
  • the image imaging method further includes the following steps:
  • step S4 Convert the image signal of removing the ambient light interference in step S3 into a data format that can be displayed by the display component.
  • step S1 a first image sensor is used to collect a first image signal; in step S2, a second image sensor is used to collect a second image signal, and the acquisition angles of the first image sensor and the second image sensor are the same .
  • steps S1 and S2 the first image signal and the second image signal are both collected by the same image sensor.
  • step S3 the CCD photosensitive charge count at each pixel position in the first image signal is subtracted from the CCD photosensitive charge count at the corresponding pixel position in the second image signal to obtain the CCD photosensitive charge count difference at the corresponding pixel position. According to the difference in the number of CCD photosensitive charges at the corresponding pixel position, an image signal for eliminating ambient light interference is obtained.
  • the present invention further provides an image imaging method for shielding ambient light interference, which includes the following steps:
  • step S3 Perform a subtraction operation of the number of CCD photosensitive charges on the first image signal in step S1 and the second image signal in step S2 to obtain an image signal that eliminates ambient light interference.
  • the image imaging method further includes the following steps:
  • step S4 Convert the image signal of removing the ambient light interference in step S3 into a data format that can be displayed by the display component.
  • step S1 a first image sensor is used to collect a first image signal; in step S2, a second image sensor is used to collect a second image signal, and the acquisition angles of the first image sensor and the second image sensor are the same .
  • steps S1 and S2 the first image signal and the second image signal are both collected by the same image sensor.
  • step S3 the CCD photosensitive charge count at each pixel position in the second image signal is subtracted from the CCD photosensitive charge count at the corresponding pixel position in the first image signal to obtain the CCD photosensitive charge count difference at the corresponding pixel position. According to the difference in the number of CCD photosensitive charges at the corresponding pixel position, an image signal for eliminating ambient light interference is obtained.
  • One image sensor or two image sensors are set in the imaging component designed in the present invention, and an image shielded from ambient light interference can be obtained through subtraction;
  • an image shielded from ambient light interference can be obtained through subtraction, and the ambient light interference can be completely eliminated.
  • FIG. 1 is a schematic diagram of an imaging component for shielding ambient light interference provided by an embodiment of the present invention to capture a laser line and the sun or ambient light;
  • FIG. 2 is a schematic diagram of an imaging component for shielding ambient light interference provided by an embodiment of the present invention to photograph the sun or ambient light;
  • FIG. 3 is a schematic diagram of the imaging component for shielding ambient light interference provided by an embodiment of the present invention after subtracting FIGS. 1 and 2;
  • FIG. 4 is a first structural diagram of an imaging component shielding ambient light interference provided by an embodiment of the present invention.
  • FIG. 5 is a second structural diagram of an imaging component for shielding ambient light interference provided by an embodiment of the present invention.
  • FIG. 6 is a third structural diagram of an imaging component for shielding ambient light interference provided by an embodiment of the present invention.
  • FIG. 7 is a fourth structural diagram of an imaging component for shielding ambient light interference provided by an embodiment of the present invention.
  • FIG. 8 is a fifth structural diagram of an imaging component for shielding ambient light interference provided by an embodiment of the present invention.
  • FIG. 9 is a sixth structural diagram of an imaging component for shielding ambient light interference provided by an embodiment of the present invention.
  • FIG. 10 is a seventh structural diagram of an imaging component for shielding ambient light interference provided by an embodiment of the present invention.
  • FIG. 11 is a flowchart of an imaging method of an imaging component shielded from ambient light interference provided by an embodiment of the present invention.
  • the reference signs include: 1-camera lens, 2-filter, 3-compensation light source, 4-image sensor, 5-processor, 6-display assembly, 7-splitter, 8-first image sensor, 9-Second image sensor, 10-First filter, 11-Second filter.
  • the object to be measured has a static state and a moving state.
  • the imaging component that shields ambient light interference provided in this application can be used to capture images without ambient light interference. The principle is explained as follows:
  • the second case When the object to be measured (such as a high-speed train) is moving, because the camera is a high-speed camera, the connected exposure frequency is within 20US. When the high-speed train runs at a maximum speed of 300KM/H, it is about 83 meters per second, 1ms About 83mm, the 20Us train travels about 1.6mm. In the image algorithm, the error is basically unaffected. Also, due to the short time, the measured object can be regarded as stationary. The same is true for the first case described above.
  • an imaging component that shields ambient light interference.
  • the imaging component is used in various fields, such as the rail transit vehicle industry.
  • the specific structure is shown in FIG. 4, including a camera lens 1, a compensation light source 3. , The image sensor 4, the processor 5, and the display assembly 6.
  • the compensation light source 3 is a laser or LED.
  • the image sensor faces the rail transit vehicle, and the light source 3 and the image sensor
  • the image sensor 4 is arranged between the camera lens 1 and the processor 5, the output end of the image sensor is connected to the input end of the processor 5, and the output end of the processor 5 is connected to the display
  • the input end of the component 6 is connected, and the display component 6 includes a display connected to the processor 5.
  • the compensation light source 3 has an open state and a closed state, and provides compensation light for the image sensor 4 in the open state; the image sensor 4 is used to collect the first image signal when the compensation light source 3 is in the open state and The second image signal is collected when the compensation light source 3 is turned off (the compensation light source is turned off within a preset time threshold range, and the image sensor 4 collects the second image signal), and the first image signal includes the position of each pixel
  • the number of CCD photosensitive charges, the second image signal includes the number of CCD photosensitive charges at each pixel position;
  • the processor 5 is used to subtract the number of CCD photosensitive charges on the first image signal and the second image signal to obtain The ambient light interferes with the image signal.
  • the processor 5 includes a subtraction operation module and a data conversion module.
  • the subtraction operation module is used to subtract the number of CCD photosensitive charges on the first image signal and the second image signal collected by the image sensor to obtain an image without ambient light interference.
  • the data conversion module is used to convert the electrical signal into a data format that can be displayed by the display component.
  • first turn off the compensation light source use the image sensor to collect the first image signal, then turn on the compensation light source within the preset time threshold range, use the image sensor to collect the second image signal, and then compare the first image signal with the first image signal.
  • the image signal is subtracted from the number of CCD photosensitive charges to obtain an image signal that eliminates ambient light interference.
  • the ambient light interference image is obtained by this solution, and is not affected by time; when the measured object moves, the acquisition time difference between the first image signal and the second image signal is less than the preset time threshold , The faster the moving speed of the measured object, the smaller the preset time threshold, and the measured object can be regarded as stationary; in one embodiment, the preset time threshold is 20 Us.
  • Charge coupling device image sensor CCD which is made of a high-sensitivity semiconductor material, can convert light into electric charge, through analog-to-digital conversion
  • the chip is converted into a digital signal. After the digital signal is compressed, it is stored in the camera's internal flash memory or built-in hard disk card. Therefore, the data can be easily transmitted to the computer, and the image can be modified as needed with the help of the computer's processing means.
  • CCD is composed of many photosensitive units, usually in megapixels. When the surface of the CCD is illuminated by light, each photosensitive unit will reflect the charge on the component, and the signals generated by all the photosensitive units are added together to form a complete picture.
  • an imaging component that shields ambient light interference.
  • the imaging component is used in various fields, such as the rail transit vehicle industry.
  • the specific structure is shown in FIG. 5, including a camera lens 1.
  • Sheet 2 compensation light source 3, image sensor (CCD), processor 5, and display assembly 6.
  • the compensation light source 3 is a laser or LED.
  • the imaging assembly is used in the rail transit industry, the image sensor faces the rail transit vehicle.
  • a spatial angle is formed between the light source 1 and the image sensor; embodiment 2
  • Embodiment 1 The difference from Embodiment 1 is that a filter is added.
  • the filter 2 is arranged in front of the light incident side of the camera lens 1, and the output end of the image sensor is connected to the input end of the processor 5.
  • the output end of the processor 5 is connected to the input end of the display assembly 6, and the display assembly 6 includes a display connected to the processor 5.
  • the filter is used to filter out stray light, which is selected according to the spectrum of the compensation light source, and different filters are determined according to specific needs.
  • an imaging component that shields ambient light interference.
  • the imaging component is used in various fields, such as the rail transit vehicle industry.
  • the specific structure is shown in FIG. 6, including a camera lens 1.
  • Sheet 2 compensation light source 3, image sensor (CCD), processor 5, and display assembly 6.
  • the compensation light source 3 is laser or LED.
  • the imaging assembly is used in the rail transit industry, the image sensor faces the rail transit vehicle.
  • a spatial angle is formed between the light source 1 and the image sensor; the difference between Embodiment 3 and Embodiment 1 is the addition of a filter, and the filter 2 is arranged on the optical path between the camera lens 1 and the image sensor 4
  • the output end of the image sensor is connected to the input end of the processor 5, and the output end of the processor 5 is connected to the input end of the display assembly 6, and the display assembly 6 includes a display connected to the processor 5.
  • the filter is used to filter out stray light, which is selected according to the spectrum of the compensation light source, and different filters are determined according to specific needs.
  • an imaging component that shields ambient light interference.
  • the imaging component is used in various fields, such as the rail transit vehicle industry.
  • the specific structure is shown in FIG. 7, which includes a camera lens 1, a light splitter Sheet 7, compensation light source 3, first image sensor 8, second image sensor 9, processor 5, and display assembly 6.
  • the compensation light source 3 is a laser or LED.
  • the first image sensor An image sensor 8 and a second image sensor 9 both face the rail transit vehicle, and the light source 1 forms a spatial angle with the first image sensor 8 and the second image sensor 9;
  • the beam splitter 7 is arranged on the camera lens 1 and the processor 5, the light passes through the beam splitter 7 to form a first light path and a second light path, the first image sensor 8 is arranged on the first light path, and the second image sensor 9 is arranged on the second light path.
  • the angle between the first optical path and the second optical path is preferably 90 degrees; the output end of the first image sensor 8 and the output end of the second image sensor 9 are both connected to the processor 5;
  • the compensation light source 3 has an open state and a closed state, and provides compensation light for both the first image sensor 8 and the second image sensor 9 in the open state; the first image sensor 8 is used for when the compensation light source 3 is in The first image signal is collected in the open state; the second image sensor 9 is used to collect the second image signal when the compensation light source 3 is in the off state, and the first image signal includes the number of CCD photosensitive charges at each pixel position, The second image signal includes the number of CCD photosensitive charges at each pixel position; the processor 5 is used for subtracting the number of CCD photosensitive charges on the first image signal and the second image signal to obtain an image signal that eliminates ambient light interference.
  • the number of CCD photosensitive charges at each pixel position in the first image signal is subtracted from the number of CCD photosensitive charges at the corresponding pixel position in the second image signal to obtain the difference in the number of CCD photosensitive charges at the corresponding pixel position, according to the corresponding pixel position
  • the difference in the number of photosensitive charges of the CCD obtains the image signal to remove the ambient light interference; preferably, the acquisition angles of the first image sensor and the second image sensor are the same, and the acquisition angle means that the first image sensor and the second image sensor face the object to be measured.
  • the same angle of acquisition and the same collection angle can ensure that the image of the measured object is consistent, and it is convenient for the processor to subtract the number of CCD photosensitive charges on the first image signal and the second image signal to obtain the image signal without ambient light interference.
  • the processor 5 includes a subtraction module and a data conversion module.
  • the subtraction module is used to subtract the CCD photosensitive charge from the first image signal and the second image signal collected by the first image sensor to obtain the ambient light Interfere with the image, and output the electrical signal that eliminates ambient light interference with the image;
  • the data conversion module is used to convert the electrical signal into a data format that can be displayed by the display component.
  • first turn off the compensation light source use the first image sensor to collect the first image signal, then turn on the compensation light source within the preset time threshold range, use the second image sensor to collect the second image signal, and then compare the first image signal Perform a subtraction operation of the CCD photosensitive charge number with the second image signal to obtain an image signal that eliminates ambient light interference.
  • the imaging assembly further includes a filter, and the position of the filter is arranged in three structures.
  • the first position is that a filter 2 is arranged in front of the light incident side of the camera lens 1, see FIG. 8 for details.
  • the second position is that the filter 2 is arranged on the optical path between the camera lens 1 and the beam splitter 7, see FIG. 10 for details.
  • the third position is that a first filter 10 is provided on the first optical path between the beam splitter 7 and the first image sensor 8, and the second optical path between the beam splitter 7 and the second image sensor 9
  • a second filter 11 is provided, see FIG. 9 for details.
  • the filter is selected according to the spectrum of the compensation light source, and different filters are determined according to specific needs.
  • the ambient light interference image is obtained by this solution, and is not affected by time; when the measured object moves, the acquisition time difference between the first image signal and the second image signal is less than the preset time threshold , The faster the measured object moves and the smaller the preset time threshold, the measured object can be regarded as stationary.
  • embodiment 4 and embodiment 1-3 lie in the number of image sensors.
  • Another image sensor ensures that the angle of the measured object is exactly the same in the two shots;
  • the storage time of the two shots has a greater impact Small, the time gap between the two acquisitions can be ignored, continuous and rapid exposure can be achieved, and the requirements for the camera are low;
  • the other two image sensors may have deviations in the angle of the measured object twice, so the first image needs to be guaranteed
  • the acquisition angles of the sensor and the second image sensor are the same to reduce the effect of deviation.
  • Embodiment 4 of the present application two image sensors are used.
  • the light When light enters the camera lens, the light is split by a light splitter so that the effects of the object scene and ambient light captured by the two cameras are consistent.
  • the device also needs to ensure that the two image sensor models are sensitive
  • the parameters of the two image sensors are the same during use.
  • the specific instructions are as follows: turn on the light source, and the first image sensor takes pictures of moving or stationary objects as shown in Figure 1 (the camera captures the laser line and the sun or ambient light) As shown, the light source is turned off, the first image sensor stops collecting, and the second camera is exposed and collected separately as shown in Figure 2 (the camera only captures the sun or ambient light).
  • the final subtraction is performed as shown in Figure 3 below, with only laser Line, there is no sun or ambient light, it means that through this imaging component, the ambient light interference has been shielded, and an image shielded from the ambient light interference has been obtained.
  • the acquisition time of the first image signal and the acquisition time of the second image signal are equal, and the time taken by one image sensor (CCD) for two separate shooting is the same, or, the time taken by two image sensors (CCD) for shooting separately Consistency can ensure that the amount of ambient light entering the CCD is the same, and it also ensures that the effect of removing the influence of ambient light is better.
  • the filters are used to filter light interference, but the placement of the filters is different. Among them, if the filter is placed in front of the camera lens, it will be exposed to direct sunlight, and the characteristics of the filter will be warm. Drift will cause the effect of the filter to change, but it only slightly affects the effect, and does not affect the final result of the ambient light interference image; and the filter is placed in other positions (between the camera lens and the image sensor, the splitter and The effect is the same between the image sensors, between the camera lens and the beam splitter, or at the front end of the respective image sensors, and is not interfered by sunlight, and finally can obtain images without ambient light interference.
  • the present invention provides an image imaging method for shielding ambient light interference, as shown in FIG. 11, which includes the following steps:
  • step S3 Perform a CCD photosensitive charge number subtraction operation on the first image signal in step S1 and the second image signal in step S2 to obtain an image signal that eliminates ambient light interference. Specifically, in step S3, The CCD photosensitive charge at each pixel position in an image signal is subtracted from the CCD photosensitive charge at the corresponding pixel position in the second image signal to obtain the CCD photosensitive charge difference at the corresponding pixel position, according to the CCD photosensitive charge at the corresponding pixel position The number difference is obtained to remove the ambient light interference image signal.
  • step S3 the image imaging method further includes the following steps:
  • step S4 Convert the image signal of removing the ambient light interference in step S3 into a data format that can be displayed by the display component.
  • the first situation is: there are two image sensors, and in step S1, the first image sensor is used to collect the first image signal; In step S2, a second image sensor is used to collect a second image signal, and the collection angles of the first image sensor and the second image sensor are the same.
  • the second situation is: there is an image sensor, and in steps S1 and S2, the first image signal and the second image signal are both collected by the same image sensor.
  • the present invention provides another image imaging method for shielding ambient light interference, which includes the following steps:
  • step S3 Perform a CCD photosensitive charge number subtraction operation on the first image signal in step S1 and the second image signal in step S2 to obtain an image signal that eliminates ambient light interference. Specifically, in step S3, 2.
  • step S3 the image imaging method further includes the following steps:
  • step S4 Convert the image signal of removing the ambient light interference in step S3 into a data format that can be displayed by the display component.
  • the first scenario is: there are two image sensors, and in step S1, the first image sensor is used to collect the first image sensor. Image signal; In step S2, a second image sensor is used to collect a second image signal, and the acquisition angles of the first image sensor and the second image sensor are the same.
  • the second situation is that there are two image sensors, and in steps S1 and S2, both the first image signal and the second image signal are collected by the same image sensor.
  • the acquisition time of the first image signal and the acquisition time of the second image signal are preferably equal.

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Abstract

L'invention concerne un composant d'imagerie permettant de bloquer une interférence de lumière ambiante, et un procédé d'imagerie d'image. Le composant d'imagerie comprend un objectif de caméra, une source de lumière de compensation, un capteur d'image et un processeur ; le capteur d'image est disposé entre l'objectif de caméra et le processeur, et une extrémité de sortie du capteur d'image est connectée au processeur ; la source de lumière de compensation a un état allumé et un état éteint, et dans l'état allumé, elle fournit une lumière de compensation au capteur d'image ; le capteur d'image est utilisé pour collecter un premier signal d'image lorsque la source de lumière de compensation est dans l'état allumé et collecter un second signal d'image lorsque la source de lumière de compensation est dans l'état éteint, respectivement ; et le processeur est utilisé pour effectuer une opération de soustraction de nombre de charges photosensibles DTC sur le premier signal d'image et le second signal d'image de façon à obtenir un signal d'image dans lequel une interférence de lumière ambiante est éliminée. Un ou deux capteurs d'image sont disposés dans le composant d'imagerie conçu selon la présente invention, et une image dans laquelle une interférence de lumière ambiante est bloquée est obtenue au moyen d'une opération de soustraction ; et selon le procédé d'imagerie, une image dans laquelle une interférence de lumière ambiante est bloquée peut être obtenue au moyen d'une opération de soustraction, et une interférence de lumière ambiante peut être complètement éliminée.
PCT/CN2019/121128 2019-09-26 2019-11-27 Composant d'imagerie permettant de bloquer une interférence de lumière ambiante, et procédé d'imagerie d'image Ceased WO2021056801A1 (fr)

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