CN114363538A - Image acquisition control method, image acquisition device, computer apparatus, and medium - Google Patents
Image acquisition control method, image acquisition device, computer apparatus, and medium Download PDFInfo
- Publication number
- CN114363538A CN114363538A CN202210007782.6A CN202210007782A CN114363538A CN 114363538 A CN114363538 A CN 114363538A CN 202210007782 A CN202210007782 A CN 202210007782A CN 114363538 A CN114363538 A CN 114363538A
- Authority
- CN
- China
- Prior art keywords
- pixel
- image
- frame
- gray
- value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 56
- 238000005286 illumination Methods 0.000 claims description 28
- 230000002441 reversible effect Effects 0.000 claims description 21
- 238000004590 computer program Methods 0.000 claims description 10
- 238000003860 storage Methods 0.000 claims description 9
- 239000010409 thin film Substances 0.000 claims description 6
- 230000007547 defect Effects 0.000 abstract description 16
- 239000000969 carrier Substances 0.000 abstract description 14
- 229920006395 saturated elastomer Polymers 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 7
- 230000003287 optical effect Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 229910021417 amorphous silicon Inorganic materials 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000003491 array Methods 0.000 description 2
- 230000004298 light response Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 206010047571 Visual impairment Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000002059 diagnostic imaging Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000003702 image correction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Images
Abstract
The embodiment of the invention discloses an image acquisition control method, an image acquisition device, computer equipment and a medium. In a specific embodiment, the photosensor array includes a plurality of photosensors including photodiodes, and the image acquisition control method includes: forward biasing the photodiode; and controlling the photoelectric sensor array to acquire at least one frame of image. The residual image phenomenon in the image is eliminated by carrying out forward bias on the photodiode, a large number of carriers flow into the photodiode in the forward bias period, so that the defect state is in a saturated filling state, the defect state filling difference among pixels is reduced to a negligible magnitude, and the residual image phenomenon in the next frame of image acquired by the photodiode array is weakened.
Description
Technical Field
The present invention relates to the field of image acquisition. And more particularly, to an image capture control method, an image capture apparatus, a computer device, and a medium.
Background
With the improvement of the demand of people for information security, the biometric identification technology is more and more concerned by various fields. Among the biometric technologies, the fingerprint recognition technology has become the most interesting and widely applied technology due to its practical applicability, and the existing fingerprint recognition technology mainly converts an optical image into an electrical signal by a photoelectric sensor, so that the fingerprint image is recognized by an electronic device.
An amorphous silicon Thin Film Transistor (TFT) is widely used in the fields of medical imaging and biological identification because of its advantages of simple manufacturing process, low cost, and easy large-area fabrication.
But the TFT photoelectric sensor has disadvantages due to its own characteristics: in the TFT photoelectric sensor, 4 electrons on the outermost layer of each silicon atom do not completely form covalent bonds with adjacent silicon atoms, so that amorphous silicon generates defect state energy levels in the original conduction band and valence band; and secondly, a defect state energy level is inevitably introduced into the amorphous silicon in the TFT manufacturing process. These defect state levels trap carriers having a long lifetime and are continuously released from the trapping centers, and the released carriers are accumulated in the pixels, so that the gray value of the image increases. During image acquisition, the illumination intensity of each pixel of the TFT photoelectric sensor is different, and the capture and release quantity of carriers are different among the pixels. Therefore, when the current frame image is collected, the release process of the carriers captured by the defect state during the previous frame image collection can generate 'ghost shadow' in the current frame image, and the serious influence is generated on the image quality.
Disclosure of Invention
An object of the present invention is to provide an image acquisition control method, an image acquisition apparatus, a computer device, and a medium, which solve at least one of the problems of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the present invention provides in a first aspect an image acquisition control method for a photosensor array including a plurality of photosensors including photodiodes, the method including:
forward biasing the photodiode; and
and controlling the photoelectric sensor array to acquire at least one frame of image.
Optionally, after the forward biasing the photodiode and before the controlling the photosensor array to perform at least one frame of image acquisition, the method further comprises:
the photodiode is reverse biased.
Optionally, after the forward biasing the photodiode and before the controlling the photosensor array to perform at least one frame of image acquisition, the method further comprises:
and controlling the photoelectric sensor array to perform image blank acquisition, wherein the duration of the image blank acquisition is less than the duration of image acquisition of one frame.
Optionally, after the forward biasing the photodiode and before the controlling the photosensor array to perform at least one frame of image acquisition, the method further comprises:
reverse biasing the photodiode; and
and controlling the photoelectric sensor array to perform image blank acquisition, wherein the duration of the image blank acquisition is less than the duration of image acquisition of one frame.
Optionally, before the forward biasing the photodiode, the method further comprises:
forward biasing the photodiode;
under a first set illumination intensity, controlling the photoelectric sensor array to acquire an image with a set frame number, wherein the set frame number is N;
acquiring a gray reference value of each pixel according to the gray value of each pixel in the (N-M) th to N (N-M) th frame images acquired by the image acquisition of the set frame number; and
obtaining a gray compensation value of each pixel of the jth frame according to the gray value of each pixel in the jth frame image obtained by the image acquisition of the jth frame in the image acquisition of the set frame number and the gray reference value of each pixel, wherein J is 1,2, …, J;
the controlling the photosensor array to perform at least one frame of image acquisition comprises: and after the jth frame image is acquired to obtain a jth frame image, compensating the gray value of each pixel of the jth frame image according to the gray compensation value of each pixel of the jth frame image.
Optionally, the compensating the gray scale value of each pixel of the jth frame image according to the gray scale compensation value of each pixel of the jth frame image includes:
and respectively compensating the gray value of each pixel of the image of the jth frame according to the average value of the gray compensation values of each pixel of the jth frame.
Optionally, the compensating the gray scale value of each pixel of the jth frame image according to the gray scale compensation value of each pixel of the jth frame image includes:
and compensating the gray value of each pixel of the image of the jth frame in a one-to-one correspondence manner according to the gray compensation value of each pixel of the jth frame.
Optionally, obtaining a gray reference value of each pixel according to the gray value of each pixel in the (N-M) th to nth frame images acquired by the image acquisition of the set frame number comprises:
and taking the gray value of each pixel in the (N-M) th to N-th frame images acquired by the image acquisition with the set frame number as the gray reference value of each pixel.
Optionally, the controlling, at the first set illumination intensity, the photosensor array to perform image acquisition for a set frame number includes: under the first set illumination intensity, controlling the photoelectric sensor array to acquire images with set frame numbers; under the second set illumination intensity, controlling the photoelectric sensor array to acquire images with set frame numbers;
the obtaining of the gray reference value of each pixel according to the gray value of each pixel in the (N-M) th to N-th frame images acquired by the image acquisition of the set frame number comprises: obtaining a first gray reference value of each pixel according to the gray value of each pixel in the (N-M) th to N (N-M) th frame images acquired by the image with the set frame number under the first set illumination intensity; obtaining a second gray level reference value of each pixel according to the gray level value of each pixel in the (N-M) -th to N-th frame images acquired by the images with the set frame number under the second set illumination intensity;
obtaining a gray compensation value of each pixel of the jth frame according to the gray value of each pixel in the jth frame image obtained by the jth frame image acquisition in the jth frame image acquisition of the set frame number and the gray reference value of each pixel, comprises: obtaining a first gray compensation value of each pixel of a jth frame according to a gray value of each pixel in a jth frame image obtained by image acquisition of a jth frame in image acquisition of the set frame number under a first set illumination intensity and a first gray reference value of each pixel; obtaining a second gray compensation value of each pixel of a jth frame according to a gray value of each pixel in a jth frame image obtained by image acquisition of a jth frame in the image acquisition of the set frame number under a second set illumination intensity and a second gray reference value of each pixel; and obtaining the gray compensation value of each pixel of the jth frame according to the first gray compensation value of each pixel of the jth frame and the second gray compensation value of each pixel of the jth frame.
A second aspect of the present invention provides an image capturing apparatus comprising a controller and a photosensor array comprising a plurality of photosensors, the photosensors comprising photodiodes;
the controller is used for controlling the photoelectric sensor array to carry out image acquisition of at least one frame after the photodiode is subjected to forward bias.
Optionally, the photosensor further comprises a switching transistor connected to the cathode of the photodiode.
Optionally, the photodiode is a PIN photodiode, and the switching transistor is a thin film transistor.
A third aspect of the present invention provides a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the image acquisition control method according to the first aspect of the present invention when executing the program.
A fourth aspect of the present invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the image acquisition control method as provided in the first aspect of the present invention.
The invention has the following beneficial effects:
according to the invention, the residual image phenomenon in the image is eliminated by forward biasing the photodiode, and a large number of current carriers flow into the photodiode in the forward biasing period, so that the defect state is in a saturated filling state, and the defect state filling difference between pixels is reduced to a negligible level, thereby weakening the residual image phenomenon in the next frame of image acquired by the photodiode array and improving the image quality. The invention can be realized based on the existing signal reading circuit without additionally increasing system hardware.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 shows a flowchart of an image acquisition control method for a photosensor array according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a photosensor according to an embodiment of the present invention.
Fig. 3 is a flowchart illustrating an image capture control method for a photosensor array according to another embodiment of the present invention.
Fig. 4 is a flowchart illustrating an image capture control method for a photosensor array according to another embodiment of the present invention.
Fig. 5 is a flowchart illustrating an image capture control method for a photosensor array according to another embodiment of the present invention.
FIG. 6 shows a gray scale value plot for a single pixel of an acquired image provided by one embodiment of the present invention.
Figure 7 shows an optical response curve of a photosensor according to one embodiment of the present invention.
Fig. 8 illustrates an optical response curve of a compensated photosensor provided by one embodiment of the present invention.
Figure 9 illustrates fingerprint images before and after compensation provided by one embodiment of the present invention.
Fig. 10 is a schematic diagram of a computer device for implementing a controller according to an embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the present invention, the present invention will be further described with reference to the following examples and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
In order to solve the problem of image sticking caused by the difference of the filling quantity of defect states of the photosensors, a first embodiment of the present invention provides an image acquisition control method for a photosensor array, where the photosensor array includes a plurality of photosensors, the photosensors include photodiodes, as shown in fig. 1, and the method includes:
forward biasing the photodiode; and
and controlling the photoelectric sensor array to acquire at least one frame of image.
The specific implementation mode of the forward bias is as follows: applying forward bias voltage to the photodiodes means that the positive voltage of the photodiodes is greater than the negative voltage, so that all the photodiodes in the photosensor array are in a forward conduction state at the same time, the currents in the photodiodes are large, a large number of carriers rush into the photodiodes, so that the defect states are in a saturated filling state, the defect state filling difference between pixels is reduced to a negligible level, and therefore the afterimage phenomenon in the next frame of image acquired by the photodiode array is weakened, and the image quality is improved. In addition, the embodiment can be realized based on the existing signal reading circuit without additionally increasing system hardware, and can give consideration to low cost and high image quality. The duration of the forward bias is set according to the actual situation to be 10ms, for example.
The following describes an image capture control method of the photosensor array provided in this embodiment with reference to an actual scene, for example, the photosensor array is integrated in an electronic device and is mainly applied to fingerprint identification of a mobile electronic device. For example, a user places a finger over a fingerprint identification area for unlocking, and the mobile electronic device collects light reflected by the user's finger using the photoelectric sensor. That is, in the image capturing phase, the image capturing control method for the photosensor array provided in this embodiment includes: forward biasing a photodiode in the photosensor; and controlling the photoelectric sensor array to acquire at least one frame of image.
In a specific example, the photosensor array is formed by arranging 200 × 200 photosensor arrays, and the mobile electronic device draws a fingerprint image based on signals output by the photosensor arrays, wherein, for example, each photosensor corresponds to one pixel in the fingerprint image. As shown in fig. 2, the photosensor consists of a photosensitive device PIN photodiode and a switching TFT connected thereto, and when image acquisition is performed, the switching TFT is turned off and the PIN photodiode is in a reverse bias state (negative electrode voltage V)d>Positive electrodeVoltage Vb) When light irradiates on the PIN photodiode, photons are converted into carriers, the carriers move to two ends of the PIN photodiode under the action of a reverse bias electric field and are accumulated at two ends of the PIN photodiode, the switch TFT is turned on (conducted) in the next stage, the carriers accumulated in the PIN photodiode are transmitted out, and photoelectric signal conversion is realized.
It will be appreciated by those skilled in the art that in addition to PIN photodiodes, other photodiodes such as PN, avalanche, etc. are operated in a reverse biased state.
In one possible implementation, as shown in fig. 3, after the forward biasing the photodiode in the image acquisition phase and before the controlling the photosensor array to perform image acquisition for at least one frame, the image acquisition phase further includes:
reverse biasing the photodiode; wherein the content of the first and second substances,
the specific implementation mode of the reverse bias is as follows: applying a negative bias voltage to all PIN photodiodes of the photodiode array at the same time to enable a negative voltage V of the PIN photodiodesd>Positive electrode voltage VbThe PIN photodiode is now in a reverse conducting state, the duration of the reverse bias period being, for example, 20 ms. After the forward bias (or referred to as positive voltage reset) before the acquisition in the image acquisition stage is finished, because the defect state filling quantity is large, the quantity of carriers released in the defect state is large, and the next frame of image generally has a very high gray value, which shows that the image is whitish and is easy to generate a saturation state, therefore, the present implementation mode can release the saturation caused by the forward bias by performing the reverse bias (or referred to as reverse reset) before the acquisition in the image acquisition stage, so that the carriers captured by the defect state can be gradually released from the PIN photodiode.
Those skilled in the art will appreciate that the duration of the reverse bias period of 20ms is merely exemplary and may be set as appropriate.
In one possible implementation, as shown in fig. 4, after the forward biasing of the photodiode in the image acquisition phase and before the controlling of the photosensor array for at least one frame of image acquisition, the image acquisition phase further includes an image null acquisition period, the image null acquisition period including:
and controlling the photoelectric sensor array to carry out image empty acquisition. The duration of the image blank acquisition is less than that of one frame of image acquisition, and in the process, the voltage V at two ends of the PIN photodiodedAnd VbSetting a voltage value when an image is normally acquired, resetting and reading data row by the sensor array, wherein the duration of an image blank acquisition period is 21ms, for example, the 21ms comprises 20ms of system preparation time and 1ms of exposure time, the exposure time is the time for switching off the TFT or the interval time between two times of switching on of the TFT, the exposure time for image blank acquisition is short, and the acquired image is discarded;
the duration of the image acquisition of one frame is, for example, 120-220 ms, and includes a system setup time of 20ms and an exposure time of 100-200 ms, i.e., the time when the TFT is turned off or the time interval between two times of turning on of the TFT.
The realization mode enables the working state of the system to be more stable through the image empty acquisition.
In one possible implementation, as shown in fig. 5, after the forward biasing the photodiode and before the controlling the photosensor array to perform image acquisition for at least one frame, the image acquisition phase further includes:
reverse biasing the photodiode; and
and controlling the photoelectric sensor array to carry out image empty acquisition.
Wherein the content of the first and second substances,
the specific implementation mode of the reverse bias is as follows: applying a negative bias voltage to all PIN photodiodes of the photodiode array at the same time to enable a negative voltage V of the PIN photodiodesd>Positive electrode voltage VbWhen the PIN photodiode is in a reverse conducting state, the duration of the reverse bias period being, for example, 20ms, before the acquisition of the image acquisition stage, the reverse bias can release the saturation caused by the forward bias, and the carriers captured by the defect state can be gradually released from the PIN photodiode; the duration of the image null acquisition is less than that of one frame of image acquisition, and in the image null acquisition period, the voltage V at two ends of the photodiodedAnd VbSetting the voltage value when the image is normally acquired, resetting and reading data row by the sensor array, wherein the duration of the image empty acquisition period is 21ms for example; the 21ms comprises 20ms of system preparation time and 1ms of exposure time, wherein the exposure time is the time for switching off the TFT or the interval time between two times of switching on the TFT, the exposure time for image blank acquisition is short, and the acquired image can be discarded; the duration of the image acquisition of one frame is, for example, 120-220 ms, and includes a system setup time of 20ms and an exposure time of 100-200 ms, i.e., the time when the TFT is turned off or the time interval between two times of turning on of the TFT.
According to the implementation mode, reverse bias and image empty acquisition are sequentially carried out before acquisition in an image acquisition stage, and saturation caused by the forward bias can be released, so that carriers captured by a defect state can be gradually released from the PIN photodiode, and the working state of the system is more stable.
In one possible implementation, the inventors have analyzed that the problem of image sticking can be solved by forward biasing, but the gray-level values of the previous frames of images acquired by the photosensor will fluctuate. Therefore, in this embodiment, the gray compensation value saved in the initialization stage is used to compensate to eliminate the effect, specifically: before forward biasing the photodiode in an image acquisition phase, the method further includes an image initialization phase (e.g., in a factory test phase of a product), in which the calculation of the gray scale compensation value is performed, the image initialization phase including:
forward biasing the photodiode;
in an image initialization stage, a system continuously collects images from a first frame of image to images with stable image gray values, and controls a photoelectric sensor array to collect images with set frame numbers under a first set illumination intensity, wherein the set frame numbers are N, such as 100;
obtaining a gray reference value of each pixel according to the gray value of each pixel in the (N-M) th to N th frame images acquired by the image acquisition of the set frame number, wherein M is, for example, 50, namely, the gray average value of the next 50 frames in the next 100 frames is taken as a reference gray value to perform gray value compensation on the image; and
obtaining a gray compensation value of each pixel of the jth frame according to the gray value of each pixel in the jth frame image obtained by the image acquisition of the jth frame in the image acquisition of the set number of frames and the gray reference value of each pixel, wherein J is 1,2, …, J, and J is 10, for example, that is, the gray compensation is performed on the gray value of each pixel of the 1 st frame to the 10 th frame;
the controlling the photosensor array to perform at least one frame of image acquisition during the image acquisition phase comprises: and after the jth frame image is acquired to obtain a jth frame image, compensating the gray value of each pixel of the jth frame image according to the gray compensation value of each pixel of the jth frame image.
Further, in one possible implementation, the forward bias duration of the image initialization phase is, for example, 10 ms.
In a specific embodiment, the compensation of the gray value of each pixel of the image of the jth frame is implemented by using an average value compensation method, where the average value compensation method includes:
and respectively compensating the gray value of each pixel of the image of the jth frame according to the average value of the gray compensation values of each pixel of the jth frame, wherein J is 1,2, … and J.
It should be understood by those skilled in the art that the gray compensation value of a single pixel of the jth frame image is the difference between the image gray value of the corresponding pixel of the jth frame image after being forward-biased in the image initialization stage and the reference gray value of the corresponding pixel, and the gray value of the pixel is pulled back to the normal pixel light response curve by compensating the gray value thereof.
In a specific embodiment, the compensating the gray value of each pixel of the jth frame image by using a single-pixel compensation method includes:
and compensating the gray value of each pixel of the image of the jth frame in a one-to-one correspondence manner according to the gray compensation value of each pixel of the jth frame, wherein J is 1,2, … and J, so as to realize more accurate image effect.
In a specific embodiment, the controlling the photosensor array to perform image capturing for a set number of frames at a first set illumination intensity includes: under the first set illumination intensity, controlling the photoelectric sensor array to acquire images with set frame numbers; under the second set illumination intensity, controlling the photoelectric sensor array to acquire images with set frame numbers; as shown in fig. 6, the curve of the gray-scale values of the single pixels of the first 50 frames of images of the corrected image 1 and the corrected image 2 collected under the first set illumination intensity and the second set illumination intensity is shown in fig. 7, which is the optical response curve of the photosensor. The method comprises the steps of collecting images of a sensor under two different illumination intensities in advance, and obtaining a light response curve of each pixel of the sensor for image processing and correction.
The obtaining of the gray reference value of each pixel according to the gray value of each pixel in the (N-M) th to N-th frame images acquired by the image acquisition of the set frame number comprises:
obtaining a first gray reference value of each pixel according to the gray value of each pixel in the (N-M) th to N (N-M) th frame images acquired by the image with the set frame number under the first set illumination intensity; obtaining a second gray level reference value of each pixel according to the gray level value of each pixel in the (N-M) -th to N-th frame images acquired by the images with the set frame number under the second set illumination intensity; specifically, N is 100, M is 50, the gray value of the image gradually tends to be stable after the image continuously acquires multiple frames, and the difference value between the gray value of the first frame of the image acquisition frame and the gray value of the image after the image is stable tends to be a stable numerical value.
Those skilled in the art will appreciate that 100 frames and 50 frames are merely examples, and may be set according to actual situations, and in order to eliminate temporal noise during image acquisition and achieve better image correction effect, hundreds of frames of images are often acquired continuously.
In a specific embodiment, the obtaining a gray compensation value of each pixel of the jth frame according to the gray value of each pixel in the jth frame image obtained by the image acquisition of the jth frame in the image acquisition of the set number of frames and the gray reference value of each pixel includes:
obtaining a first gray compensation value of each pixel of a jth frame according to a gray value of each pixel in a jth frame image obtained by image acquisition of a jth frame in image acquisition of the set frame number under a first set illumination intensity and a first gray reference value of each pixel;
obtaining a second gray compensation value of each pixel of a jth frame according to a gray value of each pixel in a jth frame image obtained by image acquisition of a jth frame in the image acquisition of the set frame number under a second set illumination intensity and a second gray reference value of each pixel; the gray compensation value of each pixel of the jth frame is obtained according to the first gray compensation value of each pixel of the jth frame and the second gray compensation value of each pixel of the jth frame, as shown in fig. 8, the photo-sensor optical response curve is stabilized by being pulled back after compensation, as shown in fig. 9, and the fingerprint images before and after gray value compensation are shown.
It should be noted that the gray value compensation value of each pixel in the image of the jth frame obtained by the image acquisition of the jth frame is an average value of the first gray compensation value and the second gray compensation value of each pixel of the jth frame.
It will be appreciated by those skilled in the art that third, fourth, etc. more gray scale compensation values may also be obtained at more set illumination intensities.
A second embodiment of the present invention provides an image capturing apparatus, including a controller and a photosensor array including a plurality of photosensors, the photosensors including photodiodes;
the controller is used for controlling the photoelectric sensor array to carry out image acquisition of at least one frame after the photodiode is subjected to forward bias.
In one possible implementation, the photosensor further includes a switching transistor connected to a cathode of the photodiode.
In one possible implementation, the photodiode is a PIN photodiode, and the switching Transistor is a Thin Film Transistor (TFT).
Further, the PIN photodiode is an amorphous silicon PIN photodiode, and the thin film transistor is an amorphous silicon thin film transistor.
It should be noted that the control flow and the control logic of the controller in the image capturing apparatus provided in this embodiment are similar to the image capturing control method provided in the first embodiment, and are not repeated herein.
As shown in fig. 10, a computer system suitable for implementing the controller in the image capturing apparatus provided in the above-described embodiment includes a central processing module (CPU) that can perform various appropriate actions and processes according to a program stored in a Read Only Memory (ROM) or a program loaded from a storage section into a Random Access Memory (RAM). In the RAM, various programs and data necessary for the operation of the computer system are also stored. The CPU, ROM, and RAM are connected thereto via a bus. An input/output (I/O) interface is also connected to the bus.
An input section including a keyboard, a mouse, and the like; an output section including a speaker and the like such as a Liquid Crystal Display (LCD); a storage section including a hard disk and the like; and a communication section including a network interface card such as a LAN card, a modem, or the like. The communication section performs communication processing via a network such as the internet. The drive is also connected to the I/O interface as needed. A removable medium such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is mounted on the drive as necessary, so that a computer program read out therefrom is mounted into the storage section as necessary.
In particular, the processes described in the above flowcharts may be implemented as computer software programs according to the present embodiment. For example, the present embodiments include a computer program product comprising a computer program tangibly embodied on a computer-readable medium, the computer program comprising program code for performing the method illustrated in the flow chart. In such an embodiment, the computer program may be downloaded and installed from a network via the communication section, and/or installed from a removable medium.
The flowchart and schematic diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to the present embodiments. In this regard, each block in the flowchart or schematic diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the schematic and/or flowchart illustration, and combinations of blocks in the schematic and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
On the other hand, the present embodiment also provides a nonvolatile computer storage medium, which may be the nonvolatile computer storage medium included in the apparatus in the foregoing embodiment, or may be a nonvolatile computer storage medium that exists separately and is not assembled into a terminal. The non-volatile computer storage medium stores one or more programs that, when executed by a device, cause the device to: forward biasing the photodiode; and controlling the photoelectric sensor array to acquire at least one frame of image.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It is further noted that, in the description of the present invention, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations and modifications can be made on the basis of the above description, and all embodiments cannot be exhaustive, and all obvious variations and modifications belonging to the technical scheme of the present invention are within the protection scope of the present invention.
Claims (14)
1. An image acquisition control method for a photosensor array comprising a plurality of photosensors, the photosensors comprising photodiodes, the method comprising:
forward biasing the photodiode; and
and controlling the photoelectric sensor array to acquire at least one frame of image.
2. The method of claim 1, wherein after said forward biasing said photodiode and before said controlling said photosensor array for at least one frame of image acquisition, said method further comprises:
the photodiode is reverse biased.
3. The method of claim 1, wherein after said forward biasing said photodiode and before said controlling said photosensor array for at least one frame of image acquisition, said method further comprises:
and controlling the photoelectric sensor array to perform image blank acquisition, wherein the duration of the image blank acquisition is less than the duration of image acquisition of one frame.
4. The method of claim 1, wherein after said forward biasing said photodiode and before said controlling said photosensor array for at least one frame of image acquisition, said method further comprises:
reverse biasing the photodiode; and
and controlling the photoelectric sensor array to perform image blank acquisition, wherein the duration of the image blank acquisition is less than the duration of image acquisition of one frame.
5. The method of any of claims 1-4, wherein prior to said forward biasing said photodiode, said method further comprises:
forward biasing the photodiode;
under a first set illumination intensity, controlling the photoelectric sensor array to acquire an image with a set frame number, wherein the set frame number is N;
acquiring a gray reference value of each pixel according to the gray value of each pixel in the (N-M) th to N (N-M) th frame images acquired by the image acquisition of the set frame number; and
obtaining a gray compensation value of each pixel of the jth frame according to the gray value of each pixel in the jth frame image obtained by the image acquisition of the jth frame in the image acquisition of the set frame number and the gray reference value of each pixel, wherein J is 1,2, …, J;
the controlling the photosensor array to perform at least one frame of image acquisition comprises: and after the jth frame image is acquired to obtain a jth frame image, compensating the gray value of each pixel of the jth frame image according to the gray compensation value of each pixel of the jth frame image.
6. The method according to claim 5, wherein the compensating the gray-scale value of each pixel of the jth frame image according to the gray-scale compensation value of each pixel of the jth frame image comprises:
and respectively compensating the gray value of each pixel of the image of the jth frame according to the average value of the gray compensation values of each pixel of the jth frame.
7. The method according to claim 5, wherein the compensating the gray-scale value of each pixel of the jth frame image according to the gray-scale compensation value of each pixel of the jth frame image comprises:
and compensating the gray value of each pixel of the image of the jth frame in a one-to-one correspondence manner according to the gray compensation value of each pixel of the jth frame.
8. The method of claim 5, wherein obtaining the gray reference value of each pixel according to the gray value of each pixel in the (N-M) -th to N-th frame images acquired by the image acquisition of the set frame number comprises:
and taking the gray value of each pixel in the (N-M) th to N-th frame images acquired by the image acquisition with the set frame number as the gray reference value of each pixel.
9. The method of claim 5,
under the first set light intensity, controlling the photoelectric sensor array to acquire the image with the set frame number comprises the following steps: under the first set illumination intensity, controlling the photoelectric sensor array to acquire images with set frame numbers; under the second set illumination intensity, controlling the photoelectric sensor array to acquire images with set frame numbers;
the obtaining of the gray reference value of each pixel according to the gray value of each pixel in the (N-M) th to N-th frame images acquired by the image acquisition of the set frame number comprises: obtaining a first gray reference value of each pixel according to the gray value of each pixel in the (N-M) th to N (N-M) th frame images acquired by the image with the set frame number under the first set illumination intensity; obtaining a second gray level reference value of each pixel according to the gray level value of each pixel in the (N-M) -th to N-th frame images acquired by the images with the set frame number under the second set illumination intensity;
obtaining a gray compensation value of each pixel of the jth frame according to the gray value of each pixel in the jth frame image obtained by the jth frame image acquisition in the jth frame image acquisition of the set frame number and the gray reference value of each pixel, comprises: obtaining a first gray compensation value of each pixel of a jth frame according to a gray value of each pixel in a jth frame image obtained by image acquisition of a jth frame in image acquisition of the set frame number under a first set illumination intensity and a first gray reference value of each pixel; obtaining a second gray compensation value of each pixel of a jth frame according to a gray value of each pixel in a jth frame image obtained by image acquisition of a jth frame in the image acquisition of the set frame number under a second set illumination intensity and a second gray reference value of each pixel; and obtaining the gray compensation value of each pixel of the jth frame according to the first gray compensation value of each pixel of the jth frame and the second gray compensation value of each pixel of the jth frame.
10. An image acquisition device, comprising a controller and a photosensor array comprising a plurality of photosensors, the photosensors comprising photodiodes;
the controller is used for controlling the photoelectric sensor array to carry out image acquisition of at least one frame after the photodiode is subjected to forward bias.
11. The image capture device of claim 10, wherein the photosensor further comprises a switching transistor connected to the negative electrode of the photodiode.
12. The image capturing device as claimed in claim 11, wherein the photodiode is a PIN photodiode, and the switching transistor is a thin film transistor.
13. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method according to any of claims 1-9 when executing the program.
14. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210007782.6A CN114363538A (en) | 2022-01-05 | 2022-01-05 | Image acquisition control method, image acquisition device, computer apparatus, and medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210007782.6A CN114363538A (en) | 2022-01-05 | 2022-01-05 | Image acquisition control method, image acquisition device, computer apparatus, and medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114363538A true CN114363538A (en) | 2022-04-15 |
Family
ID=81107730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210007782.6A Pending CN114363538A (en) | 2022-01-05 | 2022-01-05 | Image acquisition control method, image acquisition device, computer apparatus, and medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114363538A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109639990A (en) * | 2018-12-19 | 2019-04-16 | 上海箩箕技术有限公司 | The signal acquisition method and signal acquisition circuit of imaging sensor |
| CN110809146A (en) * | 2019-11-01 | 2020-02-18 | 厦门美图之家科技有限公司 | Image contrast adjusting method and device, terminal equipment and storage medium |
| US20200389612A1 (en) * | 2018-12-19 | 2020-12-10 | Shanghai Oxi Technology Co., Ltd | Method and Circuit for Signal Collection of Image Sensor |
| CN113257180A (en) * | 2021-06-08 | 2021-08-13 | 深圳市明微电子股份有限公司 | LED display screen, driving method and device thereof, and computer readable storage medium |
| CN113556488A (en) * | 2020-04-26 | 2021-10-26 | 上海箩箕技术有限公司 | Signal acquisition method and signal acquisition circuit of image sensor |
-
2022
- 2022-01-05 CN CN202210007782.6A patent/CN114363538A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109639990A (en) * | 2018-12-19 | 2019-04-16 | 上海箩箕技术有限公司 | The signal acquisition method and signal acquisition circuit of imaging sensor |
| US20200389612A1 (en) * | 2018-12-19 | 2020-12-10 | Shanghai Oxi Technology Co., Ltd | Method and Circuit for Signal Collection of Image Sensor |
| CN110809146A (en) * | 2019-11-01 | 2020-02-18 | 厦门美图之家科技有限公司 | Image contrast adjusting method and device, terminal equipment and storage medium |
| CN113556488A (en) * | 2020-04-26 | 2021-10-26 | 上海箩箕技术有限公司 | Signal acquisition method and signal acquisition circuit of image sensor |
| CN113257180A (en) * | 2021-06-08 | 2021-08-13 | 深圳市明微电子股份有限公司 | LED display screen, driving method and device thereof, and computer readable storage medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111033193B (en) | Detecting high intensity light in a photosensor | |
| EP1397911B1 (en) | Photosensor system and drive control method thereof | |
| US6307195B1 (en) | Variable collection of blooming charge to extend dynamic range | |
| EP1096789B1 (en) | Cmos image sensor with extended dynamic range | |
| EP1582054B1 (en) | Cmos active pixel with hard and soft reset | |
| EP3182154A1 (en) | Spad array with pixel-level bias control | |
| US20030223532A1 (en) | Method, processor and computed tomography (CT) machine for generating images utilizing high and low sensitivity DATA collected from a flat panel detector having an extended dynamic range | |
| CN108886594B (en) | Digital unit cell with analog counter element | |
| EP0833505A2 (en) | Fast scan reset for a large area X-ray detector | |
| US7768563B2 (en) | Method and circuit for determining the response curve knee point in active pixel image sensors with extended dynamic range | |
| EP3354012B1 (en) | Imaging system unit cell and methods for dynamic range imaging | |
| EP1475957B1 (en) | Method and apparatus for removing column fixed pattern noise in solid state image sensors | |
| CN109639990B (en) | Signal acquisition method and signal acquisition circuit of image sensor | |
| JP2003256820A (en) | Image reading device and its sensitivity setting method | |
| JP3455761B2 (en) | Photosensor system sensitivity adjustment apparatus and sensitivity adjustment method | |
| US20040223065A1 (en) | Wide dynamic range active pixel with knee response | |
| JP2003087656A (en) | X-ray image diagnostic device | |
| US20040256567A1 (en) | Radiographic apparatus and radiographic method | |
| JP3999522B2 (en) | Solid-state imaging device | |
| CN114363538A (en) | Image acquisition control method, image acquisition device, computer apparatus, and medium | |
| US20120194881A1 (en) | Image sensing apparatus | |
| JP4081641B2 (en) | Sensitivity adjustment apparatus for two-dimensional image reading apparatus and sensitivity adjustment method thereof | |
| US8130289B2 (en) | System, method, and apparatus for correction of dark current error in semiconductor imaging devices | |
| CN113196281A (en) | Fingerprint identification detection circuit and method and display device | |
| US20230051657A1 (en) | Self calibrating barrier modulation pixel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |