CN108683861A - Shooting exposure control method and device, imaging device and electronic device - Google Patents

Abstract

The application provides a shooting exposure control method, a shooting exposure control device, an imaging device and an electronic device, wherein the method is used for the imaging device, the imaging device comprises a pixel unit array composed of a plurality of photosensitive pixels, and the method comprises the following steps: controlling each photosensitive pixel in the pixel unit array to measure the environmental brightness value; determining an environment brightness value corresponding to each area of the pixel unit array according to the measurement result of the environment brightness value; and controlling the photosensitive pixels in each area to shoot by adopting a corresponding exposure mode according to the environment brightness value measured in each area. The method can be used for carrying out the partitioned exposure treatment on the pixel unit array, namely controlling the photosensitive pixels in each area to shoot by adopting a proper exposure mode according to the environment brightness value measured in each area, so that the signal-to-noise ratio of a darker area in a picture can be improved, a target image with better definition can be obtained, and the shooting experience of a user can be improved.

Description

Shooting exposure control method, device, imaging device and electronic device

technical field

The present application relates to the technical field of electronic equipment, and in particular to a shooting exposure control method, device, imaging equipment and electronic equipment.

Background technique

With the continuous development of terminal technologies, more and more users use electronic devices to capture images. In a dark environment, when the user uses the front camera of the electronic device to take a selfie, since the user is between the light source and the electronic device, insufficient exposure of the face may easily occur. If the brightness of the face is increased by adjusting the exposure, the background area will be overexposed, and the scene of the selfie cannot even be seen clearly.

In the prior art, the high dynamic range (HDR) technology is used to control the pixel array to sequentially expose and output multi-frame images with different exposure times, and then fuse the multi-frame images to calculate the high dynamic range, so as to improve the facial and facial features. The imaging effect of the background area.

However, the image obtained by using this method in a dark light environment has more noise, and the clarity and contrast are not good.

Contents of the invention

The present application proposes a shooting exposure control method, device, imaging equipment and electronic equipment, which are used to solve the technical problems in the prior art that there are many image noises and poor definition and contrast.

An embodiment of the present application proposes a shooting exposure control method for an imaging device, the imaging device includes a pixel unit array composed of a plurality of photosensitive pixels, and the shooting exposure control method includes:

controlling each photosensitive pixel in the pixel unit array to measure the ambient brightness value;

According to the measurement result of the ambient brightness value, determine the ambient brightness value corresponding to each area of the pixel unit array; wherein, each area is obtained by dividing the pixel unit array, and each area includes at least one photosensitive pixel;

According to the ambient brightness value measured in each area, the photosensitive pixels in each area are controlled to use the corresponding exposure mode to shoot.

In the shooting exposure control method of the embodiment of the present application, each photosensitive pixel in the pixel unit array is controlled to measure the ambient brightness value, and then according to the measurement result of the ambient brightness value, the ambient brightness value corresponding to each area of the pixel unit array is determined; wherein, each The area is obtained by dividing the pixel unit array into areas, and each area contains at least one photosensitive pixel. Finally, according to the ambient brightness value measured in each area, the photosensitive pixels in each area are controlled to use the corresponding exposure mode to shoot. In this application, by performing partition exposure processing on the pixel unit array, that is, according to the ambient brightness value measured in each area, control the photosensitive pixels in each area to use an appropriate exposure mode to shoot, which can improve the signal of the darker area in the picture. Noise ratio, to obtain a clearer target image and improve the user's shooting experience.

In yet another aspect of the present application, an embodiment proposes a shooting exposure control device for use in an imaging device, where the imaging device includes a pixel unit array composed of a plurality of photosensitive pixels, and the shooting exposure control device includes:

A measurement module, configured to control each photosensitive pixel in the pixel unit array to measure the ambient brightness value;

A determining module, configured to determine the ambient brightness value corresponding to each region of the pixel unit array according to the measurement result of the ambient brightness value; wherein, each region is obtained by dividing the pixel unit array into regions, and each region includes at least one photosensitive pixel;

The control module is used to control the photosensitive pixels in each area to use the corresponding exposure mode to take pictures according to the ambient brightness values measured in each area.

The shooting exposure control device of the embodiment of the present application measures the ambient brightness value by controlling each photosensitive pixel in the pixel unit array, and then determines the ambient brightness value corresponding to each area of the pixel unit array according to the measurement result of the ambient brightness value; wherein, each The area is obtained by dividing the pixel unit array into areas, and each area contains at least one photosensitive pixel. Finally, according to the ambient brightness value measured in each area, the photosensitive pixels in each area are controlled to use the corresponding exposure mode to shoot. In this application, by performing partition exposure processing on the pixel unit array, that is, according to the ambient brightness value measured in each area, control the photosensitive pixels in each area to use an appropriate exposure mode to shoot, which can improve the signal of the darker area in the picture. Noise ratio, to obtain a clearer target image and improve the user's shooting experience.

Another aspect of the present application provides an embodiment of an imaging device, the imaging device includes a pixel unit array composed of a plurality of photosensitive pixels, the imaging device further includes a processor, and the processor is used for:

controlling each photosensitive pixel in the pixel unit array to measure the ambient brightness value;

According to the measurement result of the ambient brightness value, determine the ambient brightness value corresponding to each area of the pixel unit array; wherein, each area is obtained by dividing the pixel unit array, and each area includes at least one photosensitive pixel;

According to the ambient brightness value measured in each area, the photosensitive pixels in each area are controlled to use the corresponding exposure mode to shoot.

The imaging device of the embodiment of the present application measures the ambient brightness value by controlling each photosensitive pixel in the pixel unit array, and then determines the ambient brightness value corresponding to each area of the pixel unit array according to the measurement result of the ambient brightness value; wherein, each area is The pixel unit array is divided into regions, and each region contains at least one photosensitive pixel. Finally, according to the ambient brightness value measured in each region, the photosensitive pixels in each region are controlled to use the corresponding exposure mode to shoot. In this application, by performing partition exposure processing on the pixel unit array, that is, according to the ambient brightness value measured in each area, control the photosensitive pixels in each area to use an appropriate exposure mode to shoot, which can improve the signal of the darker area in the picture. Noise ratio, to obtain a clearer target image and improve the user's shooting experience.

Yet another embodiment of the present application proposes an electronic device, including: a memory, a processor, and a computer program stored on the memory and operable on the processor. When the processor executes the program, it realizes the The shooting exposure control method proposed in the foregoing embodiments.

Yet another embodiment of the present application provides a computer-readable storage medium on which a computer program is stored, wherein when the program is executed by a processor, the shooting exposure control method as proposed in the foregoing embodiments of the present application is implemented.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Description of drawings

The above and/or additional aspects and advantages of the present application will become apparent and easy to understand from the following description of the embodiments in conjunction with the accompanying drawings, wherein:

FIG. 1 is a schematic flow chart of a shooting exposure control method provided in Embodiment 1 of the present application;

FIG. 2 is a schematic flow chart of the shooting exposure control method provided in Embodiment 2 of the present application;

FIG. 3 is a schematic flow chart of a shooting exposure control method provided in Embodiment 3 of the present application;

FIG. 4 is a schematic flow chart of a shooting exposure control method provided in Embodiment 4 of the present application;

FIG. 5 is a schematic flow chart of a shooting exposure control method provided in Embodiment 5 of the present application;

FIG. 6 is a schematic structural diagram of a photographing exposure control device provided in Embodiment 6 of the present application;

FIG. 7 is a schematic structural diagram of a shooting exposure control device provided in Embodiment 7 of the present application;

Fig. 8 is a schematic block diagram of an electronic device according to some embodiments of the present application.

FIG. 9 is a block diagram of an image processing circuit in some embodiments of the present application.

Detailed ways

Embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary, and are intended to explain the present application, and should not be construed as limiting the present application.

The present application mainly aims at the technical problems in the prior art that there are many image noises and poor definition and contrast, and provides a shooting exposure control method.

In the shooting exposure control method of the embodiment of the present application, each photosensitive pixel in the pixel unit array is controlled to measure the ambient brightness value, and then according to the measurement result of the ambient brightness value, the ambient brightness value corresponding to each area of the pixel unit array is determined; wherein, each The area is obtained by dividing the pixel unit array into areas, and each area contains at least one photosensitive pixel. Finally, according to the ambient brightness value measured in each area, the photosensitive pixels in each area are controlled to use the corresponding exposure mode to shoot. In this application, by performing partition exposure processing on the pixel unit array, that is, according to the ambient brightness value measured in each area, control the photosensitive pixels in each area to use an appropriate exposure mode to shoot, which can improve the signal of the darker area in the picture. Noise ratio, to obtain a clearer target image and improve the user's shooting experience.

The shooting exposure control method, device, imaging device and electronic device according to the embodiments of the present application will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic flow chart of a shooting exposure control method provided in Embodiment 1 of the present application.

The shooting exposure control method of the embodiment of the present application is used in an imaging device, and the imaging device includes a pixel unit array composed of a plurality of photosensitive pixels.

As shown in FIG. 1, the shooting exposure control method includes the following steps:

Step 101, controlling each photosensitive pixel in the pixel unit array to measure the ambient brightness value.

In the embodiment of the present application, each photosensitive pixel in the pixel unit array is controlled to measure the ambient brightness value, and the measurement result of the ambient brightness value can be obtained, that is, the ambient brightness value measured by each photosensitive pixel can be obtained.

Step 102, according to the measurement result of the ambient brightness value, determine the ambient brightness value corresponding to each area of the pixel unit array; wherein each area is obtained by dividing the pixel unit array, and each area includes at least one photosensitive pixel.

It can be understood that different photosensitive pixels are used to measure ambient brightness values in different areas in the current shooting environment, and the ambient brightness values measured by different photosensitive pixels may be different. In order to improve the exposure processing effect of captured images, in this application, the pixel unit array can be divided into regions to obtain each region in the pixel unit array, so that subsequent exposure processing can be performed for each region using a corresponding exposure processing strategy.

As a possible implementation of the embodiment of the present application, the pixel unit array may be divided into regions according to the ambient brightness value measured by each photosensitive pixel in the pixel unit array. Specifically, photosensitive pixels in the pixel unit array with similar measured ambient brightness values may be divided into the same area, that is, photosensitive pixels belonging to the same area have similar measured ambient brightness values. After each region in the pixel unit array is determined, for each region, the ambient brightness value corresponding to the region can be determined according to the ambient brightness value measured by each photosensitive pixel in the region. For example, the average value of the ambient brightness values measured by the photosensitive pixels in the area can be calculated, and the average value can be used as the ambient brightness value corresponding to the area, or, because the ambient brightness values measured by the photosensitive pixels in the area are similar, Therefore, the maximum value or the minimum value of the ambient brightness values measured by the photosensitive pixels in the area may be used as the ambient brightness value corresponding to the area, without limitation.

As another possible implementation of the embodiment of the present application, the pixel unit array can be fixedly divided into regions in advance, and then the ambient brightness corresponding to each region of the pixel unit array can be determined according to the ambient brightness value measured by each photosensitive pixel in the same region value. For example, for each area, the average value of the ambient brightness values measured by the photosensitive pixels in the area can be calculated, and the average value can be used as the ambient brightness value corresponding to the area, or other algorithms can be used to determine the corresponding ambient brightness value of the area. Ambient brightness value, without limitation.

Step 103 , according to the ambient brightness values measured in each area, control the photosensitive pixels in each area to use the corresponding exposure mode to take pictures.

In the embodiment of the present application, the exposure mode may specifically be divided into a bright light mode and a dark light mode, where the bright light mode and the dark light mode correspond to a bright environment and a dark environment, respectively.

It is understandable that the ambient brightness values measured in different areas may be different. If the same exposure mode is used for shooting, for example, both are shot in bright light mode, underexposure may occur for areas with lower measured ambient brightness values. However, the low-light mode is used for shooting, and overexposure may occur in areas where the measured ambient brightness value is high. Therefore, in this application, in order to improve the exposure effect of the captured target image, the exposure modes corresponding to different regions may be different. After the ambient brightness values measured in each area are determined, the photosensitive pixels in each area can be controlled to use a corresponding exposure mode to shoot, so as to obtain a target image.

Specifically, for an area where the measured ambient brightness value is low, the photosensitive pixels in this area can be controlled to shoot in dark light mode to obtain the target image, and for an area where the measured ambient brightness value is high, the area can be controlled to The light-sensitive pixels inside are shot in bright light mode to obtain the target image. It can be understood that the image quality of the target image captured in the bright light mode is better in a bright environment, and similarly, the image quality of the target image captured in the dim light mode is better in a dim environment.

In the shooting exposure control method of the embodiment of the present application, each photosensitive pixel in the pixel unit array is controlled to measure the ambient brightness value, and then according to the measurement result of the ambient brightness value, the ambient brightness value corresponding to each area of the pixel unit array is determined; wherein, each The area is obtained by dividing the pixel unit array into areas, and each area contains at least one photosensitive pixel. Finally, according to the ambient brightness value measured in each area, the photosensitive pixels in each area are controlled to use the corresponding exposure mode to shoot. In this application, by performing partition exposure processing on the pixel unit array, that is, according to the ambient brightness value measured in each area, control the photosensitive pixels in each area to use an appropriate exposure mode to shoot, which can improve the signal of the darker area in the picture. Noise ratio, to obtain a clearer target image and improve the user's shooting experience.

As a possible implementation, referring to FIG. 2, on the basis of the embodiment shown in FIG. 1, step 103 may specifically include the following sub-steps:

In step 201, a gain index value is obtained according to an ambient brightness value and a preset target brightness value.

In the embodiment of the present application, for each area in the pixel unit array, the gain index value can be obtained by comparing the ambient brightness value of the area with the preset target brightness value, wherein the gain index value is used to represent the brightness in each area. The brightness and darkness of the environment measured by the photosensitive pixels, and the gain index value corresponds to the gain value of the imaging device. When the ambient brightness value measured in this area is lower than the target brightness value, it means that a larger gain value needs to be provided for the imaging device at this time, and correspondingly, the gain index value also needs to be larger, and at this time, the photosensitive pixel detects less light , the generated level signal is also small, and a larger gain value is needed to increase the level signal to be used in the calculation of the subsequent target image. Therefore, when the gain index value is large, it indicates that the photosensitive pixels in this area measure The brightness of the environment is relatively dark; and when the ambient brightness value is greater than the target brightness value, it means that a smaller gain value needs to be provided for the imaging device at this time, correspondingly, the gain index value is also smaller, and the photosensitive pixels detect more light, the generated level signal is also relatively large, and only a small gain value is needed to increase the level signal for subsequent target image calculations. Therefore, when the gain index value is small, it indicates that the photosensitive pixels in this area The brightness of the measured environment is bright.

In a specific embodiment of the present application, the difference value between the ambient brightness value and the target brightness value, the gain value and the gain index value have a one-to-one correspondence relationship, and the correspondence relationship is pre-stored in the exposure table. After the ambient brightness value is obtained, the matching gain index value can be found in the exposure table according to the difference between the ambient brightness value and the target brightness value.

Step 202, when the gain index value is smaller than the preset gain index value, use bright light mode to shoot to obtain the target image.

Step 203, when the gain index value is greater than the preset gain index value, use dark light mode to shoot to obtain the target image.

In the shooting exposure control method of the embodiment of the present application, a preset gain index value may be preset, and in a specific embodiment of the present application, the preset gain index value is 460. Certainly, in other implementation manners, the preset gain index value may also be other values. After obtaining the gain index value corresponding to the ambient brightness value, the gain index value can be compared with the preset gain index value. If the gain index value is smaller than the preset gain index value, it indicates that the brightness of the current shooting environment is relatively high. When , the electrical signal obtained by each photosensitive pixel is strong and the noise is small, and the target image can be kept in the bright light mode (the imaging device works in the bright light mode by default when it is turned on), if the gain index value is greater than the preset gain index value , it indicates that the brightness of the current shooting environment is low. At this time, the electrical signal obtained by each photosensitive pixel is weak and the noise is large. You can switch to the dark light mode to shoot the target image.

It can be understood that the image quality of the target image captured in the bright light mode is better in a bright environment, and similarly, the image quality of the target image captured in the dim light mode is better in a dark environment.

Step 204, when the gain index value is equal to the preset gain index value, use bright mode or dark mode to shoot to obtain the target image.

In the embodiment of the present application, when the gain index value is equal to the preset gain index value, the imaging device may use the bright light mode to capture the target image, or may use the dark light mode to capture the image. Further, when the working mode of the imaging device at a certain moment is the bright light mode, and the acquired gain index value at this moment is equal to the preset gain index value, it directly keeps working in the bright light mode. When the working mode of the imaging device at a certain moment is the dark light mode, and the gain index value obtained at this moment is equal to the preset gain index value, it directly keeps working in the dark light mode. In this way, the problem of high energy consumption caused by frequent switching of working modes of the imaging device can be avoided.

The shooting exposure control method of the embodiment of the present application judges the brightness and darkness of the environment measured by the photosensitive pixels in each area by obtaining the gain index value representing the brightness and darkness of the environment, and further selects an appropriate working mode according to the judgment result to obtain a better imaging effect. The best target image can improve the user's shooting experience.

As a possible implementation of the embodiment of the present application, referring to FIG. 3, shooting in bright light mode to obtain a target image includes the following steps:

Step 301 , controlling the pixel unit array to output a plurality of original pixel information under different exposure times.

In the embodiment of the present application, the photosensitive pixels may include a plurality of long exposure pixels, a plurality of medium exposure pixels and a plurality of short exposure pixels, wherein the long exposure pixel refers to that the exposure time corresponding to the photosensitive pixel is the long exposure time, and the medium exposure pixel It means that the exposure time corresponding to the photosensitive pixel is the medium exposure time, and the short exposure pixel refers to the exposure time corresponding to the photosensitive pixel is the short exposure time, long exposure time>medium exposure time>short exposure time, that is, the long exposure time of the long exposure pixel The time is greater than the medium exposure time of the medium exposure pixels, and the medium exposure time of the medium exposure pixels is greater than the short exposure time of the short exposure pixels. When the imaging device is working, the long-exposure pixels, the medium-exposure pixels and the short-exposure pixels are exposed synchronously, and the synchronous exposure means that the exposure time of the medium-exposure pixels and the short-exposure pixels is within the exposure time of the long-exposure pixels.

Specifically, it is possible to firstly control the exposure of the long-exposure pixel first, and then control the exposure of the medium-exposure pixel and the short-exposure pixel during the exposure period of the long-exposure pixel, wherein the exposure cut-off time of the medium-exposure pixel and the short-exposure pixel should be the same as that of the long-exposure pixel. The exposure cut-off time of the exposure pixels is the same or before the exposure cut-off time of the long-exposure pixels; or, control the long-exposure pixels, medium-exposure pixels and short-exposure pixels to start exposure at the same time, that is, the exposure of the long-exposure pixels, medium-exposure pixels and short-exposure pixels The start time is the same. In this way, there is no need to control the pixel unit array to sequentially perform long exposure, medium exposure and short exposure, which can reduce the shooting time of the target image.

When the imaging device works in the bright light mode, the imaging device first controls the synchronous exposure of the long-exposure pixels, medium-exposure pixels and short-exposure pixels in each photosensitive pixel in the pixel unit array, wherein the exposure time corresponding to the long-exposure pixels is the initial long exposure time. Exposure time, the exposure time corresponding to the medium exposure pixel is the initial medium exposure time, the exposure time corresponding to the short exposure pixel is the initial short exposure time, the initial long exposure time, the initial medium exposure time and the initial short exposure time are all preset . After the exposure is over, each photosensitive pixel in the pixel unit array will output a plurality of original pixel information under different exposure times.

Step 302 : Calculate combined pixel information according to the original pixel information of the same photosensitive pixel with the same exposure time.

Step 303, outputting the target image according to the merged pixel information.

For example, when each photosensitive pixel includes 1 long-exposure pixel, 2 medium-exposure pixels, and 1 short-exposure pixel, the original pixel information of the only long-exposure pixel is the long-exposure merged pixel information, and the 2 medium-exposure pixels The sum of the original pixel information of the pixels is the combined pixel information of the medium exposure, and the original pixel information of the only short-exposure pixel is the combined pixel information of the short exposure; when each photosensitive pixel includes 2 long-exposure pixels and 4 medium-exposure pixels When there are two exposure pixels and two short exposure pixels, the sum of the original pixel information of the two long exposure pixels is the combined pixel information of the long exposure, and the sum of the original pixel information of the four medium exposure pixels is the combined pixel information of the medium exposure. The sum of the original pixel information of the two short-exposure pixels is short-exposure merged pixel information. In this way, multiple long-exposure combined pixel information, multiple medium-exposure combined pixel information, and multiple short-exposure combined pixel information of the entire pixel unit array can be obtained.

Then, according to the interpolation calculation of the combined pixel information of multiple long exposures, the long exposure sub-image is obtained, the interpolation calculation of the combined pixel information of multiple medium exposures is used to obtain the medium exposure sub-image, and the short exposure sub-image is obtained according to the interpolation calculation of the combined pixel information of multiple short exposures. Expose the sub-image. Finally, the long-exposure sub-image, medium-exposure sub-image and short-exposure sub-image are fused to obtain a target image with high dynamic range. The long-exposure sub-image, medium-exposure sub-image and short-exposure sub-image are not three The frame image is the image part formed by the corresponding areas of the long, short, and medium exposure pixels in the same frame image.

Alternatively, after the exposure of the pixel unit array ends, the original pixel information of the short-exposure pixels and the original pixel information of the medium-exposure pixels may be superimposed on the original pixel information of the long-exposure pixels based on the original pixel information output by the long-exposure pixels. Specifically, for the same photosensitive pixel, different weights can be assigned to the original pixel information of three different exposure times, and after multiplying the original pixel information corresponding to each exposure time The subsequent raw pixel information is added as the synthetic pixel information of a photosensitive pixel. Subsequently, since the gray level of each synthesized pixel information calculated according to the original pixel information of three different exposure times will change, therefore, after obtaining the synthesized pixel information, it is necessary to compress the gray level of each synthesized pixel information . After the compression is completed, the target image can be obtained by performing interpolation calculation according to the synthesized pixel information obtained after the compression. In this way, the dark part of the target image has been compensated by the original pixel information output by the long-exposure pixels, and the bright part has been suppressed by the original pixel information output by the short-exposure pixels. High dynamic range and better imaging effect.

Furthermore, in order to further improve the imaging quality of the target image, after the long-exposure pixels, medium-exposure pixels, and short-exposure pixels are exposed synchronously according to the initial long exposure time, initial medium exposure time, and initial short exposure time respectively, the long-exposure pixel The output raw pixel information calculates the long exposure histogram, calculates the short exposure histogram according to the original pixel information output by the short exposure pixel, and corrects the initial long exposure time according to the long exposure histogram to obtain the corrected long exposure time, corrects the initial exposure time according to the short exposure histogram Short exposure times get corrected for short exposure times. Subsequently, the long-exposure pixels, the medium-exposure pixels and the short-exposure pixels are controlled to be exposed synchronously according to the corrected long exposure time, the initial medium exposure time and the corrected short exposure time respectively. Among them, the correction process is not in place in one step, but the imaging device needs to perform multiple long, medium and short simultaneous exposures. After each simultaneous exposure, the imaging device will continue to correct according to the generated long exposure histogram and short exposure histogram. Long exposure time and short exposure time, and use the corrected long exposure time, corrected short exposure time and original medium exposure time corrected at the previous moment for synchronous exposure in the next exposure, and continue to obtain the long exposure histogram and short exposure histogram, Repeat this cycle until there is no underexposed area in the image corresponding to the long exposure histogram and no overexposed area in the image corresponding to the short exposure histogram. At this time, the corrected long exposure time and corrected short exposure time are the final corrections. Long exposure time and corrected short exposure time. After the exposure is over, the calculation of the target image is performed according to the outputs of the long-exposure pixels, medium-exposure pixels and short-exposure pixels.

Wherein, there may be one or more long-exposure histograms. When there is one long-exposure histogram, one long-exposure histogram can be generated according to the original pixel information output by all long-exposure pixels. When there are multiple long-exposure histograms, the long-exposure pixels can be divided into regions, and a long-exposure histogram can be generated according to the original pixel pixels of multiple long-exposure images in each region. In this way, multiple regions correspond to multiple long-exposure histograms. Exposure histogram. The function of dividing the area is to improve the accuracy of the long exposure time of each correction and speed up the correction process of the long exposure time. Likewise, there may be one or more short exposure histograms. When there is one short-exposure histogram, one short-exposure histogram may be generated according to the original pixel information output by all short-exposure pixels. When there are multiple short-exposure histograms, the short-exposure pixels can be divided into regions, and a short-exposure histogram can be generated according to the original pixel information of multiple short-exposure pixels in each region, so that multiple regions correspond to multiple short-exposure histogram. The role of dividing the area is to improve the accuracy of the short exposure time of each correction and speed up the correction process of the short exposure time.

As a possible implementation, referring to FIG. 4, on the basis of the embodiment shown in FIG. 3, step 302 may specifically include the following sub-steps:

Step 401, in the same photosensitive pixel, select the original pixel information of the long-exposure pixel, the original pixel information of the short-exposure pixel or the original pixel information of the medium-exposure pixel.

In the embodiment of the present application, in the same photosensitive pixel, the original pixel information of the long-exposure pixel, the original pixel information of the short-exposure pixel, or the original pixel information of the medium-exposure pixel are selected, that is, the original pixel information of the long-exposure pixel, the short-exposure pixel Select an original pixel information from the original pixel information of the exposed pixel or the original pixel information of the middle exposure pixel.

For example, when a photosensitive pixel includes 1 long-exposure pixel, 2 medium-exposure pixels, and 1 short-exposure pixel, and the original pixel information of the long-exposure pixel is 80, the original pixel information of the two medium-exposure pixels is 255, and the When the original pixel information of the exposed pixel is 255, since 255 is the upper limit of the original pixel information, the selected original pixel information of the long-exposure pixel: 80.

Step 402, according to the selected original pixel information, and the exposure ratio among the long exposure time, medium exposure time and short exposure time, calculate and obtain the merged pixel information.

Still taking the above example as an example, assuming that the exposure ratio among the long exposure time, the medium exposure time and the short exposure time is: 16:4:1, then the combined pixel information is: 80*16=1280.

Since the upper limit of the original pixel information in the prior art is 255, the dynamic range can be extended by calculating the merged pixel information according to the selected original pixel information and the exposure ratio between the long exposure time, medium exposure time and short exposure time, A high dynamic range image is obtained, thereby improving the imaging effect of the target image.

As a possible implementation of the embodiment of the present application, referring to FIG. 5, shooting in dark light mode to obtain a target image includes the following steps:

Step 501, controlling the pixel unit array to output a plurality of original pixel information obtained by exposure with the same exposure time.

When the imaging device works in the dark light mode, the imaging device first controls the synchronous exposure of the long-exposure pixels, medium-exposure pixels and short-exposure pixels in each photosensitive pixel in the pixel unit array, and the exposure time of each exposure pixel is the same, that is The exposure cut-off time of the long-exposure pixel, the medium-exposure pixel, and the short-exposure pixel is also the same. After the exposure is over, each photosensitive pixel in the pixel unit array will output a plurality of original pixel information obtained by exposure with the same exposure time. For example, when each photosensitive pixel includes: 1 long-exposure pixel, 2 medium-exposure pixels, and 1 short-exposure pixel, each photosensitive pixel in the pixel unit array will output four original pixel information, that is, 1 long-exposure pixel 1 original pixel information output by the pixel, 2 original pixel information output by the 2 medium exposure pixels, and 1 original pixel information output by the 1 and short exposure pixels.

In step 502, the original pixel information in the same photosensitive pixel is calculated to obtain combined pixel information, and each photosensitive pixel corresponds to a combined pixel information.

In the embodiment of the present application, the original pixel information in the same photosensitive pixel is combined and calculated to obtain a plurality of combined pixel information. Specifically, for each photosensitive pixel in the pixel unit array, the original pixel information in the photosensitive pixel can be An average value is calculated, and the calculated average value is used as combined pixel information of the photosensitive pixel.

Still taking the above example as an example, mark the four original pixel information output by the photosensitive pixel, that is, one original pixel information output by one long-exposure pixel, two original pixel information output by two medium-exposure pixels, and one short-exposure pixel The output original pixel information is: R1, R2, R3 and R4 respectively, then the combined pixel information of the photosensitive pixel is: (R1+R2+R3+R4)/4.

Step 503, outputting a target image according to multiple pieces of combined pixel information.

In the embodiment of the present application, after the multiple combined pixel information of the multiple photosensitive pixels in the entire pixel unit array is calculated, the target image may be obtained through interpolation calculation according to the multiple combined pixel information.

It can be understood that, in the bright light mode, the target image is obtained by using raw pixel information output by the pixel unit array at three different exposure times. Since the target image is composed of pixel information with long, medium, and short exposure times, the target image that can be acquired in bright light mode has a higher dynamic range. However, bright light mode is only suitable for scenes with high ambient light. When the ambient brightness is high, the medium exposure pixels can be exposed normally, the long exposure pixels can correct the underexposed part in the medium exposure image, and the short exposure pixels can correct the overexposed part in the medium exposure image, so as to obtain the target image with high dynamic range . However, if the bright light mode is used to take pictures when the ambient brightness value is low, neither the long-exposure pixels nor the medium-exposure pixels can obtain sufficient exposure, and the target image captured in bright light mode has more noise, poor contrast and clarity. The dark light mode is to combine and calculate multiple original pixel information in the same photosensitive pixel. When the ambient brightness is low, using the dark light mode to acquire the target image will reduce the resolution of the target image, but each pixel in the target image The pixel information is obtained by combining the original pixel information of multiple photosensitive pixels. Compared with the bright mode, the brightness of the target image acquired in the dark mode is twice the brightness of the target image acquired in the bright mode. Therefore, the effect of the target image acquired using the low light mode is better when the ambient brightness is low.

Therefore, the shooting exposure control method of the embodiment of the present application judges the brightness and darkness of the environment measured in each area according to the gain index value. mode to capture target images with a high dynamic range. For areas where the measured ambient brightness value is low, the photosensitive pixels in this area can be controlled to use the dark light mode to capture target images with less noise and higher brightness. In this way, the target images obtained under different ambient brightnesses all have better shooting effects.

In order to realize the above embodiments, the present application further proposes a shooting exposure control device.

FIG. 6 is a schematic structural diagram of a shooting exposure control device provided in Embodiment 6 of the present application.

The shooting exposure control device of the embodiment of the present application is used in an imaging device, and the imaging device includes a pixel unit array composed of a plurality of photosensitive pixels.

As shown in FIG. 6 , the shooting exposure control device 100 includes: a measurement module 110 , a determination module 120 , and a control module 130 . in,

The measurement module 110 is configured to control each photosensitive pixel in the pixel unit array to measure the ambient brightness value.

The determination module 120 is configured to determine the ambient brightness value corresponding to each region of the pixel unit array according to the measurement result of the ambient brightness value; wherein each region is obtained by dividing the pixel unit array into regions, and each region includes at least one photosensitive pixel.

The control module 130 is configured to control the photosensitive pixels in each area to adopt a corresponding exposure mode to take pictures according to the ambient brightness values measured in each area.

Further, in a possible implementation of the embodiment of the present application, referring to FIG. 7 , on the basis of the embodiment shown in FIG. 6 , the shooting exposure control device 100 may further include:

As a possible implementation, the control module 130 includes:

The acquiring sub-module 131 is configured to acquire the gain index value according to the ambient brightness value and the preset target brightness value.

The bright light mode shooting sub-module 132 is configured to use bright light mode to shoot to obtain the target image when the gain index value is less than the preset gain index value.

As a possible implementation, the photosensitive pixels include multiple long-exposure pixels, multiple medium-exposure pixels, and multiple short-exposure pixels, and the bright light mode shooting sub-module 132 includes:

The control unit 1321 is used to control the pixel unit array to output a plurality of original pixel information under different exposure times; wherein, the long exposure time of the long exposure pixel is greater than the medium exposure time of the medium exposure pixel, and the medium exposure time of the medium exposure pixel Shorter exposure times than short-exposure pixels.

The calculating unit 1322 is configured to calculate combined pixel information according to the original pixel information of the same photosensitive pixel with the same exposure time.

As a possible implementation, the calculation unit 1322 is specifically configured to: select the original pixel information of the long-exposure pixel, the original pixel information of the short-exposure pixel, or the original pixel information of the medium-exposure pixel in the same photosensitive pixel; The original pixel information, and the exposure ratio among the long exposure time, medium exposure time and short exposure time are calculated to obtain the merged pixel information.

The output unit 1323 is configured to output the target image according to the merged pixel information.

The dark light mode shooting sub-module 133 is used for shooting in dark light mode to obtain the target image when the gain index value is greater than the preset gain index value.

As a possible implementation, the sub-module 133 in dark light mode includes:

The control unit 1331 is configured to control the pixel unit array to output a plurality of original pixel information obtained by exposure with the same exposure time.

The calculation unit 1332 is configured to calculate combined pixel information from the original pixel information in the same photosensitive pixel, and each photosensitive pixel corresponds to a combined pixel information.

As a possible implementation manner, the calculation unit 1332 is specifically configured to: calculate an average value of original pixel information in the same photosensitive pixel to obtain combined pixel information.

An output unit 1333, configured to output a target image according to a plurality of combined pixel information.

Optionally, the control module 130 also includes:

The bright light or dark light mode shooting sub-module 134 is used for shooting in bright light mode or dark light mode to obtain the target image when the gain index value is equal to the preset gain index value.

As a possible implementation, the determination module 120 is specifically configured to: divide the pixel unit array into regions according to the ambient brightness value measured by each photosensitive pixel in the pixel unit array; where the photosensitive pixels belonging to the same region are measured to obtain The ambient brightness values are similar; the ambient brightness values corresponding to each area of the pixel unit array are determined according to the ambient brightness values measured by each photosensitive pixel in the same area.

As another possible implementation, the determination module 120 is specifically used to: determine the fixedly divided regions of the pixel unit array; determine the corresponding environment of each region of the pixel unit array according to the ambient brightness value measured by each photosensitive pixel in the same region Brightness value.

It should be noted that the foregoing explanations of the embodiment of the shooting exposure control method are also applicable to the shooting exposure control device 100 of this embodiment, and details are not repeated here.

The shooting exposure control device of the embodiment of the present application measures the ambient brightness value by controlling each photosensitive pixel in the pixel unit array, and then determines the ambient brightness value corresponding to each area of the pixel unit array according to the measurement result of the ambient brightness value; wherein, each The area is obtained by dividing the pixel unit array into areas, and each area contains at least one photosensitive pixel. Finally, according to the ambient brightness value measured in each area, the photosensitive pixels in each area are controlled to use the corresponding exposure mode to shoot. In this application, by performing partition exposure processing on the pixel unit array, that is, according to the ambient brightness value measured in each area, control the photosensitive pixels in each area to use an appropriate exposure mode to shoot, which can improve the signal of the darker area in the picture. Noise ratio, to obtain a clearer target image and improve the user's shooting experience.

In order to achieve the above embodiments, the present application also proposes an imaging device, which includes a pixel unit array composed of a plurality of photosensitive pixels, and the imaging device further includes a processor, and the processor is used for:

controlling each photosensitive pixel in the pixel unit array to measure the ambient brightness value;

According to the measurement result of the ambient brightness value, determine the ambient brightness value corresponding to each area of the pixel unit array; wherein, each area is obtained by dividing the pixel unit array, and each area includes at least one photosensitive pixel;

According to the ambient brightness value measured in each area, the photosensitive pixels in each area are controlled to use the corresponding exposure mode to shoot.

It should be noted that the foregoing explanations on the embodiment of the shooting exposure control method are also applicable to the imaging device in this embodiment, and will not be repeated here.

The imaging device of the embodiment of the present application measures the ambient brightness value by controlling each photosensitive pixel in the pixel unit array, and then determines the ambient brightness value corresponding to each area of the pixel unit array according to the measurement result of the ambient brightness value; wherein, each area is The pixel unit array is divided into regions, and each region contains at least one photosensitive pixel. Finally, according to the ambient brightness value measured in each region, the photosensitive pixels in each region are controlled to use the corresponding exposure mode to shoot. In this application, by performing partition exposure processing on the pixel unit array, that is, according to the ambient brightness value measured in each area, control the photosensitive pixels in each area to use an appropriate exposure mode to shoot, which can improve the signal of the darker area in the picture. Noise ratio, to obtain a clearer target image and improve the user's shooting experience.

In order to realize the above-mentioned embodiments, the present application also proposes an electronic device, which is characterized in that it includes: a memory, a processor, and a computer program stored in the memory and operable on the processor. When the processor executes the program, , realizing the shooting exposure control method proposed in the foregoing embodiments of the present application.

In order to realize the above-mentioned embodiments, the present application also proposes a computer-readable storage medium on which a computer program is stored, wherein when the program is executed by a processor, the photographing exposure control method as proposed in the foregoing embodiments of the present application is implemented.

Referring to FIG. 8 , the present application also provides an electronic device 200 . The electronic device 200 includes a memory 50 and a processor 60 . Memory 50 has computer readable instructions stored therein. When the computer-readable instructions are executed by the memory 50 , the processor 60 executes the shooting exposure control method described in any one of the above-mentioned implementation manners.

FIG. 8 is a schematic diagram of the internal structure of an electronic device 200 in one embodiment. The electronic device 200 includes a processor 60 connected through a system bus 81 , a memory 50 (such as a non-volatile storage medium), an internal memory 82 , a display screen 83 and an input device 84 . Wherein, the memory 50 of the electronic device 200 stores an operating system and computer readable instructions. The computer-readable instructions can be executed by the processor 60 to implement the shooting exposure control method of the embodiment of the present application. The processor 60 is used to provide computing and control capabilities to support the operation of the entire electronic device 200 . Internal memory 50 of electronic device 200 provides an environment for execution of computer readable instructions in memory 52 . The display screen 83 of the electronic device 200 may be a liquid crystal display screen or an electronic ink display screen, etc., and the input device 84 may be a touch layer covered on the display screen 83, or may be a button, a trackball or a touch screen provided on the housing of the electronic device 200. It can also be an external keyboard, touchpad or mouse. The electronic device 200 may be a mobile phone, a tablet computer, a notebook computer, a personal digital assistant or a wearable device (such as a smart bracelet, a smart watch, a smart helmet, smart glasses) and the like. Those skilled in the art can understand that the structure shown in FIG. 8 is only a schematic diagram of a partial structure related to the solution of this application, and does not constitute a limitation on the electronic device 200 to which the solution of this application is applied. The specific electronic device 200 may include more or fewer components than shown, or combine certain components, or have a different arrangement of components.

Referring to FIG. 9 , an image processing circuit 90 is included in the electronic device 200 of the embodiment of the present application, and the image processing circuit 90 can be realized by hardware and/or software components, including various types of pipelines defining an ISP (Image Signal Processing, image signal processing) pipeline. processing unit. FIG. 9 is a schematic diagram of an image processing circuit 90 in one embodiment. As shown in FIG. 9 , for ease of description, only various aspects of the image processing technology related to the embodiment of the present application are shown.

As shown in FIG. 9 , the image processing circuit 90 includes an ISP processor 91 (the ISP processor 91 may be the processor 60 ) and a control logic 92 . Image data captured by camera 93 is first processed by ISP processor 91 , which analyzes the image data to capture image statistics that can be used to determine one or more control parameters of camera 93 . The camera 93 may include one or more lenses 932 and an image sensor 934 . The image sensor 934 can include a color filter array (such as a Bayer filter), and the image sensor 934 can obtain light intensity and wavelength information captured by each imaging pixel, and provide a set of raw image data that can be processed by the ISP processor 91 . The sensor 94 (such as a gyroscope) can provide the collected image processing parameters (such as anti-shake parameters) to the ISP processor 91 based on the interface type of the sensor 94 . The interface of the sensor 94 may be a SMIA (StandardMobile Imaging Architecture, Standard Mobile Imaging Architecture) interface, other serial or parallel camera interfaces or a combination of the above interfaces.

In addition, the image sensor 934 may also send raw image data to the sensor 94, the sensor 94 may provide the raw image data to the ISP processor 91 based on the sensor 94 interface type, or the sensor 94 may store the raw image data in the image memory 95.

The ISP processor 91 processes raw image data pixel by pixel in various formats. For example, each image pixel may have a bit depth of 8, 10, 12, or 14 bits, and the ISP processor 91 may perform one or more image processing operations on the raw image data, collecting statistical information about the image data. Among other things, image processing operations can be performed with the same or different bit depth precision.

ISP processor 91 may also receive image data from image memory 95 . For example, the sensor 94 interface sends raw image data to the image memory 95, and the raw image data in the image memory 95 is provided to the ISP processor 91 for processing. The image memory 95 may be the memory 50, a part of the memory 50, a storage device, or an independent dedicated memory in the electronic device, and may include a DMA (Direct Memory Access, Direct Memory Access) feature.

When receiving raw image data from the image sensor 934 interface or from the sensor 94 interface or from the image memory 95, the ISP processor 91 may perform one or more image processing operations, such as temporal filtering. The processed image data may be sent to image memory 95 for additional processing before being displayed. The ISP processor 91 receives processed data from the image memory 95, and performs image data processing in the original domain and in the RGB and YCbCr color spaces on the processed data. The image data processed by the ISP processor 91 may be output to the display 97 (the display 97 may include a display screen 83 ) for viewing by a user and/or further processing by a graphics engine or a GPU (Graphics Processing Unit, graphics processor). In addition, the output of the ISP processor 91 can also be sent to the image memory 95 , and the display 97 can read image data from the image memory 95 . In one embodiment, image memory 95 may be configured to implement one or more frame buffers. In addition, the output of the ISP processor 91 may be sent to an encoder/decoder 96 for encoding/decoding image data. The encoded image data may be saved and decompressed prior to display on the display 97 device. Encoder/decoder 96 may be implemented by a CPU or GPU or a coprocessor.

The statistical data determined by the ISP processor 91 may be sent to the control logic 92 unit. For example, statistics may include image sensor 934 statistics such as auto exposure, auto white balance, auto focus, flicker detection, black level compensation, lens 932 shading correction, etc. Control logic 92 may include a processing element and/or a microcontroller that executes one or more routines (e.g., firmware) that determine control parameters for camera 93 and ISP processor based on received statistical data. 91 control parameters. For example, the control parameters of the camera 93 may include sensor 94 control parameters (such as gain, integration time of exposure control, anti-shake parameters, etc.), camera flash control parameters, lens 932 control parameters (such as focal length for focusing or zooming), or these parameters The combination. ISP control parameters may include gain levels and color correction matrices for automatic white balance and color adjustment (eg, during RGB processing), as well as lens 932 shading correction parameters.

For example, the following are the steps to implement the shooting exposure control method by using the processor 60 in FIG. 8 or using the image processing circuit 90 (specifically, the ISP processor 91) in FIG. 9 :

controlling each photosensitive pixel in the pixel unit array to measure the ambient brightness value;

According to the measurement result of the ambient brightness value, determine the ambient brightness value corresponding to each area of the pixel unit array; wherein, each area is obtained by dividing the pixel unit array, and each area includes at least one photosensitive pixel;

According to the ambient brightness value measured in each area, the photosensitive pixels in each area are controlled to use the corresponding exposure mode to shoot.

For another example, the following are the steps of using the processor in FIG. 8 or using the image processing circuit 90 (specifically, an ISP processor) in FIG. 9 to realize the shooting exposure control method:

Acquiring a gain index value according to the ambient brightness value and a preset target brightness value;

When the gain index value is less than the preset gain index value, use bright light mode to shoot to obtain the target image;

When the gain index value is greater than the preset gain index value, use dark light mode to shoot to obtain the target image.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

Any process or method descriptions in flowcharts or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing custom logical functions or steps of a process , and the scope of preferred embodiments of the present application includes additional implementations in which functions may be performed out of the order shown or discussed, including in substantially simultaneous fashion or in reverse order depending on the functions involved, which shall It should be understood by those skilled in the art to which the embodiments of the present application belong.

The logic and/or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium, For use with instruction execution systems, devices, or devices (such as computer-based systems, systems including processors, or other systems that can fetch instructions from instruction execution systems, devices, or devices and execute instructions), or in conjunction with these instruction execution systems, devices or equipment used. For the purposes of this specification, a "computer-readable medium" may be any device that can contain, store, communicate, propagate or transmit a program for use in or in conjunction with an instruction execution system, device or device. More specific examples (non-exhaustive list) of computer-readable media include the following: electrical connection with one or more wires (electronic device), portable computer disk case (magnetic device), random access memory (RAM), Read Only Memory (ROM), Erasable and Editable Read Only Memory (EPROM or Flash Memory), Fiber Optic Devices, and Portable Compact Disc Read Only Memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program can be printed, since the program can be read, for example, by optically scanning the paper or other medium, followed by editing, interpretation or other suitable processing if necessary. The program is processed electronically and stored in computer memory.

It should be understood that each part of the present application may be realized by hardware, software, firmware or a combination thereof. In the embodiments described above, various steps or methods may be implemented by software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented by any one or a combination of the following techniques known in the art: a discrete Logic circuits, ASICs with suitable combinational logic gates, Programmable Gate Arrays (PGA), Field Programmable Gate Arrays (FPGA), etc.

Those of ordinary skill in the art can understand that all or part of the steps carried by the methods of the above embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. During execution, one or a combination of the steps of the method embodiments is included.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing module, each unit may exist separately physically, or two or more units may be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware or in the form of software function modules. If the integrated modules are realized in the form of software function modules and sold or used as independent products, they can also be stored in a computer-readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, and the like. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limitations on the present application, and those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

Claims (13)

1. A photographic exposure control method for an imaging apparatus including a pixel unit array composed of a plurality of photosensitive pixels, the photographic exposure control method comprising:

controlling each photosensitive pixel in the pixel unit array to measure the environmental brightness value;

determining an environment brightness value corresponding to each area of the pixel unit array according to the measurement result of the environment brightness value; each region is obtained by dividing the pixel unit array into regions, and each region comprises at least one photosensitive pixel;

and controlling the photosensitive pixels in each area to shoot by adopting a corresponding exposure mode according to the environment brightness value measured in each area.

2. The photographic exposure control method according to claim 1, wherein the controlling of the photosensitive pixels in each region to perform photographing in the corresponding exposure mode according to the environmental brightness value measured in each region comprises:

acquiring a gain index value according to the environment brightness value and a preset target brightness value;

when the gain index value is smaller than a preset gain index value, shooting by using a bright light mode to obtain a target image;

and when the gain index value is larger than the preset gain index value, shooting by using a dark light mode to obtain a target image.

3. The photographic exposure control method according to claim 2, wherein the photosensitive pixels include a plurality of long-exposure pixels, a plurality of middle-exposure pixels, and a plurality of short-exposure pixels, and the photographing using the bright light mode to obtain the target image includes:

controlling the pixel unit array to output a plurality of original pixel information respectively under different exposure times; wherein the long exposure time of the long exposure pixels is longer than the middle exposure time of the middle exposure pixels, and the middle exposure time of the middle exposure pixels is longer than the short exposure time of the short exposure pixels;

calculating to obtain merged pixel information according to the original pixel information with the same exposure time in the same photosensitive pixel;

and outputting the target image according to the merged pixel information.

4. The photographic exposure control method according to claim 3, wherein the calculating merged pixel information from the original pixel information of the same exposure time in the same photosensitive pixel includes:

selecting original pixel information of a long exposure pixel, original pixel information of a short exposure pixel or original pixel information of a medium exposure pixel in the same photosensitive pixel;

and calculating to obtain the merged pixel information according to the selected original pixel information and the exposure ratio among the long exposure time, the middle exposure time and the short exposure time.

5. The photographic exposure control method according to claim 2, wherein the photographing using the dark light mode to obtain the target image includes:

controlling the pixel unit array to output a plurality of original pixel information obtained by exposure with the same exposure time;

calculating the original pixel information in the same photosensitive pixel to obtain combined pixel information, wherein each photosensitive pixel corresponds to one combined pixel information;

and outputting the target image according to a plurality of pieces of combined pixel information.

6. The photographic exposure control method according to claim 5, wherein the calculating of the original pixel information in the same photosensitive pixel to obtain combined pixel information includes:

and calculating an average value of the original pixel information in the same photosensitive pixel to obtain the combined pixel information.

7. The photographic exposure control method according to claim 2, after obtaining the gain index value according to the environment brightness value and a preset target brightness value, further comprising:

and when the gain index value is equal to the preset gain index value, shooting by using the bright light mode or the dark light mode to obtain the target image.

8. The photographic exposure control method according to any one of claims 1 to 7, wherein the determining an environmental brightness value corresponding to each region of the pixel unit array based on the measurement result of the environmental brightness value includes:

according to the environment brightness value measured by each photosensitive pixel in the pixel unit array, carrying out region division on the pixel unit array; the environmental brightness values obtained by measuring photosensitive pixels belonging to the same region are similar;

and determining the environment brightness value corresponding to each area of the pixel unit array according to the environment brightness value measured by each photosensitive pixel in the same area.

9. The photographic exposure control method according to any one of claims 1 to 7, wherein the determining an environmental brightness value corresponding to each region of the pixel unit array based on the measurement result of the environmental brightness value includes:

determining each area fixedly divided by the pixel unit array;

and determining the environment brightness value corresponding to each area of the pixel unit array according to the environment brightness value measured by each photosensitive pixel in the same area.

10. A photographic exposure control device for an imaging apparatus including a pixel unit array composed of a plurality of photosensitive pixels, the photographic exposure control device comprising:

the measuring module is used for controlling each photosensitive pixel in the pixel unit array to measure the environmental brightness value;

a determining module, configured to determine, according to the measurement result of the environment brightness value, an environment brightness value corresponding to each region of the pixel unit array; each region is obtained by dividing the pixel unit array into regions, and each region comprises at least one photosensitive pixel;

and the control module is used for controlling the photosensitive pixels in each area to shoot by adopting a corresponding exposure mode according to the environment brightness value measured in each area.

11. An imaging apparatus comprising a pixel cell array of a plurality of photosensitive pixels, the imaging apparatus further comprising a processor configured to:

controlling each photosensitive pixel in the pixel unit array to measure the environmental brightness value;

determining an environment brightness value corresponding to each area of the pixel unit array according to the measurement result of the environment brightness value; each region is obtained by dividing the pixel unit array into regions, and each region comprises at least one photosensitive pixel;

and controlling the photosensitive pixels in each area to shoot by adopting a corresponding exposure mode according to the environment brightness value measured in each area.

12. An electronic device, comprising: a memory, a processor and a computer program stored on the memory and executable on the processor, which when executed by the processor implements the photographic exposure control method according to any one of claims 1 to 9.

13. A computer-readable storage medium on which a computer program is stored, characterized in that the program, when executed by a processor, implements the photographic exposure control method according to any one of claims 1 to 9.