WO2019061042A1 - Exposure compensation method, device and computer readable storage medium - Google Patents

Abstract

The present invention provides an exposure compensation method, a device and a computer readable storage medium. The exposure compensation method comprises, upon receiving of a photographing instruction, acquiring a first brightness value corresponding to a human face region and a second brightness value corresponding to a non-human face region in a photographing region; calculating a first difference value between a target brightness threshold and the first brightness value, and calculating a second difference value between the target brightness threshold and the second brightness value; and according to a preset compensation rule, the first difference value and the second difference value, turning on an image signal processor (ISP) to perform corresponding exposure compensation on the human face region and the non-human face region. The exposure compensation is performed on corresponding regions according to the first difference value and the second difference value. The present invention enables corresponding exposure compensation to be performed separately on the dark-skinned and light-skinned human image or background in the photographing region, and solves the technical problem that the dark-skinned human image and light-skinned human image and light-colored background cannot be normally exposed synchronously.

Description

 Exposure compensation method, device and computer readable storage medium

Technical field

The present invention relates to the field of intelligent terminals, and in particular, to a method and apparatus for exposure compensation and a computer readable storage medium.

Background technique

At present, the camera device carried by the intelligent terminal on the market adopts the automatic exposure mode (AE), which is an exposure mode that automatically determines the exposure combination (aperture/shutter) according to the brightness of the subject and the focal length of the lens. However, the AE exposure technology has only one exposure value. When there is a target with a large difference between light and dark in the shooting scene, such as when shooting a portrait with dark skin and light skin, it is easy to produce a light-skinned portrait and the background exposure is normal, the dark-skinned portrait is dark. A piece of background; or a dark-skinned portrait is prone to overexposure when the dark-skinned portrait is exposed. Therefore, the traditional exposure compensation method is difficult to meet the user's photographing needs, resulting in poor user experience.

Summary of the invention

The main object of the present invention is to provide a method, terminal and computer readable storage medium for exposure compensation, which aims to solve the technical problem that the traditional photographing method can not simultaneously expose the dark-skinned portrait and the light-skinned portrait and the light-colored background.

To achieve the above object, the present invention provides a method of exposure compensation, the method of exposure compensation comprising the following steps:

Obtaining, by the photographing instruction, a first brightness value corresponding to the face area in the shooting area and a second brightness value corresponding to the non-face area;

Calculating a first difference between the target brightness threshold and the first brightness value, and calculating a second difference between the target brightness threshold and the second brightness value;

And according to the preset compensation rule, the first difference value, and the second difference value, the image signal processor ISP is activated to perform corresponding exposure compensation on the face area and the non-face area.

Optionally, the step of initiating corresponding exposure compensation by the image signal processor ISP to the face region and the non-face region according to the preset compensation rule, the first difference value, and the second difference value include:

Activating the image signal processor ISP to segment the AE compensation configuration according to the face region and the non-face region;

Performing exposure compensation on the face region by the image signal processor ISP according to the split AE compensation configuration and the first difference value;

And performing the exposure compensation on the non-face area by the image signal processor ISP according to the split AE compensation configuration and the second difference.

Optionally, after the step of acquiring the first brightness value corresponding to the face area and the second brightness value corresponding to the non-face area in the shooting area, the method further includes:

Obtaining a first coordinate value of the face region and a second coordinate value of the non-face region, and storing the first coordinate value and the second coordinate value correspondingly.

Optionally, the step of initiating corresponding exposure compensation by the image signal processor ISP to the face region and the non-face region according to the preset compensation rule, the first difference value, and the second difference value include:

And starting the image signal processor ISP to perform exposure compensation on the first coordinate value corresponding to the face region according to the preset compensation rule and the first difference value;

And starting the image signal processor ISP to perform exposure compensation on the second coordinate value corresponding to the non-face area according to the preset compensation rule and the second difference.

Optionally, after the step of acquiring the first brightness value corresponding to the face area and the second brightness value corresponding to the non-face area in the shooting area, the method further includes:

Calculating a difference between the first brightness value and the second brightness value, and determining whether the difference is greater than a preset difference threshold;

And when the difference is greater than the preset difference threshold, calculating a first difference between the target brightness threshold and the first brightness value, and calculating a second difference between the target brightness threshold and the second brightness value.

Optionally, after the step of calculating the difference between the first brightness value and the second brightness value, and determining whether the difference is greater than a preset difference threshold, the method further includes:

When the difference is less than the preset difference threshold, the photographing is completed according to the preset default photographing rule.

Optionally, before the step of acquiring the first brightness value corresponding to the face area in the shooting area and the second brightness value corresponding to the non-face area, the method further includes:

According to the pre-stored face data, an area matching the photographing area and the pre-stored face data is marked as a face area, and an area that does not match the pre-stored face data is marked as a non-face area.

Optionally, after the step of calculating a first difference between the target brightness threshold and the first brightness value, and calculating a second difference between the target brightness threshold and the second brightness value, the method further includes:

Determining whether a difference between the first difference value and the second difference value is within a preset range value;

If the first difference value and the second difference value are within a preset range value, the photographing is completed according to a preset default photographing rule.

Furthermore, in order to achieve the above object, the present invention also provides a computer readable storage medium having stored thereon an exposure compensation program, the exposure compensation program being executed by a processor to implement the above-described The steps of the method of exposure compensation.

The present invention provides a method and apparatus for exposure compensation, and a computer readable storage medium. The method of exposure compensation acquires a first brightness value and a non-face corresponding to a face area in a shooting area when a photographing instruction is received. a second brightness value corresponding to the area; calculating a first difference between the target brightness threshold and the first brightness value, and calculating a second difference between the target brightness threshold and the second brightness value;

And according to the preset compensation rule, the first difference value, and the second difference value, the image signal processor ISP is activated to perform corresponding exposure compensation on the face area and the non-face area. In the above manner, before the photographing, the present invention first divides the photographing area into a face area and a non-face area, and calculates a first difference value of the face area to be compensated, and a to-be-compensated value of the non-face area. Two differences. Then, the ISP is activated to perform exposure compensation on the face area and the non-face area according to the corresponding first difference value and second difference value. In this way, the dark skin color, light-skinned portrait or background in the shooting area can be separately obtained corresponding to the exposure compensation, thereby solving the technical problem that the traditional photographing method can not simultaneously expose the dark-skinned portrait and the light-skinned portrait and the light-colored background. .

DRAWINGS

1 is a schematic structural diagram of a terminal in a hardware operating environment of an apparatus for exposure compensation according to an embodiment of the present invention;

2 is a schematic flow chart of a first embodiment of a method for exposure compensation according to the present invention;

3 is a schematic flow chart of a second embodiment of a method for exposure compensation according to the present invention;

4 is a schematic flow chart of a third embodiment of a method for exposure compensation according to the present invention.

The implementation, functional features, and advantages of the present invention will be further described in conjunction with the embodiments.

Detailed ways

It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The main idea of the solution of the embodiment of the present invention is: acquiring a first brightness value corresponding to a face area in a shooting area and a second brightness value corresponding to a non-face area when receiving a photographing instruction; calculating a target brightness threshold and the a first difference of the first brightness value, and calculating a second difference between the target brightness threshold and the second brightness value; according to the preset compensation rule, the first difference, and the second difference, The startup image signal processor ISP performs corresponding exposure compensation on the face region and the non-face region, and solves the technical problem that the traditional photographing method dark-skinned portraits and light-skinned portraits, and the light-colored background cannot be normally exposed at the same time.

1 is a schematic structural diagram of a terminal in a hardware operating environment of an apparatus for exposure compensation according to an embodiment of the present invention.

The terminal in the embodiment of the present invention may be a PC, or may be a smart phone, a tablet computer, an e-book reader, and an MP4 (Moving). Picture Experts Group Audio Layer IV, dynamic imaging experts compress standard audio layers 3) portable terminals such as players and portable computers with display functions. As illustrated in FIG. 1, the terminal can include a processor 1001 (eg, a CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is configured to implement connection communication between the components; the optional user interface 1003 may include a display, an input unit such as a keyboard, and the network interface 1004 may optionally include a standard wired interface. Wireless interface (such as WI-FI interface); memory 1005 can be high-speed RAM memory or stable memory (non-volatile Alternatively, the memory 1005 may alternatively be a storage device independent of the processor 1001 described above.

It will be understood by those skilled in the art that the terminal structure of the hardware operating environment of the exposure compensation device shown in FIG. 1 does not constitute a limitation of the device for exposure compensation of the present invention, and may include more or less components than those illustrated, or a combination thereof. Some components, or different component arrangements.

With continued reference to FIG. 1, the memory 1005 as a computer storage medium of FIG. 1 may include an operating system, a network communication module, a user interface module, and a program for exposure compensation.

In the terminal shown in FIG. 1, the network interface 1004 is mainly used to connect to the cloud server for data communication with the cloud server; the user interface 1003 can be connected to the client (user end) for data communication with the client; and the processor 1001 can A program for calling exposure compensation stored in the memory 1005 and performing the following operations:

Obtaining, by the photographing instruction, a first brightness value corresponding to the face area in the shooting area and a second brightness value corresponding to the non-face area;

Calculating a first difference between the target brightness threshold and the first brightness value, and calculating a second difference between the target brightness threshold and the second brightness value;

And according to the preset compensation rule, the first difference value, and the second difference value, the image signal processor ISP is activated to perform corresponding exposure compensation on the face area and the non-face area.

Further, the processor 1001 may also call the program of exposure compensation stored in the memory 1005 to perform the following operations:

Activating the image signal processor ISP to segment the AE compensation configuration according to the face region and the non-face region;

Performing exposure compensation on the face region by the image signal processor ISP according to the split AE compensation configuration and the first difference value;

And performing the exposure compensation on the non-face area by the image signal processor ISP according to the split AE compensation configuration and the second difference.

Further, the processor 1001 may also call the program of exposure compensation stored in the memory 1005 to perform the following operations:

Obtaining a first coordinate value of the face region and a second coordinate value of the non-face region, and storing the first coordinate value and the second coordinate value correspondingly.

Further, the processor 1001 may also call the program of exposure compensation stored in the memory 1005 to perform the following operations:

And starting the image signal processor ISP to perform exposure compensation on the first coordinate value corresponding to the face region according to the preset compensation rule and the first difference value;

And starting the image signal processor ISP to perform exposure compensation on the second coordinate value corresponding to the non-face area according to the preset compensation rule and the second difference.

Further, the processor 1001 may also call the program of exposure compensation stored in the memory 1005 to perform the following operations:

Calculating a difference between the first brightness value and the second brightness value, and determining whether the difference is greater than a preset difference threshold;

And when the difference is greater than the preset difference threshold, calculating a first difference between the target brightness threshold and the first brightness value, and calculating a second difference between the target brightness threshold and the second brightness value.

Further, the processor 1001 may also call the program of exposure compensation stored in the memory 1005 to perform the following operations:

When the difference is less than the preset difference threshold, the photographing is completed according to the preset default photographing rule.

Further, the processor 1001 may also call the program of exposure compensation stored in the memory 1005 to perform the following operations:

According to the pre-stored face data, an area matching the photographing area and the pre-stored face data is marked as a face area, and an area that does not match the pre-stored face data is marked as a non-face area.

Further, the processor 1001 may also call the program of exposure compensation stored in the memory 1005 to perform the following operations:

Determining whether a difference between the first difference value and the second difference value is within a preset range value;

If the first difference value and the second difference value are within a preset range value, the photographing is completed according to a preset default photographing rule.

Based on the above hardware structure, an embodiment of the method for exposure compensation of the present invention is proposed.

Referring to FIG. 2, FIG. 2 is a schematic flow chart of a first embodiment of a method for exposure compensation according to the present invention.

In this embodiment, the method for exposure compensation includes the following steps:

Step S10, when receiving the photographing instruction, acquiring a first brightness value corresponding to the face area in the shooting area and a second brightness value corresponding to the non-face area;

In this embodiment, in order to solve the technical problem that the traditional photographing method, the dark-skinned portrait and the light-skinned portrait, and the light-colored background cannot be simultaneously exposed normally, the face region and the non-face region are divided, and the face region and the non-face region are calculated. Corresponding to the compensated value, the ISP is then activated to perform corresponding exposure compensation on the face area and the non-face area. The method for providing exposure compensation of the present invention can be applied to an intelligent terminal, which can be a digital camera, a tablet computer or a smart phone. For the convenience of description, the smart phone is taken as an example in this embodiment. Specifically, the photographing instruction may be a user operation trigger. If the user needs to take a photo, he can start the photo program through the shortcut icon in the main interface of the smartphone or the shortcut button. The photographing program may be a photographing program carried by the smart terminal itself, or may be an application program developed based on an operating system of the smart terminal. After the smartphone enters the photographing program, the selected shooting area is acquired, and the face area and the non-face area in the shooting area are divided. Then, the brightness value first brightness value and the second brightness value corresponding to the face area and the non-face area are obtained. And storing the brightness value. In a specific embodiment, when there are two faces, the brightness value corresponding to the first face region corresponding to the two faces and the brightness value corresponding to the second face are further acquired. Then, as in the above steps, the corresponding calculation of the brightness output value is performed separately, and then the corresponding exposure compensation is performed.

Step S20, calculating a first difference between the target brightness threshold and the first brightness value, and calculating a second difference between the target brightness threshold and the second brightness value;

Specifically, when acquiring the first brightness value of the face area and the second brightness value data of the non-face area, the smart phone acquires a pre-stored target brightness threshold, where the target brightness threshold is the optimal brightness of the picture, and the calculation is performed. And a first difference ΔY1 between the target brightness threshold and the first brightness value, and a second difference ΔY2 between the target brightness threshold and the second brightness value. The first difference value and the second difference value are respectively the brightness difference values to be compensated corresponding to the face area and the non-face area.

Step S30, starting the image signal processor ISP to perform corresponding exposure compensation on the face area and the non-face area according to the preset compensation rule, the first difference value, and the second difference value.

Specifically, the terminal automatically starts The ISP processes the image data, and divides the AE compensation configuration of the smart terminal according to the brightness distribution of each area, and configures the face area and the non-face area according to the first difference and the second difference. Corresponding AE compensation intensity.

Further, the first coordinate value of the face region and the second coordinate value of the non-face region are acquired, and the first coordinate value and the second coordinate value are correspondingly stored.

Specifically, the brightness values of the face area and the non-face area are acquired, and the coordinates of each brightness area are obtained; after the smart terminal enters the photographing program, the system automatically acquires the face area and the non-person in the shooting scene selected by the user. The brightness value/coordinate value of the face region, and correspondingly obtaining the coordinate value/luminance value corresponding to the brightness value, and feeding back the obtained brightness value and the corresponding coordinate value to the terminal. For example, the system may first detect the face and obtain the corresponding position information, that is, the coordinate value, and feed back the coordinate value of the face position to the smart terminal, and the system acquires the brightness value Y of each face region in the scene according to the position data, and The value Y and its corresponding coordinate value are fed back to the smart terminal.

The embodiment provides a method and device for exposure compensation, and a computer readable storage medium. The method for obtaining exposure compensation acquires a first brightness value corresponding to a face region in a shooting area and a non-human when receiving a photographing instruction. a second brightness value corresponding to the face region; calculating a first difference between the target brightness threshold and the first brightness value, and calculating a second difference between the target brightness threshold and the second brightness value; The rule, the first difference value and the second difference value, the activation image signal processor ISP performs corresponding exposure compensation on the face area and the non-face area. In the above manner, before the photographing, the present invention first divides the photographing area into a face area and a non-face area, and calculates a first difference value of the face area to be compensated, and a to-be-compensated value of the non-face area. Two differences. Then, the ISP is activated to perform exposure compensation on the face area and the non-face area according to the corresponding first difference value and second difference value. In this way, the dark skin color, light-skinned portrait or background in the shooting area can be separately obtained corresponding to the exposure compensation, thereby solving the technical problem that the traditional photographing method can not simultaneously expose the dark-skinned portrait and the light-skinned portrait and the light-colored background. .

Referring to FIG. 3, FIG. 3 is a schematic flow chart of a second embodiment of a method for exposure compensation according to the present invention.

In this embodiment, based on the embodiment shown in FIG. 2, further, in this embodiment, step S30 includes:

Step S31, starting the image signal processor ISP, and dividing the AE compensation configuration according to the face area and the non-face area;

Specifically, the exposure compensation device activates the image signal processor ISP, and according to the pre-stored face data, the area where the shooting area matches the pre-stored face data is marked as a face area, and The area where the pre-stored face data does not match is marked as a non-face area. The AE compensation configuration is then segmented according to the face area and the non-face area. Corresponding exposure compensation of the face area and the non-face area is implemented.

Step S32, performing exposure compensation on the face region by the image signal processor ISP according to the segmentation AE compensation configuration and the first difference value;

Specifically, the image signal processor ISP is activated, and then the first difference corresponding to the face region is compensated according to the segmentation AE compensation configuration and a first difference between the face region and the target brightness threshold. The exposure is such that the face area achieves the best picture brightness.

Step S33, according to the split AE compensation configuration and the second difference, the non-face area is subjected to exposure compensation by the image signal processor ISP.

Specifically, the image signal processor ISP is activated, and then according to the segmentation AE compensation configuration and the second difference between the non-face region, that is, the background region and the target brightness threshold, the non-face region is The background area compensates for the exposure corresponding to the second difference, so that the non-face area, that is, the background area, achieves the best photographing brightness. For example, according to the preset compensation rule and the first difference, the activation image signal processor ISP performs exposure compensation on the first coordinate value corresponding to the face region; according to the preset compensation rule and the second difference, The startup image signal processor ISP performs exposure compensation on the second coordinate value corresponding to the non-face area.

The embodiment provides a method and device for exposure compensation, and a computer readable storage medium. The method for obtaining exposure compensation acquires a first brightness value corresponding to a face region in a shooting area and a non-human when receiving a photographing instruction. a second brightness value corresponding to the face region; calculating a first difference between the target brightness threshold and the first brightness value, and calculating a second difference between the target brightness threshold and the second brightness value; The rule, the first difference value and the second difference value, the activation image signal processor ISP performs corresponding exposure compensation on the face area and the non-face area. In the above manner, before the photographing, the present invention first divides the photographing area into a face area and a non-face area, and calculates a first difference value of the face area to be compensated, and a to-be-compensated value of the non-face area. Two differences. Then, the ISP is activated to perform exposure compensation on the face area and the non-face area according to the corresponding first difference value and second difference value. In this way, the dark skin color, light-skinned portrait or background in the shooting area can be separately obtained corresponding to the exposure compensation, thereby solving the technical problem that the traditional photographing method can not simultaneously expose the dark-skinned portrait and the light-skinned portrait and the light-colored background. .

Referring to FIG. 4, FIG. 4 is a schematic flow chart of a third embodiment of a method for exposure compensation according to the present invention.

In this embodiment, based on the embodiment shown in FIG. 2, the method for exposure compensation further includes:

Step S40, calculating a difference between the first brightness value and the second brightness value, and determining whether the difference is greater than a preset difference threshold;

Specifically, the smartphone automatically compares the luminance difference values ΔY1 and ΔY2 calculated by the system with the target brightness threshold. The smart phone described in this embodiment is provided with a data processing module, which can be used to compare the calculated different brightness difference values ΔY1 and ΔY2 with the target brightness threshold. The target brightness threshold used in the present embodiment is a brightness threshold set in advance in the smartphone based on the brightness recognition ability of the human eye.

In step S50, when the difference is less than the preset difference threshold, the photographing is completed according to the preset default photographing rule.

Specifically, if the difference is less than or equal to the threshold, the default photographing mode is continued to be used.

Step S60, calculating a first difference between the target brightness threshold and the first brightness value when the difference is greater than the preset difference threshold, and calculating the target brightness threshold and the second brightness value. Difference.

Specifically, according to the comparison result in the above steps, if the difference is greater than the threshold, the smartphone automatically starts. The ISP processes the image data, and divides the AE compensation configuration of the smart phone according to the brightness distribution of the face area and the non-face area, and configures the corresponding AE compensation intensity according to the corresponding coordinates of each brightness area.

Further, the method for exposure compensation further includes:

Step S70, determining whether the difference between the first difference value and the second difference value is within a preset range value;

Specifically, the difference between the brightness value of the face area and the target brightness threshold may be further determined, and the difference between the brightness value of the non-face area and the target brightness threshold is second. The difference between the differences is determined by determining whether the difference reaches a difference threshold that requires corresponding exposure compensation.

Step S80: If the first difference value and the second difference value are within a preset range value, the photographing is completed according to a preset default photographing rule.

Specifically, when the difference reaches the difference threshold that needs to perform corresponding exposure compensation, the process returns to the above step S30, otherwise, the default photographing mode is continued.

The embodiment provides a method and device for exposure compensation, and a computer readable storage medium. The method for obtaining exposure compensation acquires a first brightness value corresponding to a face region in a shooting area and a non-human when receiving a photographing instruction. a second brightness value corresponding to the face region; calculating a first difference between the target brightness threshold and the first brightness value, and calculating a second difference between the target brightness threshold and the second brightness value; The rule, the first difference value and the second difference value, the activation image signal processor ISP performs corresponding exposure compensation on the face area and the non-face area. In the above manner, before the photographing, the present invention first divides the photographing area into a face area and a non-face area, and calculates a first difference value of the face area to be compensated, and a to-be-compensated value of the non-face area. Two differences. Then, the ISP is activated to perform exposure compensation on the face area and the non-face area according to the corresponding first difference value and second difference value. In this way, the dark skin color, light-skinned portrait or background in the shooting area can be separately obtained corresponding to the exposure compensation, thereby solving the technical problem that the traditional photographing method can not simultaneously expose the dark-skinned portrait and the light-skinned portrait and the light-colored background. .

The invention also provides a computer readable storage medium.

A program for exposure compensation is stored on the computer readable storage medium of the present invention, and the program of the exposure compensation is implemented by the processor to implement the steps of the intelligent method as described above.

For the method implemented when the program of the exposure compensation is executed, reference may be made to various embodiments of the method for exposure compensation according to the present invention, and details are not described herein again.

It is to be understood that the term "comprises", "comprising", or any other variants thereof, is intended to encompass a non-exclusive inclusion, such that a process, method, article, or It also includes other elements that are not explicitly listed, or elements that are inherent to such a process, method, item, or system. An element defined by the phrase "comprising a ..." does not exclude the presence of additional equivalent elements in a process, method, article, or system that includes the element, without further limitation.

The serial numbers of the embodiments of the present invention are merely for the description, and do not represent the advantages and disadvantages of the embodiments.

Through the description of the above embodiments, those skilled in the art can clearly understand that the foregoing embodiment method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is better. Implementation. Based on such understanding, portions of the technical solution of the present invention that contribute substantially or to the prior art may be embodied in the form of a software product stored in a storage medium (such as a ROM/RAM as described above). , a disk, an optical disk, including a number of instructions for causing a terminal device (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the methods described in various embodiments of the present invention.

The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the present invention and the drawings are directly or indirectly applied to other related technical fields. The same is included in the scope of patent protection of the present invention.

Claims (10)

 A method of exposure compensation, characterized in that the method of exposure compensation comprises the following steps: Obtaining, by the photographing instruction, a first brightness value corresponding to the face area in the shooting area and a second brightness value corresponding to the non-face area; Calculating a first difference between the target brightness threshold and the first brightness value, and calculating a second difference between the target brightness threshold and the second brightness value; And according to the preset compensation rule, the first difference value, and the second difference value, the image signal processor ISP is activated to perform corresponding exposure compensation on the face area and the non-face area. The exposure compensation method according to claim 1, wherein the image signal processor ISP activates the face region according to the preset compensation rule, the first difference value, and the second difference value The steps of exposure compensation corresponding to the non-face area include: Activating the image signal processor ISP to segment the AE compensation configuration according to the face region and the non-face region; Performing exposure compensation on the face region by the image signal processor ISP according to the split AE compensation configuration and the first difference value; And performing the exposure compensation on the non-face area by the image signal processor ISP according to the split AE compensation configuration and the second difference. The exposure compensation method according to claim 1, wherein the first brightness value corresponding to the face area in the shooting area and the second brightness value corresponding to the non-face area are acquired when the photographing instruction is received. After the steps, it also includes: Obtaining a first coordinate value of the face region and a second coordinate value of the non-face region, and storing the first coordinate value and the second coordinate value correspondingly. The exposure compensation method according to claim 3, wherein the image signal processor ISP activates the face region according to the preset compensation rule, the first difference value, and the second difference value The steps of exposure compensation corresponding to the non-face area include: And starting the image signal processor ISP to perform exposure compensation on the first coordinate value corresponding to the face region according to the preset compensation rule and the first difference value; And starting the image signal processor ISP to perform exposure compensation on the second coordinate value corresponding to the non-face area according to the preset compensation rule and the second difference. The exposure compensation method according to claim 1, wherein the first brightness value corresponding to the face area in the shooting area and the second brightness value corresponding to the non-face area are acquired when the photographing instruction is received. After the steps, it also includes: Calculating a difference between the first brightness value and the second brightness value, and determining whether the difference is greater than a preset difference threshold; And when the difference is greater than the preset difference threshold, calculating a first difference between the target brightness threshold and the first brightness value, and calculating a second difference between the target brightness threshold and the second brightness value. The method of exposure compensation according to claim 5, wherein the calculating the difference between the first brightness value and the second brightness value and determining whether the difference is greater than a preset difference threshold After the step, it also includes: When the difference is less than the preset difference threshold, the photographing is completed according to the preset default photographing rule. The exposure compensation method according to claim 1, wherein the first brightness value corresponding to the face area in the shooting area and the second brightness value corresponding to the non-face area are acquired when the photographing instruction is received. Before the steps, it also includes: According to the pre-stored face data, an area matching the photographing area and the pre-stored face data is marked as a face area, and an area that does not match the pre-stored face data is marked as a non-face area. The method of exposure compensation according to claim 1, wherein said calculating a first difference between said target brightness threshold and said first brightness value, and calculating said target brightness threshold and said second brightness value After the step of the second difference, the method further includes: Determining whether a difference between the first difference value and the second difference value is within a preset range value; If the first difference value and the second difference value are within a preset range value, the photographing is completed according to a preset default photographing rule. An apparatus for exposure compensation, characterized in that the apparatus for exposure compensation comprises a processor, a memory, and a program of exposure compensation stored on the memory and operable on the processor, wherein the exposure compensation The steps of the method of exposure compensation according to any one of claims 1 to 8 when the program is executed by the processor. A computer readable storage medium, wherein the computer readable storage medium stores a program for exposure compensation, the program of the exposure compensation being executed by a processor to implement any one of claims 1 to 8 The steps of the method of exposure compensation.