CN115691418A - Luminance compensation method, luminance compensation device, and storage medium - Google Patents

Abstract

The disclosure relates to a brightness compensation method, a brightness compensation device and a storage medium. The brightness compensation method is applied to the terminal, and comprises the following steps: and determining a first display brightness and a second display brightness in response to determining to perform brightness compensation on the display area of the under-screen camera of the terminal. The first display brightness is the reference display brightness of the display area of the camera under the screen, and the second display brightness is the real-time display brightness of the display area of the camera under the screen. And performing brightness compensation on the display area of the camera under the screen based on the first display brightness and the second display brightness. According to the brightness compensation method provided by the disclosure, the brightness compensation can be performed on the display brightness of the camera display area under the screen based on the difference between the real-time display brightness and the reference display brightness of the camera display area, so that the compensation mode of the screen brightness is simpler and more convenient, and has pertinence.

Description

Brightness compensation method, brightness compensation device and storage medium

technical field

The present disclosure relates to the technical field of display driving, and in particular, to a brightness compensation method, a brightness compensation device, and a storage medium.

Background technique

At present, many mobile phones use active-matrix organic light-emitting diode (AMOLED) screens and front-facing cameras under the screen. At the position of the camera under the screen, in order to increase the amount of light entering the camera, the transmittance of this part needs to be increased.

In related technologies, the design of the display area of the camera under the screen is different from that of the display area of the non-screen camera, for example: changing the number of pixels (pixels) per inch on the diagonal where the camera under the screen is located (PixelsPerInch, PPI), or Changing the material of the display results in a different decay curve for the two display areas. Therefore, in the initial stage of use, the display area of the under-screen camera and the display area of the non-screen camera can be kept consistent. However, after using it for a period of time, because the position of the camera under the screen is not synchronized with the brightness attenuation of other positions on the screen, the display brightness of the display area of the camera under the screen is different from that of the display area of the non-screen camera.

Contents of the invention

In order to overcome the problems existing in related technologies, the present disclosure provides a brightness compensation method, a brightness compensation device and a storage medium.

According to the first aspect of an embodiment of the present disclosure, a brightness compensation method is provided, which is applied to a terminal, and the brightness compensation method includes: determining the first display brightness and the second Two display brightness. The first display brightness is the reference display brightness of the display area of the camera under the screen, and the second display brightness is the real-time display brightness of the display area of the camera under the screen. Based on the first display brightness and the second display brightness, brightness compensation is performed on the display area of the camera under the screen.

In an embodiment, the determining the first display brightness and the second display brightness includes: displaying a plurality of test grayscale images in a time-sharing manner in the display area of the under-screen camera, and the test grayscale images correspond to attribute parameters , the attribute parameters include backlight display brightness of the terminal when the test grayscale image is captured, a screen display grayscale value, and a reference grayscale value. For each test gray-scale image in the plurality of test gray-scale images, respectively based on the attribute parameters of the test gray-scale image, determine the reference display brightness and real-time display brightness, and obtain a plurality of display brightness pairs, each display brightness pair It includes the benchmark display brightness and real-time display brightness determined based on the attribute parameters of the same test grayscale image. Taking the reference display brightness centered in the display brightness pair with the largest brightness difference ratio among the plurality of display brightness pairs as the first display brightness, and using the real-time display brightness centered in the display brightness pair with the largest brightness difference ratio among the plurality of display brightness pairs Display brightness, as the second display brightness. The brightness difference ratio is a ratio of the difference between the reference display brightness and the real-time display brightness to the reference display brightness.

In another embodiment, the determining the reference display brightness based on the attribute parameters of the test grayscale image includes: based on the reference grayscale value in the attribute information of the test grayscale image, the screen display grayscale value, and The brightness conversion curve obtains the display brightness corresponding to the reference gray scale value, and determines the display brightness corresponding to the reference gray scale value as the reference display brightness.

In yet another embodiment, the determining the second display brightness includes: controlling the under-screen camera to control the display brightness of the under-screen camera based on the backlight display brightness in the test gray-scale image attribute information and the screen display gray-scale value. A picture is displayed in the display area for shooting, and a shot image is obtained. Based on the photographed grayscale value corresponding to the photographed image, the screen display grayscale value, and the light conversion curve, the display brightness corresponding to the photographed grayscale value is obtained, and the display brightness corresponding to the photographed grayscale value is, Determined as the second display brightness.

In yet another embodiment, the performing brightness compensation on the display area of the under-display camera based on the first display brightness and the second display brightness includes: if the first display brightness is the same as the second display brightness If the brightness difference ratio between display brightnesses is less than or equal to the first threshold, then the display brightness of the display area of the camera under the screen remains unchanged. If the brightness difference ratio between the first display brightness and the second display brightness is greater than the first threshold, based on the brightness difference ratio between the first display brightness and the second display brightness, and The display brightness of the non-screen camera display area of the terminal is compensated for the display brightness of the under-screen camera display area.

In yet another embodiment, based on the brightness difference ratio between the first display brightness and the second display brightness, and the display brightness of the non-screen camera display area of the terminal, the camera under the screen Compensating the display brightness of the display area includes: determining a first compensation ratio of the backlight display brightness of the camera display area under the terminal screen based on the brightness difference ratio between the first display brightness and the second display brightness, Or determine the second compensation ratio of the backlight display brightness of the non-screen camera display area of the terminal;

If the first compensation ratio of the backlight display brightness of the display area of the camera under the screen of the terminal is determined, based on the first compensation ratio and the display brightness of the display area of the non-screen camera of the terminal, by compensating the display brightness of the camera under the screen The backlight display brightness of the area is compensated for the display brightness of the camera display area under the screen;

If the second compensation ratio of the backlight display brightness of the non-screen camera display area of the terminal is determined, based on the second compensation ratio and the display brightness of the non-screen camera display area of the terminal, by compensating the non-screen camera The backlight display brightness of the display area is used to compensate the display brightness of the display area of the camera under the screen.

According to the second aspect of the embodiments of the present disclosure, there is provided a brightness compensation device, which is applied to a terminal, and the brightness compensation device includes: a determination unit, configured to determine the brightness compensation for the display area of the terminal's off-screen camera in response to determining the brightness compensation of the first A display brightness and a second display brightness. The first display brightness is the reference display brightness of the display area of the camera under the screen, and the second display brightness is the real-time display brightness of the display area of the camera under the screen. The compensation unit is configured to perform brightness compensation on the display area of the under-display camera based on the first display brightness and the second display brightness.

In an embodiment, the determination unit determines the first display brightness and the second display brightness in the following manner: in the display area of the camera under the screen, a plurality of test grayscale images are displayed in time division, and the test grayscale images Corresponding to an attribute parameter, the attribute parameter includes the backlight display brightness of the terminal when the test grayscale image is taken, the grayscale value displayed on the screen, and the reference grayscale value. For each test gray-scale image in the plurality of test gray-scale images, respectively based on the attribute parameters of the test gray-scale image, determine the reference display brightness and real-time display brightness, and obtain a plurality of display brightness pairs, each display brightness pair It includes the benchmark display brightness and real-time display brightness determined based on the attribute parameters of the same test grayscale image. Taking the reference display brightness centered in the display brightness pair with the largest brightness difference ratio among the plurality of display brightness pairs as the first display brightness, and using the real-time display brightness centered in the display brightness pair with the largest brightness difference ratio among the plurality of display brightness pairs Display brightness, as the second display brightness. The brightness difference ratio is a ratio of the difference between the reference display brightness and the real-time display brightness to the reference display brightness.

In another embodiment, the determination unit determines the reference display brightness based on the attribute parameters of the test grayscale image in the following manner: based on the reference grayscale value in the attribute information of the test grayscale image, the screen display grayscale Step value, and light conversion curve, obtain the display brightness corresponding to the reference gray scale value, and determine the display brightness corresponding to the reference gray scale value as the reference display brightness.

In yet another embodiment, the determination unit determines the second display brightness in the following manner: based on the backlight display brightness in the test grayscale image attribute information and the screen display grayscale value, control the camera under the screen to The screen displayed in the display area of the camera under the screen is photographed to obtain the photographed image. Based on the photographed grayscale value corresponding to the photographed image, the screen display grayscale value, and the light conversion curve, the display brightness corresponding to the photographed grayscale value is obtained, and the display brightness corresponding to the photographed grayscale value is, Determined as the second display brightness.

In yet another embodiment, the compensation unit performs brightness compensation on the display area of the under-display camera based on the first display brightness and the second display brightness in the following manner: if the first display brightness and the second display brightness If the brightness difference ratio between the second display brightness is less than or equal to the first threshold, then the display brightness of the display area of the camera under the screen remains unchanged. If the brightness difference ratio between the first display brightness and the second display brightness is greater than the first threshold, based on the brightness difference ratio between the first display brightness and the second display brightness, and The display brightness of the non-screen camera display area of the terminal is compensated for the display brightness of the under-screen camera display area.

In yet another embodiment, the compensation unit adopts the following method based on the brightness difference ratio between the first display brightness and the second display brightness, and the display brightness of the non-screen camera display area of the terminal, Compensating the display brightness of the display area of the camera under the screen: based on the brightness difference ratio between the first display brightness and the second display brightness, determine the second value of the backlight display brightness of the display area of the camera under the screen of the terminal A compensation ratio, or a second compensation ratio for determining the backlight display brightness of the non-screen camera display area of the terminal. If the first compensation ratio of the backlight display brightness of the display area of the camera under the screen of the terminal is determined, based on the first compensation ratio and the display brightness of the display area of the non-screen camera of the terminal, by compensating the display brightness of the camera under the screen The display brightness of the backlight of the area is compensated for the display brightness of the display area of the camera under the screen. If the second compensation ratio of the backlight display brightness of the non-screen camera display area of the terminal is determined, based on the second compensation ratio and the display brightness of the non-screen camera display area of the terminal, by compensating the non-screen camera The backlight display brightness of the display area is used to compensate the display brightness of the display area of the camera under the screen.

According to a third aspect of an embodiment of the present disclosure, there is provided a brightness compensation device, including: a memory for storing instructions; and a processor for invoking the instructions stored in the memory to execute any one of the brightness compensation methods described above.

According to a fourth aspect of the embodiments of the present disclosure, there is provided a computer-readable storage medium, in which instructions are stored, and when the instructions are executed by a processor, any brightness compensation method described above is executed.

The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects: through the brightness compensation method provided by the present disclosure, it is possible to adjust the display of the camera display area under the screen based on the difference between the real-time display brightness of the camera display area and the reference display brightness. The brightness is compensated for the brightness, which makes the compensation method of the screen brightness simpler, more convenient, and more targeted.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description serve to explain the principles of the disclosure.

Fig. 1 is a schematic diagram showing a display area of a terminal according to an exemplary embodiment.

Fig. 2 is a flowchart of a brightness compensation method according to an exemplary embodiment.

Fig. 3 is a flow chart showing a brightness determination method according to an exemplary embodiment.

Fig. 4 is a flow chart showing another brightness determination method according to an exemplary embodiment.

Fig. 5 is an effect diagram showing display brightness of a display screen according to an exemplary embodiment.

Fig. 6 is a flowchart of another brightness compensation method according to an exemplary embodiment.

Fig. 7 is a block diagram of a brightness compensation device according to an exemplary embodiment.

Fig. 8 is a block diagram of another brightness compensation device according to an exemplary embodiment.

Fig. 9 is a block diagram of another brightness compensation device according to an exemplary embodiment.

Detailed ways

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatuses and methods consistent with aspects of the present disclosure as recited in the appended claims.

The brightness compensation method provided in the present disclosure can be applied to any terminal with an under-screen camera display area. The distribution of the under-screen camera display area 1 and the non-under-screen camera display area 2 in the terminal display area may be shown in FIG. 1 . Fig. 1 is a schematic diagram showing a display area of a terminal according to an exemplary embodiment. In an example, the type of terminal may include a mobile terminal, such as a mobile phone, a tablet, a smart TV, a smart speaker with a screen, a smart watch with a screen, an ipod, and the like. In another example, the structure of the terminal may include: a double-sided screen terminal, a folding screen terminal, a full-screen terminal, and the like. The display brightness of the terminal's off-screen camera display area will decay with time and light intensity. The brightness compensation method provided in this disclosure is applicable to the case where the brightness attenuation between the display area of the terminal's off-screen camera and the display area of the non-screen camera is inconsistent after the terminal has been used for a period of time, which leads to differences in the display brightness of pixels in the two display areas. usage scenarios.

In the related art, when performing brightness compensation on the display area of the camera under the screen for the above usage scenarios, the compensation is performed in the following manner: through terminal processing or through an integrated circuit (integrated circuit, IC) statistics screen that controls the display area of the camera under the screen The display information and working hours of the display area of the lower camera. When the screen is off, the display information and data related to the working time are transmitted to the application processor (Application Processor, AP) of the terminal for recording. Therefore, when it is necessary to perform brightness compensation on a pixel, the statistical data is used to determine the pixel to be compensated through the aging model. However, when this method is used for compensation, the integrity of statistical data needs to be guaranteed. If part of the statistical data is missing, it will affect the accuracy of the statistical data, thereby affecting the compensation result.

In view of this, the present disclosure provides a brightness compensation method, which can perform brightness compensation on the display area of the camera under the screen based on the difference between the real-time display brightness of the display area of the camera under the screen and the reference display brightness, thereby making the compensation method of the screen brightness more accurate. Direct and simpler, it can perform targeted compensation for the real-time display brightness of the camera display area under the screen, so that the compensation result is more accurate.

Fig. 2 is a flowchart of a brightness compensation method according to an exemplary embodiment. As shown in FIG. 2, the brightness compensation method is used in a terminal, and includes the following steps S11 to S12.

In step S11 , in response to determining to perform brightness compensation on the display area of the camera under the screen of the terminal, a first display brightness and a second display brightness are determined.

In the embodiment of the present disclosure, the first display brightness and the second display brightness of the display area of the under-screen camera of the terminal are respectively determined in response to determining the demand for brightness compensation of the display area of the under-screen camera of the terminal. Wherein, the first display brightness is the reference display brightness of the display area of the camera under the screen, and the second display brightness is the real-time display brightness of the display area of the camera under the screen. The reference display brightness can be understood as a reference brightness for compensation for real-time display brightness. In an example, since the attenuation of the display brightness of the display area of the camera under the screen is related to the working time and display content, in order to improve the reliability of the reference display brightness, the first display area of the display area of the camera under the screen can be determined when the terminal leaves the factory. A display brightness, so that the obtained reference display brightness is more accurate and closer to the initial display brightness. The second display brightness can be understood as the display brightness at which the display area of the under-screen camera needs to determine whether to perform brightness compensation at any time during use.

In an example, the determination that brightness compensation is required for the display area of the camera under the screen of the terminal may be initiated by the user. In another example, as shown in FIG. 1 , determining the need for brightness compensation for the display area of the under-screen camera of the terminal may be that the terminal determines based on self-detection that brightness compensation is required for the display area of the current under-screen camera, and then sends a request to the user. , initiated by the user after confirming the request.

In step S12, based on the first display brightness and the second display brightness, brightness compensation is performed on the display area of the camera under the screen.

Through the above embodiment, based on the comparison between the first display brightness and the second display brightness, it is possible to determine the difference between the current display brightness of the display area of the camera under the screen and the first display brightness, and then determine the brightness of the display area of the camera under the screen Attenuation, so that when performing brightness compensation on the display area of the camera under the screen, targeted compensation can be performed, making the display brightness compensation method of the display area of the camera under the screen simpler and more direct.

The following embodiments will further illustrate the determination process of the first display brightness and the second display brightness.

Fig. 3 is a flow chart showing a brightness determination method according to an exemplary embodiment. As shown in FIG. 3 , the process of determining the first display brightness and the second display brightness includes the following steps.

In step S21, a plurality of test grayscale images are displayed time-sharingly in the display area of the camera under the screen.

In the embodiment of the present disclosure, since the degree of brightness attenuation of display pixels on the display screen is strongly related to the display content of the display screen, the longer the display screen is used, the higher the grayscale value displayed on the screen, and the faster the brightness attenuation speed of the display screen will be. quick. However, due to the different usage habits of each person, the degree of brightness attenuation is different. Therefore, in order to perform targeted compensation for the display area of the under-screen camera and determine the cause of brightness attenuation in the display area of the under-screen camera, multiple test grayscale images are sequentially displayed time-sharing. Wherein, different test grayscale images correspond to different attribute parameters. The attribute parameters include the backlight display brightness of the terminal when shooting the test grayscale image, the grayscale value displayed on the screen, and the reference grayscale value. It can be understood that the different test grayscale images are images captured by a camera when the brightness of the backlight display and the grayscale value of the screen display are different, and the obtained test grayscale images have different reference grayscale values. In an example, the display brightness of the backlight is related to controlling the size of the brightness value register (DBV) of the display area of the camera under the screen, and the size of the register has a linear relationship with the brightness of the screen. Therefore, by changing the size of the value in the register, the brightness of the backlight display can be changed. The screen display grayscale value is the grayscale value used to control the content of the terminal display screen.

In an implementation scenario, in order to reflect the brightness change of the display area of the camera under the screen to the greatest extent, it is possible to set the register value to the maximum value (2047) and the screen display grayscale value to the maximum value (255) , when the value of the register is set to the maximum value (2047) and the grayscale value of the screen display is set to the middle value (128), and the value of the register is set to the middle value (1024) and the grayscale value of the screen display is set to the maximum In the case of the value (255), multiple test grayscale images are obtained by taking pictures of the display area of the camera under the screen. Take a pixel block (block) whose pixel size is 6x6 in the display area of the camera under the screen as an example. Table 1 shows the correspondence between the values of the registers of each test grayscale image, the grayscale value displayed on the screen, and the reference grayscale value. Wherein, the reference gray scale value is represented by RGB.

Table 1

Based on the size of the register mentioned above, there is a linear relationship with the brightness of the screen. Therefore, the brightness of the backlight display of the terminal can be determined through the value of the register. When storing the attribute parameters of the test grayscale image, the display brightness of the backlight, the grayscale value displayed on the screen, and the reference grayscale value obtained by shooting are stored. In one example, the grayscale value displayed on the screen can be obtained by taking a screenshot.

In step S22, for each test gray-scale image among the plurality of test gray-scale images, based on the attribute parameters of the test gray-scale image, respectively, a reference display brightness and a real-time display brightness are determined, and a plurality of display brightness pairs are obtained.

In the embodiment of the present disclosure, in order to clarify the reason for the brightness attenuation of the display area of the camera under the screen, according to the attribute information of each test gray-scale image, determine the backlight display brightness of each test gray-scale image, the screen display gray-scale value, and the reference gray-scale value. Through the reference grayscale value, the reference display brightness of the display area of the camera under the screen can be determined when shooting the current test grayscale image. Through the brightness of the backlight display and the grayscale value displayed on the screen, it is possible to determine the value of the register that controls the brightness of the backlight display of the camera display area under the screen when shooting the current test grayscale image, and the grayscale value displayed on the screen, and then shoot in real time When the image is displayed, it can use the same backlight display brightness as the current test grayscale image, and the grayscale value displayed on the screen to shoot, and the real-time grayscale value of the real-time captured image is obtained, so that the real-time display determined according to the real-time grayscale value The luminance is comparable to the reference display luminance of the current test grayscale image, that is, a display luminance pair is obtained. Each display brightness pair includes a reference display brightness and a real-time display brightness determined based on the attribute parameters of the same test grayscale image. In the case of the same backlight display brightness and screen display grayscale value, through the display brightness pair, the brightness attenuation change of the screen display brightness with use can be reflected based on the comparison, so as to determine the change difference of the screen display brightness faster.

In step S23, the reference display brightness in the display brightness pair with the largest brightness difference ratio among the plurality of display brightness pairs is used as the first display brightness, and the display brightness in the display brightness pair with the largest brightness difference ratio among the plurality of display brightness pairs The real-time display brightness is used as the second display brightness.

In the embodiment of the present disclosure, since the attribute parameters of each test grayscale image are different, in different display brightness pairs, the brightness difference ratios between each reference display brightness and its corresponding real-time display brightness are different, so that through the respective The brightness difference ratio can clarify the factors that affect the brightness attenuation in the display area of the camera under the screen. Wherein, the brightness difference ratio is a ratio between the difference between the reference display brightness and the real-time display brightness and the reference display brightness. For example, if the reference display brightness is 500 nits and the real-time display brightness is 483 nits, then the brightness difference ratio is (500-483)/500=0.034=3.4%. If the brightness difference ratio is larger, it means that the backlight display brightness and screen display grayscale value used by the under-screen display camera display area when obtaining the display brightness pair have a greater impact on the display brightness of the under-screen display camera display area, and then The brightness attenuation effect on the display brightness of the display area of the under-screen display camera is greater. Therefore, when determining the display brightness pair that requires brightness compensation, the display brightness pair with the largest brightness difference ratio is taken as the display brightness pair that needs brightness compensation, and the display brightness pair with the largest brightness difference ratio is centered among the multiple display brightness pairs. The reference display brightness of is used as the first display brightness, and the real-time display brightness of the display brightness pair with the largest brightness difference ratio among multiple display brightness pairs is used as the second display brightness. For example: According to different test grayscale images, the brightness difference ratios corresponding to the obtained display brightness pairs are 2.6%, 1.8% and 2.2%, respectively, then select the display brightness pair corresponding to 2.6%.

In an embodiment, the reference display brightness can be determined based on the attribute parameters of the test grayscale image by using the brightness conversion curve. That is, based on the reference gray-scale value in the test gray-scale image attribute information, the screen display gray-scale value, and the light conversion curve, the display brightness corresponding to the reference gray-scale value is obtained, and the display brightness corresponding to the reference gray-scale value is determined as Baseline display brightness. In one example, the photoelectric conversion curve may be a Gamma curve. The Gamma curve is a special tone curve. When the Gamma value is equal to 1, the curve is a straight line at 45° to the coordinate axis, indicating that the input and output densities are the same. Gamma values above 1 will darken the output, and Gamma values below 1 will lighten the output. Each pixel in a digital image has a certain level of lightness, from black (0) to white (1). These pixel values are the information entered into the computer monitor. Displays can only output these values in a non-linear fashion, ie: output = input/gamma. Generally, when electro-optical conversion is performed for a display screen, the value of gamma (γ) is 2.2. The photoelectric conversion curve is the inverse operation of the electro-optic conversion curve. Therefore, when determining the benchmark display brightness based on the benchmark gray scale value captured by the camera, the value of γ is (1/2.2). Bringing the reference gray scale value and screen display gray scale value into the light conversion curve can determine the display brightness corresponding to the reference gray scale value, and then determine the reference display brightness according to the transmittance of the display area of the camera under the screen. For example: by bringing the reference gray scale value and the screen display gray scale value into the brightness conversion curve, the display brightness corresponding to the obtained reference gray scale value is 150 nit. According to the transmittance of the display area of the under-screen camera of 0.3, the current screen display brightness is 150/0.3=500nit.

In another embodiment, the process of determining the second display brightness may be as shown in FIG. 4 . Fig. 4 is a flow chart showing another brightness determination method according to an exemplary embodiment.

In step S31, based on the backlight display brightness in the test grayscale image attribute information and the grayscale value displayed on the screen, the camera under the screen is controlled to capture the display screen in the display area of the camera under the screen to obtain a captured image;

In step S32, based on the photographed grayscale value corresponding to the photographed image, the grayscale value displayed on the screen, and the light conversion curve, the display brightness corresponding to the photographed grayscale value is obtained, and the display brightness corresponding to the photographed grayscale value is determined as the first Two display brightness.

In an implementation scenario, take a backlight display brightness of 500 nit and a reference grayscale value of 250 as an example. Since the transmittance above the display area of the under-screen camera is 30%, the screen brightness received by the under-screen camera is 500*0.3=150nit, which corresponds to the reference grayscale value of 250. Through the photoelectric conversion curve formula: (Lv/Lvmax)^(1/2.2)*255=Gray; it can be seen that the maximum brightness received by the camera under the screen is Lvmax=156.7nit. When the captured grayscale value obtained by shooting is 246 grayscale, then according to the above formula, (Lv'/156.7)^(1/2.2)*255=246, it can be seen that under 246 grayscale, the grayscale value displayed on the screen (Lv') is 144.8nit. Furthermore, through the superimposed transmittance of 30%, it can be known that the display brightness corresponding to the shooting gray scale value is 144.8/0.3=483 nit. That is, the second display brightness is 483nit.

In an embodiment, to determine whether to perform brightness compensation on the display area of the under-screen camera, the brightness difference ratio between the first display brightness and the second display brightness may be compared with the first threshold for determination. The first threshold can be understood as the maximum threshold at which changes in brightness can be observed by human eyes. Under normal ambient light, the difference in brightness that can be discerned by the human eye is statistically 2%. That is, when the ambient light is 100nit, the brightness difference is 2nit, which can be distinguished by human eyes. In other words, when the brightness of the backlight display corresponding to the value of the register is 2047 is 500nit, and the screen display grayscale value is 255 grayscale, when the brightness of the display area of the camera under the screen drops to 490nit, (500*(1- 2%)) the difference is visible to the human eye. Therefore, the brightness difference ratio between the first display brightness and the second display brightness can be compared with the first threshold to determine whether the current brightness change can be perceived by human eyes, and further determine whether compensation is required.

If the luminance difference ratio between the first display luminance and the second display luminance is less than or equal to the first threshold, it indicates that the change of the luminance difference is not obvious and will not cause human visual perception. It is sufficient that the display brightness of the display area of the camera remains unchanged. If the luminance difference ratio between the first display luminance and the second display luminance is greater than the first threshold, it indicates that the change in luminance difference can cause the perception of human vision, and brightness compensation needs to be performed, thereby avoiding user experience. The brightness difference ratio between the first display brightness and the second display brightness, and the display brightness of the non-screen camera display area of the terminal are used to compensate the display brightness of the screen camera display area.

In an implementation scenario, when the value of the register is 2047, the backlight display brightness is 500 nit, and the screen display gray scale value is 255 gray scale, the reference gray scale value is 250 gray scale, and the reference display brightness is 500 nit. When the value of the register is 2047, the brightness of the backlight display is 500nit, and the grayscale value of the screen display is 255 grayscale. The obtained shooting grayscale value is 246 grayscale, and the corresponding real-time display brightness is 483nit. The brightness difference ratio between the first display brightness and the second display brightness is (500-483)/500>the first threshold (3%), then it needs to be based on the brightness difference ratio between the first display brightness and the second display brightness , and the display brightness of the non-screen camera display area of the terminal, and compensate the display brightness of the screen camera display area.

In an example, when the brightness of the backlight display is different from the grayscale value of the screen display, the maximum thresholds for human eyes to perceive brightness changes are different. Therefore, when determining the first threshold, targeted settings can be made according to the brightness of the backlight display and the grayscale value of the screen display. For example: when the value of the register is 2047 and the grayscale value displayed on the screen is 255 grayscale, the first threshold is set to 3%. When the value of the register is 2047 and the gray scale value displayed on the screen is 128 gray scales, the first threshold is set to 2%. When the value of the register is 1024 and the grayscale value displayed on the screen is 255 grayscale, the first threshold is set to 2%.

In another example, when acquiring the test grayscale image and capturing the image, the terminal may be placed in a completely dark environment, and the camera under the screen is not blocked by other obstacles. For example: placed in a black box with a certain height or in a completely black space. Furthermore, the obtained first display brightness and second display brightness can be more accurate, and it is easier to avoid light interference from other external environments, so that the subsequent brightness compensation is more accurate. And when shooting, use the same shooting parameters to shoot. For example: choose daylight for white balance, 1/60 for shutter time, and 300 for ISO to obtain test grayscale images and shooting images.

In an embodiment, when compensating the display brightness of the display area of the camera under the screen, the compensation can be performed by an IC. Based on the brightness difference ratio between the first display brightness and the second display brightness, the first compensation ratio of the backlight display brightness of the display area of the camera under the screen of the terminal can be determined, that is, the first compensation ratio for brightness compensation of the display area of the camera under the screen is clearly required. A compensation ratio, and then based on the linear relationship between the brightness and the value of the register, by compensating the backlight display brightness of the under-screen camera display area, the display brightness of the under-screen camera display area can be compensated, so that the compensated under-screen camera display area The display brightness is consistent with the display brightness of the non-screen camera display area. For example, by compensating the backlight display brightness of the under-screen camera display area, the display brightness of the under-screen camera display area can be increased, so that the display brightness of the non-under-screen camera display area is consistent with the display brightness of the under-screen camera display area.

Or, based on the brightness difference ratio between the first display brightness and the second display brightness, determine the second compensation ratio of the backlight display brightness of the non-screen camera display area of the terminal, that is, clearly need to perform brightness compensation on the non-screen camera display area The second compensation ratio, and then based on the linear relationship between the brightness and the value of the register, by compensating the backlight display brightness of the non-screen camera display area, the display brightness of the non-screen camera display area can be compensated, so that the compensated non-screen camera The display brightness of the display area of the lower camera is consistent with the display brightness of the display area of the camera under the screen. For example, by compensating the backlight display brightness of the display area of the non-screen camera, the display brightness of the display area of the camera under the screen can be reduced, so that the display brightness of the display area of the non-screen camera is consistent with the display brightness of the display area of the camera under the screen.

In yet another embodiment, when compensating the display brightness of the display area of the camera under the screen, compensation may be performed through the AP. The display brightness of the non-screen camera display area can be reduced by adding a mask layer, so that the display brightness of the non-screen camera display area can be consistent with the display brightness of the under-screen camera display area, thereby ensuring the terminal display area. Display brightness is able to remain consistent across the board.

In an implementation scenario, it may be as shown in FIG. 5 . Fig. 5 is an effect diagram showing display brightness of a display screen according to an exemplary embodiment. If the determined display brightness of the display area 1 of the under-screen camera is 180 nit, and the display brightness of the display area 2 of the non-screen camera is 200 nit, the display area of the non-screen camera is covered by the mask layer 3 to reduce the display of the non-screen camera. The display brightness of the area, so that the display brightness of the non-screen camera display area can be consistent with the display brightness of the under-screen camera display area. In one example, if the value of the register is 2047 and the grayscale value of the screen display is 255 grayscale, brightness compensation is performed by adding a mask layer, then based on the pre-determined value of 2047 in the register, the grayscale value of the screen display is 255. The first threshold value determined when the value is 255 gray scales determines the light transmittance covering the display area of the non-screen camera, so that the display brightness of the terminal display area after compensation can be kept consistent as a whole, and the gap between the two display areas is avoided. The difference in brightness between displays is too large, which affects the user experience. For example: if the first threshold value is 3%, the transmittance of the mask layer is 97%. If the first threshold is 2%, the transmittance of the covering layer is 98%.

In an implementation scenario, the process of performing brightness compensation for the display area of the camera under the terminal screen may be as shown in FIG. 6 . Fig. 6 is a flowchart of another brightness compensation method according to an exemplary embodiment.

In response to the user's detection instruction, the ambient light sensor in the terminal detects the surrounding environment of the terminal, and determines that the terminal is in a completely dark environment. When it is determined that the terminal is in a completely black environment, respond according to the determined demand for performing brightness compensation on the display area of the camera under the screen of the terminal. In the display area of the camera under the screen, multiple test grayscale images are displayed in time-sharing. For each test grayscale image, the corresponding real-time display image is captured by the camera under the screen. The first display brightness and the second display brightness are determined according to the brightness difference ratio between the reference display brightness of each test gray-scale image and the real-time display brightness of the real-time display image corresponding to each test gray-scale image. It is judged whether the brightness difference ratio between the first display brightness and the second display brightness is greater than a first threshold. If the brightness difference ratio between the first display brightness and the second display brightness is greater than the first threshold, perform brightness compensation on the display area of the camera under the screen, and prompt the user that the compensation has been completed. If the brightness difference ratio between the first display brightness and the second display brightness is less than or equal to the first threshold, the user is prompted that brightness compensation does not need to be performed on the display area of the under-screen camera.

Based on the same idea, an embodiment of the present disclosure further provides a brightness compensation device applied to a terminal.

It can be understood that, in order to realize the above functions, the brightness compensation device provided by the embodiments of the present disclosure includes corresponding hardware structures and/or software modules for performing various functions. Combining the units and algorithm steps of each example disclosed in the embodiments of the present disclosure, the embodiments of the present disclosure can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software drives hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the technical solutions of the embodiments of the present disclosure.

Fig. 7 is a block diagram of a brightness compensation device according to an exemplary embodiment. Referring to FIG. 7 , the brightness compensation device 100 includes a determination unit 101 and a compensation unit 102 .

The determining unit 101 is configured to determine a first display brightness and a second display brightness in response to determining to perform brightness compensation on the display area of the under-screen camera of the terminal. The first display brightness is the reference display brightness of the display area of the camera under the screen, and the second display brightness is the real-time display brightness of the display area of the camera under the screen.

The compensation unit 102 is configured to perform brightness compensation on the display area of the camera under the screen based on the first display brightness and the second display brightness.

In one embodiment, the determination unit 101 determines the first display brightness and the second display brightness in the following manner: in the display area of the camera under the screen, a plurality of test grayscale images are displayed in time division, and the test grayscale images correspond to attribute parameters, The attribute parameters include the backlight display brightness of the terminal when shooting the test grayscale image, the grayscale value displayed on the screen, and the reference grayscale value. For each test gray-scale image in the plurality of test gray-scale images, respectively based on the attribute parameters of the test gray-scale image, determine the reference display brightness and the real-time display brightness, and obtain a plurality of display brightness pairs, each display brightness pair includes The reference display brightness and the real-time display brightness determined by the attribute parameters of the same test grayscale image. The reference display brightness of the display brightness pair with the largest brightness difference ratio among multiple display brightness pairs is used as the first display brightness, and the real-time display brightness of the display brightness pair with the largest brightness difference ratio among multiple display brightness pairs is used as Secondary display brightness. The brightness difference ratio is the ratio of the difference between the reference display brightness and the real-time display brightness to the reference display brightness.

In another embodiment, the determination unit 101 determines the reference display brightness based on the attribute parameters of the test grayscale image in the following manner: based on the reference grayscale value, the screen display grayscale value, and the brightness in the attribute information of the test grayscale image convert the curve to obtain the display brightness corresponding to the reference gray scale value, and determine the display brightness corresponding to the reference gray scale value as the reference display brightness.

In yet another embodiment, the determination unit 101 determines the second display brightness in the following manner: based on the backlight display brightness in the test grayscale image attribute information and the screen display grayscale value, control the camera under the screen to match the brightness in the display area of the camera under the screen. The screen is displayed for shooting, and a captured image is obtained. Based on the captured gray scale value corresponding to the captured image, the screen displayed gray scale value, and the light conversion curve, the display brightness corresponding to the captured gray scale value is obtained, and the display brightness corresponding to the captured gray scale value is determined as the second display brightness.

In yet another embodiment, the compensation unit 102 performs brightness compensation on the display area of the camera under the screen based on the first display brightness and the second display brightness in the following manner: if the brightness difference between the first display brightness and the second display brightness is If the ratio is less than or equal to the first threshold, the display brightness of the display area of the camera under the screen remains unchanged. If the brightness difference ratio between the first display brightness and the second display brightness is greater than the first threshold, based on the brightness difference ratio between the first display brightness and the second display brightness, and the display brightness of the non-screen camera display area of the terminal , to compensate the display brightness of the display area of the camera under the screen.

In yet another embodiment, the compensation unit 102 uses the following method to adjust the brightness of the display area of the under-screen camera based on the brightness difference ratio between the first display brightness and the second display brightness, and the display brightness of the non-screen camera display area of the terminal. Display brightness compensation: Based on the brightness difference ratio between the first display brightness and the second display brightness, determine the first compensation ratio of the backlight display brightness of the display area of the camera under the terminal screen, or determine the backlight of the display area of the non-screen camera of the terminal Displays the brightness second compensation ratio. If the first compensation ratio of the backlight display brightness of the camera display area under the terminal screen is determined, based on the first compensation ratio and the display brightness of the non-screen camera display area of the terminal, by compensating the backlight display brightness of the camera display area under the screen, the screen Compensate for the display brightness of the display area of the lower camera. If the second compensation ratio of the backlight display brightness of the non-screen camera display area of the terminal is determined, based on the second compensation ratio and the display brightness of the non-screen camera display area of the terminal, by compensating the backlight display brightness of the non-screen camera display area, the The display brightness of the camera display area under the screen is compensated.

Regarding the apparatus in the foregoing embodiments, the specific manner in which each module executes operations has been described in detail in the embodiments related to the method, and will not be described in detail here.

Fig. 8 is a block diagram of another brightness compensation device according to an exemplary embodiment. For example, the brightness compensation device 200 may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, and the like.

8, brightness compensation device 200 may include one or more of the following components: processing component 202, memory 204, power component 206, multimedia component 208, audio component 210, input/output (I/O) interface 212, sensor component 214 , and the communication component 216.

The processing component 202 generally controls the overall operations of the brightness compensation apparatus 200, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing component 202 may include one or more processors 220 to execute instructions to complete all or part of the steps of the above method. Additionally, processing component 202 may include one or more modules that facilitate interaction between processing component 202 and other components. For example, processing component 202 may include a multimedia module to facilitate interaction between multimedia component 208 and processing component 202 .

The memory 204 is configured to store various types of data to support operations in the brightness compensation device 200 . Examples of such data include instructions for any application or method operating on the brightness compensation device 200, contact data, phonebook data, messages, images, videos, and the like. The memory 204 can be implemented by any type of volatile or non-volatile storage device or their combination, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable Programmable Read Only Memory (EPROM), Programmable Read Only Memory (PROM), Read Only Memory (ROM), Magnetic Memory, Flash Memory, Magnetic or Optical Disk.

The power component 206 provides power to various components of the brightness compensation device 200 . Power components 206 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for brightness compensation device 200 .

The multimedia component 208 includes a screen providing an output interface between the brightness compensation device 200 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from a user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensor may not only sense a boundary of a touch or swipe action, but also detect duration and pressure associated with the touch or swipe action. In some embodiments, the multimedia component 208 includes a front camera and/or a rear camera. When the brightness compensation device 200 is in an operation mode, such as a shooting mode or a video mode, the front camera and/or the rear camera can receive external multimedia data. Each front camera and rear camera can be a fixed optical lens system or have focal length and optical zoom capability.

The audio component 210 is configured to output and/or input audio signals. For example, the audio component 210 includes a microphone (MIC), which is configured to receive an external audio signal when the brightness compensation device 200 is in an operation mode, such as a call mode, a recording mode and a voice recognition mode. Received audio signals may be further stored in memory 204 or sent via communication component 216 . In some embodiments, the audio component 210 also includes a speaker for outputting audio signals.

The I/O interface 212 provides an interface between the processing component 202 and a peripheral interface module. The peripheral interface module may be a keyboard, a click wheel, a button, and the like. These buttons may include, but are not limited to: a home button, volume buttons, start button, and lock button.

The sensor assembly 214 includes one or more sensors for providing status assessments of various aspects of the brightness compensation device 200 . For example, the sensor assembly 214 can detect the on/off status of the brightness compensation device 200, the relative positioning of components, such as the display and the keypad of the brightness compensation device 200, and the sensor assembly 214 can also detect the brightness compensation device 200 or the brightness The position change of a component of the compensation device 200 , the presence or absence of user contact with the brightness compensation device 200 , the orientation or acceleration/deceleration of the brightness compensation device 200 and the temperature change of the brightness compensation device 200 . The sensor assembly 214 may include a proximity sensor configured to detect the presence of nearby objects in the absence of any physical contact. Sensor assembly 214 may also include an optical sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor component 214 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor or a temperature sensor.

The communication component 216 is configured to facilitate wired or wireless communication between the brightness compensation apparatus 200 and other devices. The brightness compensation device 200 can access a wireless network based on communication standards, such as WiFi, 2G or 3G, or a combination thereof. In an exemplary embodiment, the communication component 216 receives broadcast signals or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 216 also includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, Infrared Data Association (IrDA) technology, Ultra Wide Band (UWB) technology, Bluetooth (BT) technology and other technologies.

In an exemplary embodiment, the brightness compensation device 200 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field A Programmable Gate Array (FPGA), controller, microcontroller, microprocessor or other electronic component implementation for performing the methods described above.

In an exemplary embodiment, there is also provided a non-transitory computer-readable storage medium including instructions, such as the memory 204 including instructions, the instructions can be executed by the processor 220 of the brightness compensation device 200 to complete any of the above-mentioned brightness compensation method. For example, the non-transitory computer readable storage medium may be ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, optical data storage device, and the like.

Fig. 9 is a block diagram of another brightness compensation device according to an exemplary embodiment. For example, the brightness compensation device 300 may be provided as a server. Referring to FIG. 9 , the brightness compensation apparatus 300 includes a processing component 322 , which further includes one or more processors, and a memory resource represented by a memory 332 for storing instructions executable by the processing component 322 , such as application programs. The application program stored in memory 332 may include one or more modules each corresponding to a set of instructions. In addition, the processing component 322 is configured to execute instructions to perform any one of the brightness compensation methods described above.

The brightness compensation device 300 may also include a power supply component 326 configured to perform power management of the brightness compensation device 300, a wired or wireless network interface 350 configured to connect the brightness compensation device 300 to the network, and an input/output (I/O ) interface 358. The brightness compensation device 300 can operate based on an operating system stored in the memory 332, such as WindowsServerTM, MacOSXTM, UnixTM, LinuxTM, FreeBSDTM or the like.

It can be further understood that "plurality" in the present disclosure refers to two or more, and other quantifiers are similar thereto. "And/or" describes the association relationship of associated objects, indicating that there may be three types of relationships, for example, A and/or B may indicate: A exists alone, A and B exist simultaneously, and B exists independently. The character "/" generally indicates that the contextual objects are an "or" relationship. The singular forms "a", "said" and "the" are also intended to include the plural unless the context clearly dictates otherwise.

It can be further understood that the terms "first", "second", etc. are used to describe various information, but the information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another, and do not imply a specific order or degree of importance. In fact, expressions such as "first" and "second" can be used interchangeably. For example, without departing from the scope of the present disclosure, first information may also be called second information, and similarly, second information may also be called first information.

It can be further understood that, unless otherwise specified, "connection" includes a direct connection without other components between the two, and also includes an indirect connection between the two with other elements.

It can be further understood that although operations are described in a specific order in the drawings in the embodiments of the present disclosure, it should not be understood as requiring that these operations be performed in the specific order shown or in a serial order, or that Perform all operations shown to obtain the desired result. In certain circumstances, multitasking and parallel processing may be advantageous.

Other embodiments of the present disclosure will be readily apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, and these modifications, uses or adaptations follow the general principles of the present disclosure and include common knowledge or conventional technical means in the technical field not disclosed in the present disclosure . The specification and examples are to be considered as illustrative only, with the true scope and spirit of the disclosure indicated by the following claims.

It should be understood that the present disclosure is not limited to the precise constructions which have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the scope of the appended claims.

Claims (14)

1. An illumination compensation method applied to a terminal, the illumination compensation method comprising:

determining first display brightness and second display brightness in response to determining to perform brightness compensation on an under-screen camera display area of the terminal;

the first display brightness is the reference display brightness of the display area of the lower screen camera, and the second display brightness is the real-time display brightness of the display area of the lower screen camera;

and performing brightness compensation on the display area of the lower screen camera based on the first display brightness and the second display brightness.

2. The luminance compensation method of claim 1, wherein the determining the first display luminance and the second display luminance comprises:

displaying a plurality of test gray scale images in a time-sharing manner in the display area of the camera under the screen, wherein the test gray scale images correspond to attribute parameters, and the attribute parameters comprise backlight display brightness, a screen display gray scale value and a reference gray scale value of the terminal when the test gray scale images are shot;

determining reference display brightness and real-time display brightness respectively based on the attribute parameters of the test gray scale images aiming at each test gray scale image in the test gray scale images, and obtaining a plurality of display brightness pairs, wherein each display brightness pair comprises the reference display brightness and the real-time display brightness determined based on the attribute parameters of the same test gray scale image;

taking the reference display brightness in the display brightness pair with the maximum brightness difference ratio among the plurality of display brightness pairs as first display brightness, and taking the real-time display brightness in the display brightness pair with the maximum brightness difference ratio among the plurality of display brightness pairs as second display brightness;

the brightness difference ratio is a ratio between a difference between the reference display brightness and the real-time display brightness and the reference display brightness.

3. The luminance compensation method according to claim 2, wherein the determining the reference display luminance based on the attribute parameter of the test gray-scale image comprises:

and obtaining the display brightness corresponding to the reference gray scale value based on the reference gray scale value, the screen display gray scale value and the brightness conversion curve in the test gray scale image attribute information, and determining the display brightness corresponding to the reference gray scale value as the reference display brightness.

4. The luminance compensation method of claim 2, wherein the determining the second display luminance comprises:

controlling the under-screen camera to shoot a display picture in a display area of the under-screen camera based on the backlight display brightness and the screen display gray scale value in the test gray scale image attribute information to obtain a shot image;

and obtaining the display brightness corresponding to the shooting gray scale value based on the shooting gray scale value corresponding to the shot image, the screen display gray scale value and the brightness conversion curve, and determining the display brightness corresponding to the shooting gray scale value as second display brightness.

5. The brightness compensation method according to claim 1, wherein the performing brightness compensation on the display area of the off-screen camera based on the first display brightness and the second display brightness comprises:

if the brightness difference ratio between the first display brightness and the second display brightness is smaller than or equal to a first threshold value, keeping the display brightness of the display area of the camera under the screen unchanged;

and if the brightness difference ratio between the first display brightness and the second display brightness is larger than the first threshold value, compensating the display brightness of the display area of the lower screen camera based on the brightness difference ratio between the first display brightness and the second display brightness and the display brightness of the non-lower screen camera display area of the terminal.

6. The brightness compensation method of claim 5, wherein the compensating the display brightness of the off-screen camera display area based on the brightness difference ratio between the first display brightness and the second display brightness and the display brightness of the non-off-screen camera display area of the terminal comprises:

determining a first compensation ratio of the backlight display brightness of the display area of the camera under the screen of the terminal or determining a second compensation ratio of the backlight display brightness of the display area of the camera under the non-screen of the terminal based on the brightness difference ratio between the first display brightness and the second display brightness;

if a first compensation ratio of the backlight display brightness of the display area of the camera under the screen of the terminal is determined, compensating the display brightness of the display area of the camera under the screen by compensating the backlight display brightness of the display area of the camera under the screen based on the first compensation ratio and the display brightness of the display area of the camera under the non-screen of the terminal;

and if a second compensation ratio of the backlight display brightness of the non-screen camera display area of the terminal is determined, compensating the display brightness of the non-screen camera display area by compensating the backlight display brightness of the non-screen camera display area based on the second compensation ratio and the display brightness of the non-screen camera display area of the terminal.

7. An illumination compensation apparatus applied to a terminal, the illumination compensation apparatus comprising:

the determining unit is used for responding to the determination of brightness compensation of the display area of the camera under the screen of the terminal and determining first display brightness and second display brightness;

the first display brightness is the reference display brightness of the display area of the lower screen camera, and the second display brightness is the real-time display brightness of the display area of the lower screen camera;

and the compensation unit is used for performing brightness compensation on the display area of the camera under the screen based on the first display brightness and the second display brightness.

8. The luminance compensation apparatus according to claim 7, wherein the determination unit determines the first display luminance and the second display luminance in such a manner that:

displaying a plurality of test gray scale images in a time-sharing manner in the display area of the camera under the screen, wherein the test gray scale images correspond to attribute parameters, and the attribute parameters comprise backlight display brightness, a screen display gray scale value and a reference gray scale value of the terminal when the test gray scale images are shot;

determining reference display brightness and real-time display brightness respectively based on the attribute parameters of the test gray scale images aiming at each test gray scale image in the test gray scale images, and obtaining a plurality of display brightness pairs, wherein each display brightness pair comprises the reference display brightness and the real-time display brightness determined based on the attribute parameters of the same test gray scale image;

taking the reference display brightness in the display brightness pair with the maximum brightness difference ratio among the plurality of display brightness pairs as first display brightness, and taking the real-time display brightness in the display brightness pair with the maximum brightness difference ratio among the plurality of display brightness pairs as second display brightness;

the brightness difference ratio is a ratio between a difference between the reference display brightness and the real-time display brightness and the reference display brightness.

9. The luminance compensation apparatus as claimed in claim 8, wherein the determining unit determines the reference display luminance based on the attribute parameter of the test grayscale image by:

and obtaining the display brightness corresponding to the reference gray scale value based on the reference gray scale value, the screen display gray scale value and the brightness conversion curve in the test gray scale image attribute information, and determining the display brightness corresponding to the reference gray scale value as the reference display brightness.

10. The luminance compensation device according to claim 8, wherein the determination unit determines the second display luminance in the following manner:

controlling the under-screen camera to shoot a display picture in a display area of the under-screen camera based on the backlight display brightness and the screen display gray scale value in the test gray scale image attribute information to obtain a shot image;

and obtaining the display brightness corresponding to the shooting gray scale value based on the shooting gray scale value corresponding to the shot image, the screen display gray scale value and the brightness conversion curve, and determining the display brightness corresponding to the shooting gray scale value as second display brightness.

11. The luminance compensation device according to claim 7, wherein the compensation unit performs luminance compensation on the display area of the off-screen camera based on the first display luminance and the second display luminance in the following manner:

if the brightness difference ratio between the first display brightness and the second display brightness is smaller than or equal to a first threshold value, keeping the display brightness of the display area of the camera under the screen unchanged;

and if the brightness difference ratio between the first display brightness and the second display brightness is larger than the first threshold value, compensating the display brightness of the display area of the camera under the screen based on the brightness difference ratio between the first display brightness and the second display brightness and the display brightness of the non-screen camera display area of the terminal.

12. The luminance compensation apparatus as claimed in claim 11, wherein the compensation unit compensates the display luminance of the off-screen camera display area based on the luminance difference ratio between the first display luminance and the second display luminance, and the display luminance of the non-off-screen camera display area of the terminal by:

determining a first compensation ratio of the backlight display brightness of the camera display area under the terminal screen or determining a second compensation ratio of the backlight display brightness of the camera display area under the terminal non-screen based on the brightness difference ratio between the first display brightness and the second display brightness;

if a first compensation ratio of the backlight display brightness of the display area of the camera under the screen of the terminal is determined, compensating the display brightness of the display area of the camera under the screen by compensating the backlight display brightness of the display area of the camera under the screen based on the first compensation ratio and the display brightness of the display area of the camera under the non-screen of the terminal;

and if a second compensation ratio of the backlight display brightness of the non-screen camera display area of the terminal is determined, compensating the display brightness of the non-screen camera display area by compensating the backlight display brightness of the non-screen camera display area based on the second compensation ratio and the display brightness of the non-screen camera display area of the terminal.

13. A luminance compensation apparatus, characterized in that the luminance compensation apparatus comprises:

a memory to store instructions; and

a processor for invoking the memory-stored instructions to perform the illumination compensation method of any of claims 1-6.

14. A computer readable storage medium having stored therein instructions which, when executed by a processor, perform a brightness compensation method according to any one of claims 1-6.

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