Partition dimming control method, device, terminal equipment and storage medium

Abstract

The embodiment of the present invention discloses a partition dimming control method, device, terminal device and storage medium. The method is used for a liquid crystal display device, wherein the backlight of the liquid crystal display device is divided into a plurality of backlight areas, and comprises: inputting the brightness channel of the original input image to be displayed into a pre-trained backlight extraction model, and outputting a backlight information matrix, wherein the row and column parameters of the backlight information matrix are the same as the row and column parameters of the backlight area; simulating the light intensity distribution of the backlight according to the backlight information matrix, and calculating the compensation result image corresponding to the original input image based on the light intensity distribution; controlling the brightness of the corresponding backlight area according to the backlight information matrix, and controlling the display of the compensation result image. From the perspective of the best low-resolution representation of the brightness of the original area image, the backlight information matrix is ​​generated by the partitioning method of the backlight area corresponding to the backlight extraction model, which can adapt to image content in a larger range and effectively reduce the probability of image artifacts.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of display technology, and in particular to a zone dimming control method, device, terminal equipment and storage medium. Background Art

[0002] In liquid crystal display, the light source in the backlight panel emits light, and the light carries the corresponding channel color after passing through the filter. Finally, the light output of each channel is controlled by adjusting the angle of the liquid crystal to display the image. For the backlight panel, because the display brightness of different areas of the image is different, it is usually necessary to divide the light source into multiple areas to achieve the luminous display of the corresponding image area as much as possible. This process of dividing the light source into multiple areas for luminous control is called zone dimming. Based on zone dimming, the image display process can be divided into the following steps: backlight control, that is, extracting image brightness features from the input image, and determining the brightness value of the light source in each area of ​​the backlight panel according to the image brightness features; backlight smoothing, that is, estimating the diffusion function of the backlight diffuser, smoothing the backlight information, and obtaining the light intensity distribution of the backlight panel; pixel compensation, that is, obtaining the pixel compensation information of the input image according to the light intensity distribution. Finally, the image is displayed based on the pixel compensation information.

[0003] The mainstream methods of the existing backlight control part include the maximum method, the mean method, the fusion of the maximum and mean, the square root method, etc. The maximum method is easily affected by noise; the mean method will reduce the overall brightness and bring about the problem of dynamic range compression; the weighted LUT method of the fusion of the maximum and mean provides a certain improvement to the above methods. The above methods all achieve a value that can represent the brightness of the current block from the pixel mean to the pixel maximum value of the image block corresponding to the backlight panel as the backlight value of the corresponding partition.

[0004] When implementing zone dimming control based on the above method, the inventors found that the existing solution has a small adaptability range for image content, and has a high probability of image artifacts appearing for images outside the adaptability range. Summary of the invention

[0005] The present invention provides a zone dimming control method, device, terminal equipment and storage medium to solve the technical problems that the existing zone dimming has a small adaptability range for image content and a high probability of image artifacts appearing for images outside the adaptability range.

[0006] In a first aspect, an embodiment of the present invention provides a zone dimming control method for a liquid crystal display device, wherein the backlight of the liquid crystal display device is divided into a plurality of backlight areas, the method comprising:

[0007] Inputting the brightness channel of the original input image to be displayed into a pre-trained backlight extraction model, and outputting a backlight information matrix, wherein the row and column parameters of the backlight information matrix are the same as the row and column parameters of the backlight area;

[0008] Simulating the light intensity distribution of the backlight according to the backlight information matrix, and calculating the compensation result image corresponding to the original input image based on the light intensity distribution;

[0009] The brightness of the corresponding backlight area is controlled according to the backlight information matrix, and the compensation result image is controlled to be displayed.

[0010] In a second aspect, an embodiment of the present invention further provides a zone dimming control device for a liquid crystal display device, wherein the backlight of the liquid crystal display device is divided into a plurality of backlight areas, the device comprising:

[0011] A backlight extraction unit, used for inputting the brightness channel of the original input image to be displayed into a pre-trained backlight extraction model, and outputting a backlight information matrix, wherein the row and column parameters of the backlight information matrix are the same as the row and column parameters of the backlight area;

[0012] An image compensation unit, configured to simulate the light intensity distribution of the backlight according to a backlight information matrix, and calculate a compensation result image corresponding to the original input image based on the light intensity distribution;

[0013] An image rendering unit is used to control the brightness of the corresponding backlight area according to the backlight information matrix, and control the display of the compensation result image.

[0014] In a third aspect, an embodiment of the present invention further provides a terminal device, including:

[0015] one or more processors;

[0016] A memory for storing one or more programs;

[0017] When the one or more programs are executed by the one or more processors, the terminal device implements the zone dimming control method as described in the first aspect.

[0018] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the zone dimming control method as described in the first aspect.

[0019] The above-mentioned partition dimming control method, device, terminal device and storage medium, the method is used for a liquid crystal display device, the backlight of the liquid crystal display device is divided into multiple backlight areas, and it includes: inputting the brightness channel of the original input image to be displayed into a pre-trained backlight extraction model, and outputting a backlight information matrix, the row and column parameters of the backlight information matrix are the same as the row and column parameters of the backlight area; simulating the light intensity distribution of the backlight according to the backlight information matrix, and calculating the compensation result image corresponding to the original input image based on the light intensity distribution; controlling the brightness of the corresponding backlight area according to the backlight information matrix, and controlling the display of the compensation result image. From the perspective of the best low-resolution representation of the brightness of the original area image, the backlight information matrix is ​​generated by the partitioning method of the backlight area corresponding to the backlight extraction model, which can adapt to image content in a larger range and effectively reduce the probability of image artifacts. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A method flow chart of a zone dimming control method provided by an embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of an interactive tablet;

[0022] Figure 3 A schematic diagram of the backlight of an interactive flat panel;

[0023] Figure 4 is the original input image to be displayed;

[0024] Figure 5 To correspond to Figure 4 Schematic diagram of backlight information matrix;

[0025] Figure 6 For backlight corresponding to Figure 5 Schematic diagram of light intensity distribution;

[0026] Figure 7 To compensate the result image;

[0027] Figure 8 A schematic diagram of the structure of a zone dimming control device provided by an embodiment of the present invention;

[0028] Fig. 9 A schematic diagram of the structure of a terminal device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0030] It should be noted that due to space limitations, this application description does not list all optional implementation methods. After reading this application description, those skilled in the art should be able to understand that as long as the technical features do not contradict each other, any combination of technical features can constitute an optional implementation method.

[0031] Each embodiment is described in detail below.

[0032] Figure 1 A method flow chart of a partition dimming control method provided by an embodiment of the present invention, the partition dimming control method is used for a liquid crystal display device, the backlight of the liquid crystal display device is divided into a plurality of backlight areas, as shown in the figure, the partition dimming control method includes:

[0033] Step S110: input the brightness channel of the original input image to be displayed into the pre-trained backlight extraction model, and output a backlight information matrix, wherein the row and column parameters of the backlight information matrix are the same as the row and column parameters of the backlight area.

[0034] In a liquid crystal display device, the backlight source does not always output light of the same brightness. Instead, the backlight is divided into multiple backlight areas. The brightness of each backlight area is determined based on the actual image content displayed. The specific way to divide the backlight area is determined according to the product form and display effect requirements of the liquid crystal display device. For example Figure 2 The product form of the liquid crystal display device shown is an interactive flat panel 1; Figure 3 The backlight 10 of the shown liquid crystal display device is divided into 24 backlight areas 11, each backlight area 11 has multiple light sources 111, and generally speaking, with the same backlight 10 size, the higher the display control precision, the more backlight areas 11 there are, and the smaller the area of ​​each backlight area 11.

[0035] Because of the luminous characteristics of the light source, it is not necessary and impossible to directly control the brightness of each pixel based on the existing brightness channel of the original input image to be displayed. Therefore, it is necessary to process the brightness channel of the original input image based on the backlight area. On the whole, the display range of the original input image corresponds to the luminous range of the backlight. Correspondingly, the row and column parameters of the backlight information matrix corresponding to the original input image are the same as the row and column parameters of the backlight area. For example, if the resolution of the original input image is 1024×768, and the backlight is divided into 8×6=48 backlight areas, then the original input image is divided into 8×6=48 small image areas, each image area has 128×128 pixels, that is, each backlight area corresponds to 128×128 pixels. Through the backlight extraction model, each pixel area corresponds to an element in the backlight information matrix.

[0036] Regarding the backlight extraction model, training can be performed through the following steps:

[0037] Construct a training image sample set and a backlight extraction network to be trained;

[0038] Inputting the brightness channels of the training sample images in the training image sample set into the backlight extraction network to be trained in sequence, and outputting the corresponding backlight information matrix;

[0039] Inputting the backlight information matrix into a preset super-resolution model and outputting a corresponding reconstructed brightness map;

[0040] The completion of the backlight extraction model training is confirmed according to a loss function constructed based on the reconstructed brightness map and the brightness channel of the corresponding training sample image.

[0041] The training image sample set can be constructed based on a public data set. The backlight extraction network is only used to extract data from the brightness channel of the training sample image. The specific basic network structure can be a commonly used convolutional neural network, a forward feedback network, etc. During the training process, the backlight extraction network to be trained inputs the training sample image, and outputs a backlight information matrix based on the set row and column parameters. Before the training is completed, the backlight information matrix cannot truly express the data information of the brightness channel. It is necessary to reconstruct the image based on the super-resolution model, and judge the training completion of the backlight extraction model based on the loss function. In general, the closer the reconstructed image is to the corresponding original image, the higher the training completion. The specific training completion is judged by the loss function.

[0042] In this solution, the loss function is specifically:

[0043]

[0044]

[0045] Among them, L represents the loss, N represents the number of training sample images, and I i Represents the brightness channel of the i-th training sample image, I i ' represents the reconstructed brightness image corresponding to the i-th training sample image, h represents the height of the backlight information matrix, w represents the width of the backlight information matrix, and c represents the number of channels of the backlight information matrix; i,j,k represents the value of the (i, j) position of the kth channel in the backlight information matrix, and λ represents the regularization hyperparameter.

[0046] From the perspective of the optimal low-resolution representation of the original image brightness by the backlight information matrix, compared with existing methods, it can widely adapt to different content images in terms of the low power consumption and wide dynamic range expected to be achieved by zone dimming; and by using TV regularization to constrain the backlight information matrix, a smoother backlight information matrix can be generated, which helps to improve the subjective effect of the zone dimming image and avoid image artifacts.

[0047] Step S120: simulating the light intensity distribution of the backlight according to the backlight information matrix, and calculating the compensation result image corresponding to the original input image based on the light intensity distribution.

[0048] In the specific implementation process, the light intensity distribution is obtained by upsampling the backlight information matrix and convolving the backlight diffusion function. The backlight diffusion function uses the measured LSF (Line Spread Function), for example:

[0049]

[0050] Based on the light intensity distribution of the backlight, the compensation result image is calculated as follows:

[0051]

[0052] Among them, GL output Represents the compensation result image, GL input Represents the original input image to be displayed, BL full Indicates the maximum brightness of the backlight, BL reduced represents the light intensity distribution, and γ represents the gamma factor of the liquid crystal display device.

[0053] In a specific calculation, the maximum brightness value of the backlight may be 255, and the gamma factor refers to the gamma factor of the liquid crystal display screen of the liquid crystal display device, for example, 2.2.

[0054] Step S130: controlling the brightness of the corresponding backlight area according to the backlight information matrix, and controlling the display of the compensation result image.

[0055] In the specific display process, the brightness of the corresponding backlight area is controlled according to the backlight information matrix, and the liquid crystal deflection is controlled according to the compensation result image to realize the final image display.

[0056] For example, the original input image to be displayed is Figure 4 After inputting it into the pre-trained backlight extraction model, the brightness effect corresponding to the backlight information matrix is ​​obtained as follows Figure 5 As shown, according to Figure 5 The backlight information matrix shown in the figure can be simulated to obtain the following Figure 6 The light intensity distribution shown is based on Figure 6 The light intensity distribution shown can be obtained as Figure 7 The compensation result image shown is finally displayed as a complete image based on the backlight information matrix and the compensation result image.

[0057] The above method is used for a liquid crystal display device, wherein the backlight of the liquid crystal display device is divided into a plurality of backlight areas, and comprises: inputting the brightness channel of the original input image to be displayed into a pre-trained backlight extraction model, and outputting a backlight information matrix, wherein the row and column parameters of the backlight information matrix are the same as the row and column parameters of the backlight area; simulating the light intensity distribution of the backlight according to the backlight information matrix, and calculating the compensation result image corresponding to the original input image based on the light intensity distribution; controlling the brightness of the corresponding backlight area according to the backlight information matrix, and controlling the display of the compensation result image. From the perspective of the best low-resolution representation of the brightness of the original area image, the backlight information matrix is ​​generated by the partitioning method of the backlight area corresponding to the backlight extraction model, which can adapt to image content in a larger range and effectively reduce the probability of image artifacts.

[0058] Figure 8 Schematic diagram of the structure of a zone dimming control device provided by an embodiment of the present invention. The zone dimming control device is used for a liquid crystal display device, wherein the backlight of the liquid crystal display device is divided into a plurality of backlight areas. Figure 8 The partition dimming control device includes a backlight extraction unit 210, an image compensation unit 220 and an image rendering unit 230.

[0059] Among them, the backlight extraction unit 210 is used to input the brightness channel of the original input image to be displayed into the pre-trained backlight extraction model, and output a backlight information matrix, the row and column parameters of the backlight information matrix are the same as the row and column parameters of the backlight area; the image compensation unit 220 is used to simulate the light intensity distribution of the backlight according to the backlight information matrix, and calculate the compensation result image corresponding to the original input image based on the light intensity distribution; the image rendering unit 230 is used to control the brightness of the corresponding backlight area according to the backlight information matrix, and control the display of the compensation result image.

[0060] Based on the above embodiment, the backlight extraction model is trained through the following steps:

[0061] Construct a training image sample set and a backlight extraction network to be trained;

[0062] Inputting the brightness channels of the training sample images in the training image sample set into the backlight extraction network to be trained in sequence, and outputting the corresponding backlight information matrix;

[0063] Inputting the backlight information matrix into a preset super-resolution model and outputting a corresponding reconstructed brightness map;

[0064] The completion of the backlight extraction model training is confirmed according to a loss function constructed based on the reconstructed brightness map and the brightness channel of the corresponding training sample image.

[0065] Based on the above embodiment, the loss function is specifically:

[0066]

[0067]

[0068] Among them, L represents the loss, N represents the number of training sample images, and I i Represents the brightness channel of the i-th training sample image, I i ' represents the reconstructed brightness image corresponding to the i-th training sample image, h represents the height of the backlight information matrix, w represents the width of the backlight information matrix, and c represents the number of channels of the backlight information matrix; i,j,k represents the value of the (i, j) position of the kth channel in the backlight information matrix, and λ represents the regularization hyperparameter.

[0069] Based on the above embodiment, the light intensity distribution is obtained by up-sampling the backlight information matrix and convolving the backlight panel diffusion function.

[0070] Based on the above embodiment, the compensation result image is calculated in the following way:

[0071]

[0072] Among them, GL output Represents the compensation result image, GL input Represents the original input image to be displayed, BL full Indicates the maximum brightness of the backlight, BL reduced represents the light intensity distribution, and γ represents the gamma factor of the liquid crystal display device.

[0073] The zone dimming control device provided in the embodiment of the present invention is included in the electronic device of the device, and can be used to execute any zone dimming control method provided in the above embodiments, and has corresponding functions and beneficial effects.

[0074] It is worth noting that in the embodiment of the above-mentioned zone dimming control device, the various units and modules included are only divided according to functional logic, but are not limited to the above-mentioned division, as long as the corresponding functions can be achieved; in addition, the specific names of the functional units are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of the present invention.

[0075] Fig. 9 A schematic diagram of the structure of a terminal device provided by an embodiment of the present invention. Fig. 9 As shown, the terminal device includes a processor 310, a memory 320, an input device 330, an output device 340 and a communication device 350; the number of processors 310 in the terminal device can be one or more. Fig. 9 A processor 310 is taken as an example; the processor 310, the memory 320, the input device 330, the output device 340 and the communication device 350 in the terminal device can be connected via a bus or other means. Fig. 9 The example of connecting through bus is taken in the following.

[0076] The memory 320, as a computer-readable storage medium, can be used to store software programs, computer executable programs and modules, such as program instructions / modules corresponding to the partition dimming control method in the embodiment of the present invention (for example, the backlight extraction unit 210, the image compensation unit 220 and the image rendering unit 230 in the partition dimming control device). The processor 310 executes various functional applications and data processing of the terminal device by running the software programs, instructions and modules stored in the memory 320, that is, realizing the above-mentioned partition dimming control method.

[0077] The memory 320 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system and at least one application required for a function; the data storage area may store data created according to the use of the terminal device, etc. In addition, the memory 320 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some instances, the memory 320 may further include a memory remotely arranged relative to the processor 310, and these remote memories may be connected to the terminal device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0078] The input device 330 may be used to receive input digital or character information and generate key signal input related to user settings and function control of the terminal device. The output device 340 may include a display device such as a display screen.

[0079] The above-mentioned terminal device includes a zone dimming control device, which can be used to execute any zone dimming control method and has corresponding functions and beneficial effects.

[0080] An embodiment of the present invention also provides a storage medium containing computer executable instructions, which, when executed by a computer processor, are used to perform relevant operations in the zone dimming control method provided in any embodiment of the present application, and have corresponding functions and beneficial effects.

[0081] Those skilled in the art should understand that the embodiments of the present application may be provided as methods, systems, or computer program products.

[0082] Therefore, the present application may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the functions in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing device to work in a specific way, so that the instructions stored in the computer-readable memory produce a product including an instruction device, which implements the functions specified in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide for implementing the process in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0083] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory. The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0084] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0085] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0086] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A zone dimming control method for a liquid crystal display device, wherein the backlight of the liquid crystal display device is divided into a plurality of backlight zones, characterized in that: include: Inputting the brightness channel of the original input image to be displayed into a pre-trained backlight extraction model, and outputting a backlight information matrix, wherein the row and column parameters of the backlight information matrix are the same as the row and column parameters of the backlight area; Simulating the light intensity distribution of the backlight according to the backlight information matrix, and calculating the compensation result image corresponding to the original input image based on the light intensity distribution; Controlling the brightness of the corresponding backlight area according to the backlight information matrix, and controlling the display of the compensation result image; The backlight extraction model is trained through the following steps: Construct a training image sample set and a backlight extraction network to be trained; Inputting the brightness channels of the training sample images in the training image sample set into the backlight extraction network to be trained in sequence, and outputting the corresponding backlight information matrix; Inputting the backlight information matrix into a preset super-resolution model and outputting a corresponding reconstructed brightness map; Confirming that the backlight extraction model training is completed according to a loss function constructed based on the reconstructed brightness map and the brightness channel of the corresponding training sample image; The loss function is specifically: Among them, L represents the loss, N represents the number of training sample images, and I i Represents the brightness channel of the i-th training sample image, I i ' represents the reconstructed brightness image corresponding to the i-th training sample image, h represents the height of the backlight information matrix, w represents the width of the backlight information matrix, and c represents the number of channels of the backlight information matrix; i,j,k represents the value of the (i, j) position of the kth channel in the backlight information matrix, and λ represents the regularization hyperparameter.

2. The method according to claim 1, characterized in that The light intensity distribution is obtained by up-sampling the backlight information matrix and convolving the backlight panel diffusion function.

3. The method according to claim 2, characterized in that The compensation result image is calculated in the following way: Among them, GL output Represents the compensation result image, GL input Represents the original input image to be displayed, BL full Indicates the maximum brightness of the backlight, BL reduced represents the light intensity distribution, and γ represents the gamma factor of the liquid crystal display device.

4. A zone dimming control device, used for a liquid crystal display device, wherein the backlight of the liquid crystal display device is divided into a plurality of backlight zones, characterized in that: include: A backlight extraction unit, used for inputting the brightness channel of the original input image to be displayed into a pre-trained backlight extraction model, and outputting a backlight information matrix, wherein the row and column parameters of the backlight information matrix are the same as the row and column parameters of the backlight area; An image compensation unit, configured to simulate the light intensity distribution of the backlight according to a backlight information matrix, and calculate a compensation result image corresponding to the original input image based on the light intensity distribution; An image rendering unit, used for controlling the brightness of the corresponding backlight area according to the backlight information matrix, and controlling the display of the compensation result image; The backlight extraction model is trained through the following steps: Construct a training image sample set and a backlight extraction network to be trained; Inputting the brightness channels of the training sample images in the training image sample set into the backlight extraction network to be trained in sequence, and outputting the corresponding backlight information matrix; Inputting the backlight information matrix into a preset super-resolution model and outputting a corresponding reconstructed brightness map; Confirming that the backlight extraction model training is completed according to a loss function constructed based on the reconstructed brightness map and the brightness channel of the corresponding training sample image; The loss function is specifically: Among them, L represents the loss, N represents the number of training sample images, and I i Represents the brightness channel of the i-th training sample image, I i ' represents the reconstructed brightness image corresponding to the i-th training sample image, h represents the height of the backlight information matrix, w represents the width of the backlight information matrix, and c represents the number of channels of the backlight information matrix; i,j,k represents the value of the (i, j) position of the kth channel in the backlight information matrix, and λ represents the regularization hyperparameter.

5. A terminal device, characterized in that: include: one or more processors; A memory for storing one or more programs; When the one or more programs are executed by the one or more processors, the terminal device implements the zone dimming control method as described in any one of claims 1-3.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the zone dimming control method as described in any one of claims 1 to 3 is implemented.

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