Brightness adjustment method and apparatus for low-partition backlight display device, display device

Abstract

The application relates to the technical field of intelligent household appliances, and discloses a brightness adjustment method and device for a low-partition backlight display device and a display device. The brightness adjustment method comprises the following steps: according to a physical backlight partition layout of a display device, an input image of a current frame is divided into a plurality of corresponding logical regions; original brightness features of each logical region and global brightness features of the whole frame input image are extracted; according to the original brightness features of each logical region, the global brightness features and content perception weights corresponding to each logical region, initial target brightness values of each logical region are calculated; for each initial target brightness value, spatial domain smoothing processing and time domain smoothing processing are sequentially performed, backlight driving values of each logical region are determined, and the luminous brightness of the corresponding physical backlight partition is controlled according to each backlight driving value. The application can improve the image display effect of the low-partition backlight display device.

Description

Technical Field

[0001] This application relates to the field of smart home appliance technology, such as a brightness adjustment method and apparatus for low-zone backlight display devices, and a display device. Background Technology

[0002] Currently, liquid crystal displays (LCDs) are widely used due to their advantages in power consumption and resolution. In LCD displays, since the LCD panel itself does not emit light, a backlight is required to display images.

[0003] In related technologies, in order to effectively improve the display image effect (image quality and contrast, etc.) of display devices, local dimming backlight control technology is adopted. By dividing the backlight panel into multiple independent and controllable areas, the brightness of each area is dynamically adjusted according to the display content to achieve better image display effect.

[0004] In the process of implementing the embodiments of this disclosure, it was found that the related technology has at least the following technical problems: For low-zone backlighting displays with a limited number of zones (typically less than 200), each physical backlight zone needs to control a relatively large screen area due to the limited number of zones. This can lead to problems such as halos, abrupt brightness jumps, and loss of detail in dark areas when displaying high-contrast or images with varying brightness levels, resulting in poor image display quality. Therefore, improving the image display quality of low-zone backlighting displays has become a pressing technical problem that needs to be solved.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0006] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0007] This disclosure provides a brightness adjustment method and apparatus for a low-zone backlight display device, as well as a display device, which can reduce the risk of problems such as halo, abrupt brightness jumps, and loss of dark field details when displaying high-contrast or interspersed bright and dark images, thereby improving the image display effect of the low-zone backlight display device.

[0008] In some embodiments, a brightness adjustment method for a low-zone backlight display device includes: dividing the input image of the current frame into multiple corresponding logical regions according to the physical backlight zone layout of the display device; extracting the original brightness features of each logical region and the global brightness features of the entire frame input image; calculating the initial target brightness value of each logical region based on the original brightness features, global brightness features, and content-aware weights corresponding to each logical region; performing spatial domain smoothing and temporal domain smoothing on each initial target brightness value in sequence to determine the backlight driving value of each logical region, and controlling the luminous brightness of the corresponding physical backlight zone according to each backlight driving value.

[0009] Optionally, the original brightness features include the average brightness value of each logical region; the global brightness features include the global average brightness value and the global peak brightness value of the entire frame of input image; based on the original brightness features of each logical region, the global brightness features, and the content-aware weights corresponding to each logical region, the initial target brightness value of each logical region is calculated, including: calculating the intermediate brightness value through a contrast stretching mapping function based on the average brightness value of the logical region, the global average brightness value, and the global peak brightness value; and calculating the initial target brightness value based on the intermediate brightness value and the content-aware weights.

[0010] Alternatively, the expression for the global contrast stretching mapping function is as follows: ; in, Let be the average brightness value of the i-th logical region. This is the global average brightness value. Where α is the global peak brightness value, and α is the preset tensile strength coefficient. This is the intermediate brightness value.

[0011] Optionally, the original brightness features also include the standard deviation used to characterize the degree of brightness change within the logical region; the content perception weight corresponding to each logical region is determined according to the following steps: the detail weight of the current logical region is determined based on the standard deviation of the current logical region; the presence of a preset subject in the current logical region is identified, and the subject weight of the current logical region is determined; the area of ​​a solid color or static background in the current logical region is identified, and the background weight of the current logical region is determined; the detail weight, subject weight, and background weight of the current logical region are combined and normalized to determine the content perception weight of the current logical region.

[0012] Optionally, the initial target brightness value is calculated based on the intermediate brightness value and content-aware weights according to the following expression: ; in, Let i be the initial target brightness value for the i-th logical region. The value is the median brightness value of the i-th logical region. Assign content-aware weights to the i-th logical region. A limiter, used to limit the amplitude of the signal. Limits from 0 to between.

[0013] Optionally, for each initial target brightness value, spatial domain smoothing and temporal domain smoothing are performed sequentially to determine the backlight driving value of each logical region, including: calculating the spatially optimized target brightness of the current logical region based on a bilateral filtering algorithm; and performing a weighted average of the spatially optimized target brightness and the backlight driving value of the current logical region in the previous frame to obtain the backlight driving value of the current logical region.

[0014] Optionally, the spatially optimized target brightness of the current logical region is calculated according to the following expression: ; in, The target brightness after spatial optimization for the i-th logical region. Let be the initial target brightness value of the j-th logical region, where j is the adjacent logical region centered at i, Ks is the spatial weight kernel based on the physical distance between logical regions, and Kr is the brightness range weight kernel based on the average brightness difference between logical regions.

[0015] Optionally, the spatially optimized target brightness and the backlight drive value of the current logical region in the previous frame are weighted and averaged according to the following expression: ; Where β is the time smoothing coefficient. Let be the backlight drive value of the current frame for the i-th logical region. This is the backlight drive value of the previous frame in the i-th logical region.

[0016] Optionally, before controlling the luminance of the corresponding physical backlight partition according to each backlight drive value, the brightness adjustment method further includes: adjusting the gain of the pixel data of the corresponding region in the input image according to the backlight drive value of each logical region.

[0017] In some embodiments, a brightness adjustment device for a low-zone backlight display device includes: a partitioning module, configured to partition the current frame input image into multiple corresponding logical regions according to the physical backlight partition layout of the display device; an extraction module, configured to extract the original brightness features of each logical region and the global brightness features of the entire frame input image; a calculation module, configured to calculate the initial target brightness value of each logical region based on the original brightness features, the global brightness features, and the content-aware weight corresponding to each logical region; and a control module, configured to sequentially perform spatial domain smoothing and temporal domain smoothing on each initial target brightness value to determine the backlight driving value of each logical region, and control the luminous brightness of the corresponding physical backlight partition according to each backlight driving value.

[0018] In some embodiments, a brightness adjustment apparatus for a low-zone backlight display device includes a processor and a memory storing program instructions, the processor being configured to execute the brightness adjustment method for a low-zone backlight display device as described above when running the program instructions.

[0019] In some embodiments, the display device includes: a device body; and a brightness adjustment device for a low-zone backlight display device as described above, disposed on the device body.

[0020] The brightness adjustment method, apparatus, and display device for low-zone backlight display devices provided in this disclosure can achieve the following technical effects: In this embodiment, when displaying an image through a display device, after dividing the input image of the current frame into multiple corresponding logical regions according to the physical backlight partitioning layout of the display device, the original brightness features of each logical region and the global brightness features of the entire frame input image are extracted first. Then, based on the original brightness features, global brightness features, and content-aware weights corresponding to each logical region, the initial target brightness value of each logical region is calculated. Higher weights can be assigned to important information areas within each logical region to ensure that small bright spots or textures in dark scenes receive sufficient backlight support, avoiding halo effects and loss of dark scene details. After determining the initial target brightness value, spatial domain smoothing and temporal domain smoothing are performed sequentially on the initial target brightness value before using it as the backlight driving value for that logical region. This softens the boundaries of brightness abrupt changes, making the backlight transition between the current frame input image and the previous frame input image natural and avoiding abrupt brightness jumps. Therefore, the embodiments disclosed herein can reduce the risk of problems such as halo, abrupt brightness jumps, and loss of dark field details when low-zone backlight display devices display high-contrast or mixed bright and dark images, thereby improving the image display effect of low-zone backlight display devices.

[0021] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0022] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein: Figure 1 This is a schematic diagram of a display device provided in an embodiment of this disclosure; Figure 2 This is a schematic diagram of a brightness adjustment method for a low-zone backlight display device provided in an embodiment of this disclosure; Figure 3 This is a flowchart illustrating the process of determining the content-aware weight corresponding to a logical region, as provided in an embodiment of this disclosure. Figure 4 This is a schematic diagram of another brightness adjustment method for a low-zone backlight display device provided in an embodiment of this disclosure; Figure 5 This is a schematic diagram of a brightness adjustment device for a low-zone backlight display device provided in an embodiment of the present disclosure; Figure 6 This is a schematic diagram of another brightness adjustment device for a low-zone backlight display device provided in an embodiment of this disclosure. Detailed Implementation

[0023] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0024] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0025] Unless otherwise stated, the term "multiple" means two or more features.

[0026] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, the A / B feature means: A or B.

[0027] The term "and / or" describes an association between objects, and the feature indicates that there can be three relationships. For example, A and / or B, the feature indicates three relationships: A or B, or A and B.

[0028] The term "correspondence" can refer to an association or binding relationship. The correspondence between A and B means that there is an association or binding relationship between A and B.

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0030] Combination Figure 1 As shown, this embodiment of the present disclosure provides a display device 100, including: a device body 110 and a brightness adjustment device 500 (600) for a low-zone backlight display device. The brightness adjustment device 500 (600) for the low-zone backlight display device is disposed on the device body.

[0031] Optionally, the display device 100 is a device that uses local dimming backlight control technology to display content, such as a smart TV or a conference computer.

[0032] Understandably, the brightness adjustment device 500 (600) for low-zone backlight display devices is communicatively connected to each independent backlight control unit in the display device.

[0033] Optionally, the brightness adjustment device 600 for a low-zone backlight display device includes a processor. During image display, the processor can divide the input image of the current frame into multiple corresponding logical regions according to the physical backlight zone layout of the display device, and extract the original brightness features of each logical region, as well as the global brightness features of the entire frame of input image. Based on the original brightness features of each logical region, the global brightness features, and the content-aware weight corresponding to each logical region, an initial target brightness value for each logical region can be calculated. Spatial domain smoothing and temporal domain smoothing are then performed sequentially on each initial target brightness value to determine the backlight drive value for each logical region. After determining the backlight drive value, the luminous brightness of the corresponding physical backlight zone can be controlled according to each backlight drive value.

[0034] In conjunction with the aforementioned display devices, this disclosure provides a brightness adjustment method for a low-zone backlight display device, wherein the execution entity of this brightness adjustment method can be the aforementioned processor. Figure 2 As shown, the brightness adjustment method includes: S201, the processor divides the input image of the current frame into multiple corresponding logical regions according to the physical backlight partition layout of the display device.

[0035] Specifically, the backlight of the display device is divided into multiple independent physical backlight zones. Each physical backlight zone has an independent backlight control unit, capable of adjusting the brightness of that zone individually. For example, a 55-inch LCD TV might have its backlight divided into 16, 32, or more physical backlight zones, arranged in a matrix on the screen. Therefore, to ensure that the brightness adjustment of the input image for the current frame matches the physical backlight zones of the display device, the input image for the current frame needs to be divided into multiple logical regions corresponding one-to-one with the physical zones, based on the layout of the physical backlight zones. For example, if the physical backlight zones are arranged in a 4×4 matrix, the input image will also be divided into 16 logical regions of 4×4.

[0036] S202, the processor extracts the original brightness features of each logical region, as well as the global brightness features of the entire frame of the input image.

[0037] Specifically, for each logical region, the brightness information of the pixels within that logical region can be analyzed to extract features that represent the brightness of that logical region, which can then be used as the original brightness features.

[0038] Optionally, the average brightness value of all pixels in the logical region can be calculated (e.g., grayscale value based on the Y component of the YCbCr color space or RGB conversion), and the brightness distribution characteristics of the logical region can be calculated, including the brightness histogram, peak brightness, and brightness standard deviation as the original brightness characteristics of the logical region.

[0039] Specifically, by analyzing the brightness information of pixels within the entire input image frame, features that represent the brightness of the entire input image frame can be extracted and used as global brightness features.

[0040] Optionally, the average brightness and peak brightness of the entire input image frame can be calculated as global brightness features.

[0041] S203, the processor calculates the initial target brightness value of each logical region based on the original brightness characteristics of each logical region, the global brightness characteristics, and the content-aware weight corresponding to each logical region.

[0042] Specifically, content-aware weight is a coefficient assigned based on the importance and characteristics of the image content within each logical region. Different image content has different sensitivities and requirements for brightness. For example, the human eye is more sensitive to details such as faces and text in an image, so the content-aware weight for these areas should be set higher; while for some background areas, the content-aware weight can be relatively lower.

[0043] Alternatively, a pre-trained model can be used to identify the content-aware weights for each logical region. For example, a deep learning model can be used to analyze a large number of images to learn the relationship between different image contents and weights, thereby assigning appropriate content-aware weights to each logical region.

[0044] Specifically, when calculating the initial target brightness value for each logical region, the original brightness characteristics of each logical region, the global brightness characteristics, and the content-aware weight corresponding to each logical region are all taken into account. This not only considers the brightness of the logical region itself, but also takes into account the global brightness balance of the entire frame image, and also makes adjustments according to the importance of the image content. This helps to improve the accuracy of the determined initial target brightness.

[0045] Optionally, the original brightness features include the average brightness value of each logical region; the global brightness features include the global average brightness value and the global peak brightness value of the entire frame of input image; based on the original brightness features of each logical region, the global brightness features, and the content-aware weights corresponding to each logical region, the initial target brightness value of each logical region is calculated, including: calculating the intermediate brightness value through a contrast stretching mapping function based on the average brightness value of the logical region, the global average brightness value, and the global peak brightness value; and calculating the initial target brightness value based on the intermediate brightness value and the content-aware weights.

[0046] Alternatively, the expression for the global contrast stretching mapping function is as follows: ; in, Let be the average brightness value of the i-th logical region. This is the global average brightness value. Where α is the global peak brightness value, and α is the preset tensile strength coefficient. This is the intermediate brightness value.

[0047] Optionally, the initial target brightness value is calculated based on the intermediate brightness value and content-aware weights according to the following expression: ; in, Let i be the initial target brightness value for the i-th logical region. The value is the median brightness value of the i-th logical region. Assign content-aware weights to the i-th logical region. A limiter, used to limit the amplitude of the signal. Limits from 0 to between.

[0048] Specifically, by using a limiter when calculating the initial target brightness value, the calculated initial target brightness value can be limited to the effective brightness range.

[0049] S204, the processor performs spatial domain smoothing and temporal domain smoothing on each initial target brightness value in sequence, determines the backlight drive value of each logical region, and controls the luminous brightness of the corresponding physical backlight partition according to each backlight drive value.

[0050] Specifically, the purpose of spatial domain smoothing is to eliminate abrupt changes in the initial target brightness values ​​between adjacent logical regions, making the brightness transition more natural, avoiding obvious brightness boundaries, and thus improving the visual quality of the image.

[0051] Optionally, spatial domain smoothing can be performed on each initial target brightness value using methods such as Gaussian filtering or mean filtering.

[0052] Specifically, temporal smoothing is mainly for consecutive frame images (i.e. video images). In order to make the brightness changes between adjacent input frames smoother and avoid flickering, the brightness values ​​of each logical region need to be smoothed on the time axis.

[0053] Alternatively, recursive filtering can be used for time-domain smoothing.

[0054] Specifically, after spatial and temporal smoothing, the final brightness value of each logical region is obtained, which is the backlight drive value of each logical region.

[0055] Optionally, for each initial target brightness value, spatial domain smoothing and temporal domain smoothing are performed sequentially to determine the backlight driving value of each logical region, including: calculating the spatially optimized target brightness of the current logical region based on a bilateral filtering algorithm; and performing a weighted average of the spatially optimized target brightness and the backlight driving value of the current logical region in the previous frame to obtain the backlight driving value of the current logical region.

[0056] Optionally, the spatially optimized target brightness of the current logical region is calculated according to the following expression: ; in, The target brightness after spatial optimization for the i-th logical region. Let be the initial target brightness value of the j-th logical region, where j is the adjacent logical region centered at i, Ks is the spatial weight kernel based on the physical distance between logical regions, and Kr is the brightness range weight kernel based on the average brightness difference between logical regions.

[0057] Optionally, the spatially optimized target brightness and the backlight drive value of the current logical region in the previous frame are weighted and averaged according to the following expression: ; Where β is the time smoothing coefficient. Let be the backlight drive value of the current frame for the i-th logical region. This is the backlight drive value of the previous frame in the i-th logical region.

[0058] Optionally, 0.7 < <0.95, when the overall motion vector of the input image is large, decrease β to make the backlight response faster and avoid ghosting; increase β when the input image is a static image to ensure absolute brightness stability.

[0059] In this embodiment, when displaying an image through a display device, after dividing the input image of the current frame into multiple corresponding logical regions according to the physical backlight partitioning layout of the display device, the original brightness features of each logical region and the global brightness features of the entire frame input image are extracted first. Then, based on the original brightness features, global brightness features, and content-aware weights corresponding to each logical region, the initial target brightness value of each logical region is calculated. Higher weights can be assigned to important information areas within each logical region to ensure that small bright spots or textures in dark scenes receive sufficient backlight support, avoiding halo effects and loss of dark scene details. After determining the initial target brightness value, spatial domain smoothing and temporal domain smoothing are performed sequentially on the initial target brightness value before using it as the backlight driving value for that logical region. This softens the boundaries of brightness abrupt changes, making the backlight transition between the current frame input image and the previous frame input image natural and avoiding abrupt brightness jumps. Therefore, the embodiments disclosed herein can reduce the risk of problems such as halo, abrupt brightness jumps, and loss of dark field details when low-zone backlight display devices display high-contrast or mixed bright and dark images, thereby improving the image display effect of low-zone backlight display devices.

[0060] In some embodiments, the raw brightness feature also includes a standard deviation characterizing the degree of brightness variation within a logical region. Figure 3 As shown, the steps for determining the content-aware weight corresponding to each logical region include: S301, the processor determines the detail weight of the current logical region based on the standard deviation of the current logical region.

[0061] Specifically, for pixel brightness values ​​within a logical region, the standard deviation reflects the degree of brightness variation within that region. A larger standard deviation indicates greater differences between pixel brightness values ​​within the logical region, meaning there are more abrupt brightness changes, potentially containing rich detail information such as object edges and textures. Conversely, a smaller standard deviation indicates that pixel brightness values ​​within the region are relatively similar, with relatively gentle brightness variations and less detail information.

[0062] Specifically, multiple standard deviation thresholds are pre-set, and the detail weight is determined based on the comparison between the standard deviation of the current logical region and these standard deviation thresholds. For example, three thresholds T1, T2, and T3 (T1 < T2 < T3) are set. When the standard deviation is less than or equal to T1, it indicates that the brightness change of the current logical region is very gradual, and the detail weight can be set to a small value W1; when the standard deviation is between T1 and T2, the detail weight is set to W2 (W2 > W1); when the standard deviation is between T2 and T3, the detail weight is set to W3 (W3 > W2); when the standard deviation is greater than T3, it indicates that the brightness change of the current logical region is drastic and the detail is rich, and the detail weight needs to be set to a larger value W4 (W4 > W3).

[0063] S302, the processor identifies that there is a preset subject in the current logical region and determines the subject weight of the current logical region.

[0064] Optionally, the preset subjects include human faces, text, specific logos, etc.

[0065] Specifically, if there are a large number of preset subjects in the current logical area, it indicates that this logical area requires higher display brightness and a higher weight. Therefore, the subject weight of the current logical area can be determined by the presence of preset subjects.

[0066] S303, the processor identifies the area of ​​the solid color or static background of the current logical region and determines the background weight of the current logical region.

[0067] Specifically, a solid color background refers to a region within a logical area where the pixel color is basically the same. Whether a region is solid color can be determined by calculating the variance or standard deviation of the pixel colors within that region. If the variance or standard deviation is less than a very small threshold, the region can be considered a solid color background. A static background refers to a relatively still region in a video sequence. Static backgrounds can be identified by comparing the pixel changes in corresponding logical areas in adjacent frames. For example, the average of the absolute differences between pixels within corresponding logical areas in two adjacent frames can be calculated. If this average is less than a threshold, the region is considered a static background.

[0068] Specifically, the higher the proportion of solid color or static background area in the current logical region, the lower the required display brightness and the lower the required weight for this logical region. Therefore, the solid color or static background area of ​​the current logical region can be identified to determine the background weight of the current logical region.

[0069] S304, the processor integrates the detail weight, topic weight, and background weight of the current logical region and performs normalization processing to determine the content-aware weight of the current logical region.

[0070] Specifically, the method for combining the detail weight, topic weight, and background weight of the current logical region can be either to select the maximum value among them, or to perform a weighted summation of the detail weight, topic weight, and background weight.

[0071] Optionally, the normalization interval is [0.5, 1.5].

[0072] In this embodiment, the content-aware weight of a logical region is determined by taking into account the detail weight, topic weight, and background weight of that logical region. This helps to improve the accuracy of the determined content-aware weight.

[0073] This disclosure provides another method for brightness adjustment in low-zone backlight display devices, such as... Figure 4 As shown, the brightness adjustment method includes: S401, the processor divides the input image of the current frame into multiple corresponding logical regions according to the physical backlight partition layout of the display device.

[0074] S402, the processor extracts the raw brightness features of each logical region, as well as the global brightness features of the entire input image frame.

[0075] S403, the processor calculates the initial target brightness value for each logical region based on the original brightness characteristics of each logical region, the global brightness characteristics, and the content-aware weight corresponding to each logical region.

[0076] S404, the processor performs spatial domain smoothing and temporal domain smoothing on each initial target brightness value to determine the backlight drive value for each logical region.

[0077] S405, the processor adjusts the gain of the pixel data of the corresponding region in the input image according to the backlight drive value of each logical region.

[0078] Specifically, in low-spot backlight display devices, due to the limited number of backlight zones and the relatively large area controlled by each zone, directly controlling the backlight brightness according to the backlight drive value may result in areas of the image being too dark or too bright, leading to uneven brightness and loss of detail. Adjusting the gain of the pixel data in the corresponding areas of the input image can compensate for the shortcomings of backlight adjustment, optimize the brightness distribution of the image, enhance image detail and contrast, and thus improve the overall visual effect.

[0079] Optionally, for each pixel, a gain coefficient is calculated based on the ratio of the backlight driving value to the reference driving value of its logical region. Specifically, the lower the backlight driving value (the darker the backlight), the greater the gain of the corresponding pixel data. After calculating the gain coefficient, for each pixel in the corresponding logical region of the input image, its pixel value is multiplied by the corresponding gain coefficient for gain adjustment.

[0080] S406, the processor controls the luminous brightness of the corresponding physical backlight zone according to each backlight drive value.

[0081] In this embodiment, before controlling the luminance of the corresponding physical backlight zone according to each backlight drive value, the pixel data of the corresponding region in the input image is also adjusted according to the backlight drive value of each logical region. This helps to further improve the image display effect.

[0082] Combination Figure 5 As shown in the figure, this disclosure provides a brightness adjustment device 500 for a low-zone backlight display device, including: a partitioning module 501, an extraction module 502, a calculation module 503, and a control module 504. The partitioning module 501 is used to divide the current frame input image into multiple corresponding logical regions according to the physical backlight partition layout of the display device. The extraction module 502 is used to extract the original brightness features of each logical region and the global brightness features of the entire frame input image. The calculation module 503 is used to calculate the initial target brightness value of each logical region based on the original brightness features of each logical region, the global brightness features, and the content-aware weight corresponding to each logical region. The control module 504 is used to sequentially perform spatial domain smoothing and temporal domain smoothing processing on each initial target brightness value to determine the backlight driving value of each logical region, and control the luminous brightness of the corresponding physical backlight partition according to each backlight driving value.

[0083] Combination Figure 6 As shown, this disclosure provides a brightness adjustment device 600 for a low-zone backlight display device, including a processor 601 and a memory 602. Optionally, the device may further include a communication interface 603 and a bus 604. The processor 601, communication interface 603, and memory 602 can communicate with each other via the bus 604. The communication interface 603 can be used for information transmission. The processor 601 can call logical instructions in the memory 602 to execute the brightness adjustment method for a low-zone backlight display device described in the above embodiment.

[0084] Furthermore, the logic instructions in the aforementioned memory 602 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0085] The memory 602, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of this disclosure. The processor 601 executes functional applications and data processing by running the program instructions / modules stored in the memory 602, that is, it implements the brightness adjustment method for the low-zone backlight display device in the above embodiments.

[0086] The memory 602 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory 602 may include high-speed random access memory and may also include non-volatile memory.

[0087] This disclosure provides a computer-readable storage medium storing computer-executable instructions configured to perform the above-described brightness adjustment method for a low-zone backlight display device.

[0088] The technical solutions of this disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in this disclosure. The aforementioned storage medium can be a non-transitory storage medium, such as a USB flash drive, external hard drive, read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk, etc., and other media capable of storing program code.

[0089] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0090] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0091] The methods and products disclosed in the embodiments herein (including but not limited to devices and equipment) can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may be merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to implement this embodiment according to actual needs. In addition, the functional units in the embodiments of this disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0092] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

Claims

1. A brightness adjustment method for a low-zone backlight display device, characterized in that, include: Based on the physical backlight partition layout of the display device, the input image of the current frame is divided into multiple corresponding logical regions; Extract the original brightness features of each logical region, as well as the global brightness features of the entire input image frame; Based on the original brightness characteristics of each logical region, the global brightness characteristics, and the content-aware weight corresponding to each logical region, calculate the initial target brightness value of each logical region; For each initial target brightness value, spatial domain smoothing and temporal domain smoothing are performed sequentially to determine the backlight drive value for each logical region, and the luminous brightness of the corresponding physical backlight partition is controlled according to each backlight drive value.

2. The brightness adjustment method according to claim 1, characterized in that, The original brightness features include the average brightness value of each logical region; the global brightness features include the global average brightness value and the global peak brightness value of the entire input image frame; based on the original brightness features of each logical region, the global brightness features, and the content-aware weights corresponding to each logical region, the initial target brightness value of each logical region is calculated, including: The intermediate brightness value is calculated using the contrast stretching mapping function based on the average brightness value of the logical region, the global average brightness value, and the global peak brightness value. The initial target brightness value is calculated based on the intermediate brightness value and the content-aware weight.

3. The brightness adjustment method according to claim 2, characterized in that, The expression for the global contrast stretching mapping function is as follows: ； in, Let be the average brightness value of the i-th logical region. This is the global average brightness value. Where α is the global peak brightness value, and α is the preset tensile strength coefficient. This is the intermediate brightness value.

4. The brightness adjustment method according to claim 2, characterized in that, The raw brightness features also include the standard deviation, which characterizes the degree of brightness variation within a logical region; the content-aware weights for each logical region are determined according to the following steps: Determine the detail weights of the current logical region based on the standard deviation of the current logical region; Identify the presence of a preset subject in the current logical region and determine the subject weight of the current logical region; Identify the area of ​​the solid color or static background of the current logical region and determine the background weight of the current logical region; The content perception weight of the current logical region is determined by combining the detail weight, topic weight, and background weight of the current logical region and performing normalization processing.

5. The brightness adjustment method according to claim 2, characterized in that, The initial target brightness value is calculated based on the intermediate brightness value and content-aware weights, using the following expression: ； in, Let i be the initial target brightness value for the i-th logical region. The value is the median brightness value of the i-th logical region. Assign content-aware weights to the i-th logical region. A limiter, used to limit the amplitude of the signal. Limits from 0 to between.

6. The brightness adjustment method according to claim 1, characterized in that, For each initial target brightness value, spatial domain smoothing and temporal domain smoothing are performed sequentially to determine the backlight drive value for each logical region, including: The algorithm is based on bilateral filtering to calculate the spatially optimized target brightness of the current logical region. The backlight drive value of the current logical region is obtained by weighted averaging the spatially optimized target brightness and the backlight drive value of the current logical region in the previous frame.

7. The brightness adjustment method according to any one of claims 1 to 6, characterized in that, Before controlling the luminous brightness of the corresponding physical backlight zone according to each backlight drive value, the brightness adjustment method also includes: Gain adjustment is performed on the pixel data of the corresponding region in the input image based on the backlight drive value of each logical region.

8. A brightness adjustment device for a low-zone backlight display device, characterized in that, include: The partitioning module is used to divide the current frame input image into multiple corresponding logical regions according to the physical backlight partitioning layout of the display device; The extraction module is used to extract the original brightness features of each logical region, as well as the global brightness features of the entire input image frame; The calculation module is used to calculate the initial target brightness value of each logical region based on the original brightness characteristics of each logical region, the global brightness characteristics, and the content-aware weight corresponding to each logical region. The control module is used to perform spatial domain smoothing and temporal domain smoothing on each initial target brightness value, determine the backlight drive value of each logical region, and control the luminous brightness of the corresponding physical backlight partition according to each backlight drive value.

9. A brightness adjustment device for a low-zone backlight display device, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to, when running the program instructions, execute the brightness adjustment method for a low-zone backlight display device as described in any one of claims 1 to 7.

10. A display device, characterized in that, include: Equipment body; The brightness adjustment device for a low-zone backlight display device as described in claim 8 or 9 is disposed on the device body.

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