Method, device, system and medium for evaluating pixel saturation of LED display screen

Abstract

The present application relates to a method, device, system, and medium for evaluating the pixel saturation of an LED display screen. The method utilizes pixel fill rate to characterize the pixel saturation of an LED display screen, enabling accurate and objective quantification of the pixel saturation of the LED display screen. The method includes: obtaining a display image of a single primary color of an LED display screen captured by an optical imaging device; dividing the display image into a plurality of unit blocks at equal intervals, each unit block having an equal total number of pixels; retrieving the brightness values ​​of the pixels in the unit blocks, and counting the number of pixels having a brightness value greater than or equal to a preset brightness threshold, wherein the preset brightness threshold is a preset multiple of the maximum brightness value of the pixels in the unit block; and calculating the pixel fill rate of the LED display screen based on the ratio of the number of pixels to the total number of pixels.

Description

Technical Field

[0001] The present application belongs to the technical field of LED display screens, and in particular relates to a method, device, system, and medium for evaluating pixel saturation of an LED display screen. Background Art

[0002] LED displays feature high brightness, vivid colors, high luminous efficiency, high contrast, short response time, a wide operating temperature range, and low energy consumption. They are widely used in stage displays, advertising displays, data visualization displays, and commercial displays. Structurally, LED displays are constructed from several independent LED lamps connected via PCB circuits to form an LED display panel. Multiple display panels are then assembled into independent cabinets, and finally, multiple independent cabinets are assembled to form a complete screen. This unique structure enables LED displays to be flexibly applied in a variety of scenarios, while maintaining the significant advantage of high display integrity.

[0003] However, while this advantage comes with other negative issues, such as moiré patterns when recording content displayed on the screen. The pixel saturation of the LED display is a key factor affecting this problem. The higher the pixel saturation of the LED display, the less moiré the image will experience. However, excessive pixel saturation can also reduce image sharpness and impair visual quality. Therefore, to address the moiré problem without compromising image quality, it is necessary to rationally design the pixel saturation of the LED display. The first step in evaluating the pixel saturation of an LED display is to objectively quantify it. However, there is currently no method for objectively quantifying the pixel saturation of an LED display. Summary of the Invention

[0004] In view of this, the embodiments of the present application provide a method, device, system and medium for evaluating the pixel saturation of an LED display screen to solve the problem in the prior art that the pixel saturation of an LED display screen cannot be objectively quantified.

[0005] A first aspect of an embodiment of the present application provides a method for evaluating the pixel saturation of an LED display screen, comprising: obtaining a display image of a single primary color of the LED display screen captured by an optical imaging device; dividing the display image into multiple unit blocks at equal intervals, with the total number of pixels in each unit block being equal; retrieving the brightness values ​​of the pixels in the unit blocks, and counting the number of pixels whose brightness values ​​are greater than or equal to a preset brightness threshold, where the preset brightness threshold is a preset multiple of the maximum brightness value of the pixels in the unit blocks; and calculating the pixel fill rate of the LED display screen based on the ratio of the number of pixels to the total number of pixels.

[0006] In combination with the first aspect, in a first possible implementation of the first aspect, the counting of the number of pixels whose brightness values ​​are greater than or equal to a preset brightness threshold includes: assigning the grayscale value of the pixels whose brightness values ​​are greater than or equal to the preset brightness threshold to the highest grayscale value corresponding to the pixel with the maximum brightness value in the unit block; and counting the number of pixels with the highest grayscale value in the unit block.

[0007] In combination with the first aspect, in a second possible implementation of the first aspect, the pixel fill rate of the LED display is calculated based on the proportion of the number of pixels to the total number of pixels, including: calculating the pixel fill rate of each of the unit blocks and the average pixel fill rate of all the unit blocks based on the proportion of the number of pixels to the total number of pixels; eliminating the pixel fill rates of the unit blocks that are greater than a preset fill threshold, and retaining the pixel fill rates of the unit blocks that are less than or equal to the preset fill threshold, where the preset fill threshold is a preset multiple of the average pixel fill rate; and calculating the average value of the pixel fill rates of the retained unit blocks to obtain the pixel fill rate of the LED display.

[0008] In combination with the first aspect, in a third possible implementation of the first aspect, when the optical imaging device captures a display image of a single primary color of the LED display screen, the difference between the light intensity received by the optical imaging device and the light intensity emitted from the front of the LED display screen is less than 5%.

[0009] In combination with the first aspect, in a fourth possible implementation of the first aspect, when the optical imaging device captures a display image of a single primary color of an LED display screen, a distance x between the optical imaging device and the LED display screen satisfies the following formula:

[0010]

[0011] h is the height of the LED display screen, is the angle between the optical axis of the optical imaging device and the highest point of the LED display screen, and

[0012] In combination with the first aspect, in a fifth possible implementation of the first aspect, after calculating the pixel fill rate of the LED display based on the ratio of the number of pixels to the total number of pixels, it also includes: judging whether the pixel fill rate is greater than or equal to 70% and less than or equal to 80% to evaluate whether the pixel saturation of the LED display is qualified.

[0013] A second aspect of an embodiment of the present application provides an evaluation device for pixel saturation of an LED display screen, comprising an image acquisition module, an FPGA processing module, and a DSP processing module, wherein the FPGA processing module is connected to the image acquisition module and the DSP processing module, respectively; the image acquisition module is used to acquire a display image of a single primary color imaging of an LED display screen by an optical imaging device, and transmit the display image to the FPGA processing module; the FPGA processing module is used to divide the display image into multiple unit blocks at equal intervals, and transmit the unit blocks to the DSP processing module, wherein the total number of pixels in each unit block is equal; the DSP processing module is used to retrieve the brightness values ​​of the pixels in the unit blocks, and count the number of pixels whose brightness values ​​are greater than or equal to a preset brightness threshold, wherein the preset brightness threshold is a preset multiple of the maximum brightness value of the pixels in the unit block, and the pixel fill rate of the LED display screen is calculated based on the ratio of the number of pixels to the total number of pixels.

[0014] In combination with the second aspect, in a first possible implementation of the second aspect, the FPGA processing module is further used to evaluate whether the pixel saturation of the LED display screen is qualified based on the pixel fill rate.

[0015] A third aspect of an embodiment of the present application provides an evaluation system, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the method described in any one of the first aspects are implemented.

[0016] A fourth aspect of an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method described in any one of the first aspects are implemented.

[0017] Compared with the prior art, the embodiments of the present application have the following beneficial effects: by dividing the display image of a single primary color of an LED display screen into unit blocks, retrieving brightness values, and counting the number of pixels, the pixel fill rate of the LED display screen is calculated, and the pixel fill rate is used to characterize the pixel saturation of the LED display screen, so that the pixel saturation of the LED display screen can be accurately and objectively quantified; the pixel fill rate after quantification of the pixel saturation of the LED display screen is then compared with the qualified standard, and the pixel saturation of the LED display screen is reasonably evaluated, so that an LED display screen can be produced that can alleviate the moiré effect of screen camera imaging without reducing the sharpness of the picture display. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1 This is a schematic diagram of an implementation flow of a method for evaluating pixel saturation of an LED display screen provided in an embodiment of the present application;

[0020] Figure 2 This is a light intensity distribution diagram of the green primary color of the LED display provided in an embodiment of the present application;

[0021] Figure 3 It is a partial view of a display image provided by an embodiment of the present application;

[0022] Figure 4 is a schematic diagram of dividing a display image into multiple unit blocks provided by an embodiment of the present application;

[0023] Figure 5 Schematic diagram of the Y value of each pixel in the display image provided by the embodiment of the present application;

[0024] Figure 6 This is a schematic diagram of assigning values ​​to each pixel provided in an embodiment of the present application;

[0025] Figure 7 This is a schematic diagram of a device for evaluating pixel saturation of an LED display screen provided in an embodiment of the present application.

[0026] Figure 8 Schematic diagram of an evaluation system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0027] In the following description, specific details such as specific system structures and techniques are provided for purposes of illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obscuring the description of the present application with unnecessary detail.

[0028] In order to illustrate the technical solution described in this application, specific embodiments are provided below.

[0029] When photographing an LED display, the pixel saturation of the LED display will affect the appearance of moiré patterns in the captured image. The pixel saturation of the LED display is mainly affected by the light output angle of the LED display's smallest light-emitting unit. The smaller the light output angle, the worse the pixel saturation of the LED display, the higher the spatial frequency of the displayed image, and the more serious the moiré pattern problem in the captured image. The larger the light output angle, the higher the pixel saturation of the LED display, the lower the spatial frequency of the displayed image, and the milder the moiré pattern problem in the captured image. However, excessive pixel saturation will also reduce image sharpness and impair the visual effect of the image. Therefore, in order to solve the moiré pattern problem that occurs when shooting without reducing image quality, it is necessary to reasonably design the pixel saturation of the LED display. Only when the pixel saturation of the designed LED display meets the qualified standard can it be guaranteed that neither moiré pattern problems nor image quality degradation will occur.

[0030] Therefore, in the design and development process of LED display screens, it is necessary to evaluate whether the pixel saturation of the LED display screen meets the qualified standards. At present, the industry evaluates the pixel saturation of LED display screens by using the human eye visual observation method. The visual characteristics of the human eye are different. The subjective observation results of different observers will lead to different evaluation results of the pixel saturation of the LED display screen, which lacks professionalism and reliability.

[0031] Based on the problems existing in the prior art, the embodiments of the present application propose a method, device, system and medium for evaluating the pixel saturation of an LED display screen. By processing the display image of the captured LED display screen, the pixel fill rate of the LED display screen is calculated, and the pixel fill rate is used to characterize the pixel saturation of the LED display screen, which can accurately and objectively quantify the pixel saturation of the LED display screen; then, the pixel fill rate is compared with the qualified standard to reasonably evaluate the pixel saturation of the LED display screen, and produce an LED display screen that can alleviate the moiré effect of screen camera imaging without reducing the sharpness of the picture display.

[0032] like Figure 1 As shown, a first aspect of an embodiment of the present application provides a method for evaluating pixel saturation of an LED display screen, comprising the following steps:

[0033] S101, obtaining a display image of a single primary color of an LED display screen captured by an optical imaging device;

[0034] An optical imaging device is used to capture and image the display screen of the LED display screen. The optical imaging device can be an XYZ filter camera, a SLR camera, etc., and the lens adopts a non-wide-angle zoom lens. For example, the embodiment of the present application can adopt an XYZ filter camera. Since the embodiment of the present application mainly uses the brightness value of light for calculation, it is only necessary to use the Y filter of the XYZ filter camera for shooting. The XYZ filter camera simulates the response of the human eye to light by selecting three filters X, Y, and Z, thereby directly obtaining the XYZ tristimulus values ​​of the captured image. The XYZ tristimulus values ​​are calculated using the color matching functions of three standard observers. The standard 1931 CIE system defines standard observers that conform to the color matching functions x(λ), y(λ), and z(λ).

[0035] An LED display screen refers to an LED display screen composed of multiple LED light sources. This embodiment of the present application does not restrict the type of LED display screen, including all known displays, such as monochrome and color. The display screen of the LED display screen participating in the pixel saturation evaluation is also not restricted, and can be any screen when the LED display screen is illuminated. It should be noted that when the image of the LED display screen participating in the pixel saturation evaluation has multiple primary colors, the evaluation should be performed on a single primary color, and no other primary colors within the single primary color should be dimmed or brightened to avoid interference with the evaluation results.

[0036] For example, the LED display screen of the embodiment of the present application can adopt a COB (chip on board packaging process) display module with a size of 170mm×150mm×60mm, which represents the length, width and height of the LED display screen. The picture of the LED display screen involved in the saturation evaluation includes three primary colors: red, green and blue. When displaying a single primary color, the other two primary colors must not be dimmed or brightened to avoid interfering with the evaluation results. In actual situations, the light intensity distribution of the three primary colors of red, green and blue needs to be considered. The embodiment of the present application mainly uses the green primary color for exemplary explanation. Figure 2 The following table shows the intensity distribution of green LED light source at different angles. Figure 2 It is understandable that the light intensity distribution shown is different.

[0037] As a preferred implementation of the embodiment of the present application, when the optical imaging device captures a display image of a single primary color of an LED display screen, the difference between the light intensity received by the optical imaging device and the light intensity emitted from the front of the LED display screen is less than 5%.

[0038] When the optical imaging device captures an image of an LED display screen, the optical axis of the optical imaging device receives light intensities emitted by multiple LED light sources. Because there are multiple LED light sources distributed at different positions on the LED display screen, there is a certain angle between the optical axis of the optical imaging device and the line connecting the light emitted by the LED light sources, which makes the optical imaging device receive different light intensities from the LED light sources distributed at different positions. Therefore, when capturing images, it is necessary to ensure that the difference between the light intensity received at the optical axis of the optical imaging device and the light intensity emitted from the front of the LED light source is less than 5%.

[0039] As a preferred implementation of the embodiment of the present application, when the optical imaging device captures a display image of a single primary color of an LED display screen, the distance x between the optical imaging device and the LED display screen satisfies the following formula:

[0040]

[0041] Wherein, h is the height of the LED display screen, is the angle between the optical axis of the optical imaging device and the highest point of the LED display screen, and

[0042] In order to reduce the interference of the light intensity direction of the LED light source on the LED display screen on the shooting of the optical imaging device, the embodiment of the present application puts forward requirements for the relative position between the optical imaging device and the LED display screen, which needs to be set with reference to the light intensity distribution of the LED light source on the LED display screen. Specifically, it is the angle between the optical axis of the optical imaging device lens and the highest point of the LED display screen. Needs to be less than 2°.

[0043] Since the present application requires the control of the distance between the optical imaging device and the LED display, the LED display is provided with a displacement device. The displacement device can be a mechanical or non-mechanical precision positioning device such as a rotating platform or a movable slide rail, which is used to support the position control and coaxial rotation requirements of the LED display required by the present application. For example, the displacement device can be a mechanical positioning device that can accurately control the relative distance between the LED display and the XYZ filter camera. According to the size data of the LED display and the formula tan It can be seen that in order to ensure the angle between the optical axis of the XYZ filter camera lens and the highest point of the LED display Less than 2°, the distance that the displacement device controls the movement of the LED display needs to satisfy the vertical distance x between the LED display and the XYZ filter camera>860mm.

[0044] Preferably, when the optical imaging device captures an image of the LED display screen, it captures the display screen of the LED display screen in an environment where the reflected illuminance is less than 101ux, which can avoid the influence of ambient light on the image captured by the LED display screen; the imaging area of ​​the display screen of the LED display screen is larger than 4 / 5 of the imaging area of ​​the photosensitive element of the optical imaging device, which can ensure that a certain number of effective pixels participating in the pixel saturation evaluation are in the displayed image; by adjusting multiple parameters such as the exposure time, aperture size, ISO sensitivity value, and focus ring of the optical imaging device, the imaging grayscale of the LED display screen is controlled within the linear working area of ​​the photosensitive element of the optical imaging device, ensuring that the photosensitive element faithfully records the received light intensity, which is closer to the photosensitivity characteristics of the human eye, and there should be obvious black and white image pixel boundaries between pixels in the displayed image, and it cannot be overexposed or undersensitive. The specific parameters of the optical imaging device need to be adaptively adjusted in combination with the comprehensive performance of the device, and the embodiments of the present application do not limit this.

[0045] S102, dividing the display image into a plurality of unit blocks at equal intervals, wherein the total number of pixels of each unit block is equal;

[0046] In step S102, in order to ensure that there are a certain number of valid pixels in a unit block, the displayed image is divided into multiple unit blocks at equal intervals, and the total number of image pixels in each unit block is equal. Figure 3 The image shown is a partial view of the green primary color LED display captured by an XYZ filter camera and converted to grayscale. For ease of understanding, the LED display screen uses uniformly distributed LED light sources for imaging. In the captured image, the LED display screen is regularly arranged in the form of light clusters. Figure 4 Shown is Figure 3 One of the ways to segment the displayed image is to divide the LED display pixel light group into multiple rectangular unit blocks of the same size with equal spacing.

[0047] S103, retrieving brightness values ​​of pixels in the unit block, and counting the number of pixels having brightness values ​​greater than or equal to a preset brightness threshold, where the preset brightness threshold is a preset multiple of the maximum brightness value of the pixels in the unit block;

[0048] In step S103, for each unit block, the pixel data of the LED display screen in the unit block is processed, for example, as shown in FIG. Figure 5 Shown is the Figure 4Figure 1 is a schematic diagram of the signal processing of the pixel data in the image. The numbers 1-5 are used to identify the brightness value of each pixel (the numbers 1-5 here are not the specific brightness values, but the degree of the brightness values). Since the optical imaging device in the embodiment of the present application specifically uses the Y filter in the XYZ filter camera to obtain the brightness value of the LED display screen, the numbers here represent the imaging Y values ​​corresponding to the pixels. The larger the number, the larger the Y value of the pixel, and the higher the grayscale value corresponding to the pixel. The pixel Y values ​​in the unit block are searched in sequence to find the pixels in the unit block whose brightness values ​​are greater than or equal to the preset brightness threshold.

[0049] Among them, the preset brightness threshold is a preset multiple of the maximum brightness value of the pixels in the current unit block, that is, the maximum Y value in the unit block × n% in the embodiment of the present application. The specific multiple can be determined based on the characteristics of the LED display screen and actual operating experience. In the embodiment of the present application, 10% can be specifically used.

[0050] For the rigor and standardization of pixel number statistics, the embodiment of the present application can also assign the Y value of the pixel whose brightness value is greater than or equal to the preset brightness threshold as the grayscale value corresponding to the pixel with the maximum Y value. As a preferred implementation method of the embodiment of the present application, the counting of the number of pixels whose brightness value is greater than or equal to the preset brightness threshold includes: assigning the grayscale value of the pixel whose brightness value is greater than or equal to the preset brightness threshold as the highest grayscale value corresponding to the pixel with the maximum brightness value in the unit block; and counting the number of pixels with the highest grayscale value in the unit block.

[0051] For example, in the actual operation of signal processing, the embodiment of the present application specifically assigns the grayscale value of the pixel whose Y value in the unit block is greater than or equal to the maximum Y value in the unit block × n% as the highest grayscale value, and assigns the grayscale value of the pixel whose Y value in the unit block is less than the maximum Y value in the unit block × n% as the lowest grayscale value, such as Figure 6 As shown, the number 0 represents the lowest grayscale value and the number 5 represents the highest grayscale value. Figure 5 The grayscale values ​​of all pixels with Y values ​​greater than or equal to 2 are assigned a value of 5, and the grayscale values ​​of all pixels with Y values ​​less than 2 are assigned a value of 0. This is more convenient and rigorous when counting the number of image pixels with the highest grayscale value in the unit block.

[0052] S104 , calculating a pixel fill rate of the LED display screen according to a ratio of the number of pixels to the total number of pixels.

[0053] As a preferred implementation of the embodiment of the present application, step S104 specifically includes the following steps:

[0054] S1041. Calculate the pixel fill rate of all unit blocks of the LED display: calculate the pixel fill rate of each unit block based on the ratio of the number of pixels to the total number of pixels, and calculate the average pixel fill rate based on the average value of the pixel fill rates of all the unit blocks;

[0055] S1042, eliminating pixel fill rates with large data differences: eliminating pixel fill rates of the unit blocks that are greater than a preset fill threshold, and retaining pixel fill rates of the unit blocks that are less than or equal to the preset fill threshold, wherein the preset fill threshold is a preset multiple of the average pixel fill rate, which is defined based on the characteristics of the LED display and actual operating experience, and can be any value greater than or equal to 30%;

[0056] S1043. Calculate the pixel filling rate of the LED display screen: calculate the average value of the pixel filling rates of the retained unit blocks to obtain the pixel filling rate of the LED display screen.

[0057] In step S104, the pixel fill rate of each unit block in the LED display screen is first calculated, and the pixel fill rates of all unit blocks in the LED display screen are used as data samples for further data screening to eliminate pixel fill rates with large differences. Finally, the pixel fill rate of the LED display screen is calculated to characterize the pixel saturation of the LED display screen.

[0058] S105 , determining whether the pixel fill rate is greater than or equal to 70% and less than or equal to 80% to evaluate whether the pixel saturation of the LED display screen is qualified.

[0059] In step S105, after calculating the pixel fill rate of the LED display screen, the pixel fill rate is used to objectively quantify the pixel saturation of the LED display screen. If the pixel fill rate of the LED display screen is within the range of greater than or equal to 70% and less than or equal to 80%, the pixel saturation of the LED display screen is judged to be qualified. The LED display screen can alleviate the moiré problem that appears in the captured image without reducing the display sharpness of the captured image, and meets the production standards of LED display screens.

[0060] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0061] like Figure 7As shown, the second aspect of the embodiment of the present application provides an evaluation device for pixel saturation of an LED display screen, which uses FPGA and DSP as implementation media for image processing to process a display image of an LED display screen captured by an optical imaging device. The device mainly includes an image acquisition module 701, an FPGA processing module 702, and a DSP processing module 703;

[0062] The image acquisition module 701 is connected to the optical imaging device and is used to acquire the display image of the optical imaging device on the LED display screen with single primary color imaging, and transmit the display image signal to the FPGA processing module 702 after performing digital-to-analog conversion.

[0063] The FPGA processing module 702 is connected to the image acquisition module 701 and is used to receive the display image transmitted by the image acquisition module 701, grayscale the display image, and then divide the grayscaled display image into multiple unit blocks at equal intervals, and transmit the unit blocks to the DSP processing module 703, wherein the total number of pixels in each unit block is equal. The specific implementation process of the FPGA processing module 702 for display image segmentation can refer to the method corresponding to the first aspect of the embodiment of the present application, and will not be described in detail here. In addition, the embodiment of the present application does not limit the model of the main control chip of the FPGA processing module 702. For example, a chip with a model of XC4VSX35 can be selected; it can be understood that the FPGA processing module 702 is equipped with an MCU module (a chip with a model of STM32F103C8T6 can be selected) to complete various initial settings of the FPGA processing module 702.

[0064] The DSP processing module 703 is connected to the FPGA processing module 702 and is used to retrieve the brightness values ​​of the pixels in the unit block, and count the number of pixels whose brightness values ​​are greater than or equal to the preset brightness threshold. According to the ratio of the number of pixels to the total number of pixels, the pixel fill rate of the LED display screen is calculated, and the pixel fill rate of the LED display screen is transmitted back to the FPGA processing module 702, wherein the preset brightness threshold is a preset multiple of the maximum brightness value of the pixels in the unit block. The specific implementation process of the DSP processing module 703 calculating the pixel fill rate can refer to the method corresponding to the first aspect of the embodiment of the present application, and will not be described in detail here. In addition, the embodiment of the present application does not limit the model of the main control chip of the DSP processing module 703. For example, a chip with the model TMS320C6416 can be selected.

[0065] FPGA processing module 702 is further configured to receive the pixel fill rate of the LED display screen transmitted back by DSP processing module 703. FPGA processing module 702 includes a preset comparator capable of evaluating the pixel saturation of the LED display screen based on the pixel fill rate and outputting the evaluation result. The specific implementation of FPGA processing module 702 evaluating whether the pixel saturation of the LED display screen meets the qualified standard can be referred to the method corresponding to the first aspect of the embodiment of this application and will not be further described here.

[0066] like Figure 8 As shown, the third aspect of an embodiment of the present application provides an evaluation system, comprising a memory 81, a processor 80, and a computer program 82 stored in the memory 81 and executable on the processor 80, wherein the processor 80 implements the steps of the method as described in any one of the first aspects when executing the computer program 82.

[0067] A fourth aspect of an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method described in the first aspect are implemented.

[0068] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0069] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0070] Those skilled in the art will appreciate that the units and algorithm steps of each example 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 performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0071] In the embodiments provided in this application, it should be understood that the disclosed devices / terminal equipment and methods can be implemented in other ways. For example, the device / terminal equipment embodiments described above are merely illustrative. For example, the division of the modules or units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0072] The units described as separate components may or may not be physically separate, and 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 these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0073] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0074] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the process in the above-mentioned embodiment method, and can also be completed by hardware related to computer program instructions. The computer program can be stored in a computer-readable storage medium, and when the computer program is executed by the processor, it can implement the steps of the above-mentioned various method embodiments. Wherein, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0075] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A method for evaluating pixel saturation of an LED display, characterized in that: include: Obtain a display image of a single primary color of an LED display screen captured by an optical imaging device; Dividing the display image into a plurality of unit blocks at equal intervals, wherein the total number of pixels of each unit block is equal; Retrieving brightness values ​​of pixels in the unit block, and counting the number of pixels whose brightness values ​​are greater than or equal to a preset brightness threshold, where the preset brightness threshold is a preset multiple of the maximum brightness value of the pixels in the unit block; Calculating the pixel fill rate of the LED display screen according to the ratio of the number of pixels to the total number of pixels; Whether the pixel fill rate is greater than or equal to 70% and less than or equal to 80% is judged to evaluate whether the pixel saturation of the LED display screen is qualified.

2. The method for evaluating pixel saturation of an LED display screen according to claim 1, wherein: The counting of the number of pixels whose brightness values ​​are greater than or equal to a preset brightness threshold includes: Assigning the grayscale value of a pixel whose brightness value is greater than or equal to a preset brightness threshold to the highest grayscale value corresponding to the pixel with the maximum brightness value in the unit block; Count the number of pixels with the highest grayscale value in the unit block.

3. The method for evaluating pixel saturation of an LED display screen according to claim 1, wherein: The pixel fill rate of the LED display screen is calculated based on the ratio of the number of pixels to the total number of pixels, including: Calculating a pixel filling rate of each of the unit blocks and an average pixel filling rate of all the unit blocks according to a ratio of the number of pixels to the total number of pixels; Eliminating the pixel filling rates of the unit blocks that are greater than a preset filling threshold, and retaining the pixel filling rates of the unit blocks that are less than or equal to the preset filling threshold, where the preset filling threshold is a preset multiple of the average pixel filling rate; An average value of the pixel filling rates of the retained unit blocks is calculated to obtain the pixel filling rate of the LED display screen.

4. The method for evaluating pixel saturation of an LED display screen according to claim 1, wherein: When the optical imaging device captures a display image of a single primary color of the LED display screen, the difference between the light intensity received by the optical imaging device and the light intensity emitted from the front of the LED display screen is less than 5%.

5. The method for evaluating pixel saturation of an LED display screen according to claim 1, wherein: When the optical imaging device captures a display image of a single primary color of an LED display screen, the distance x between the optical imaging device and the LED display screen satisfies the following formula: h is the height of the LED display screen, is the angle between the optical axis of the optical imaging device and the highest point of the LED display screen, and 6. A device for evaluating pixel saturation of an LED display screen, characterized in that: It includes an image acquisition module, an FPGA processing module and a DSP processing module, wherein the FPGA processing module is connected to the image acquisition module and the DSP processing module respectively; The image acquisition module is used to acquire a display image of a single primary color of the LED display screen captured by an optical imaging device, and transmit the display image to the FPGA processing module; The FPGA processing module is used to divide the display image into a plurality of unit blocks at equal intervals, and transmit the unit blocks to the DSP processing module, wherein the total number of pixels of each unit block is equal; The DSP processing module is configured to retrieve the brightness values ​​of the pixels in the unit block, count the number of pixels having brightness values ​​greater than or equal to a preset brightness threshold, and calculate the pixel fill rate of the LED display screen based on the ratio of the number of pixels to the total number of pixels, wherein the preset brightness threshold is a preset multiple of the maximum brightness value of the pixels in the unit block; The FPGA processing module is further configured to evaluate whether the pixel saturation of the LED display screen is qualified according to whether the pixel fill rate is greater than or equal to 70% and less than or equal to 80%.

7. An evaluation system comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 5 are implemented.

8. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

Images