CN115512647A - Method, device, system and medium for evaluating pixel saturation of LED display screen - Google Patents
Method, device, system and medium for evaluating pixel saturation of LED display screen Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/029—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
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Abstract
The application relates to a method, a device, a system and a medium for evaluating pixel saturation of an LED display screen. A method for evaluating pixel saturation of an LED display screen comprises the following steps: acquiring a display image of a single primary color of an LED display screen shot by an optical imaging device; equally spacing the display image into a plurality of unit blocks, wherein the total number of pixels of each unit block is equal; retrieving the brightness values of the pixels in the unit block, and counting the number of the pixels of which the 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 calculating the pixel filling rate of the LED display screen according to the proportion of the number of the pixels to the total number of the pixels.
Description
Technical Field
The application belongs to the technical field of LED display screens, and particularly relates to a method, a device, a system and a medium for evaluating pixel saturation of an LED display screen.
Background
The LED display screen has the characteristics of high brightness, bright color, high luminous efficiency, high contrast, short response time, wide working temperature range, low energy consumption and the like, and is widely applied to stage display equipment, advertisement display equipment, data visualization display equipment and commercial display equipment. Structurally, the LED display screen is formed by a plurality of independent LED lamp beads in a PCB circuit connection mode, then is spliced into independent boxes by a plurality of display panels, and finally is spliced into a final complete screen body by a plurality of independent boxes.
However, while having this advantage, other negative problems derive from this functional structure, such as moire problem of image when the screen display content is photographed, and the pixel saturation degree of the LED display screen is a key factor affecting this problem, and the moire problem when the pixel saturation degree of the LED display screen is higher is more slight, but the too good pixel saturation degree may reduce the image sharpness and impair the image visual effect. Therefore, in order to solve the moire problem and not reduce the image quality, the pixel saturation degree of the LED display screen needs to be designed reasonably, and the primary work of evaluating the pixel saturation degree of the LED display screen is to objectively quantify the pixel saturation degree of the LED display screen, but at present, a method for objectively quantifying the pixel saturation degree of the LED display screen is unavailable.
Disclosure of Invention
In view of this, embodiments of the present application provide a method, an apparatus, a system, and a medium for evaluating a pixel saturation of an LED display panel, so as to solve a problem in the prior art that the pixel saturation of the LED display panel cannot be objectively quantified.
The first aspect of the embodiments of the present application provides a method for evaluating pixel saturation of an LED display screen, including: acquiring a display image of a single primary color of an LED display screen shot by an optical imaging device; equally spacing the display image into a plurality of unit blocks, wherein the total number of pixels of each unit block is equal; retrieving the brightness values of the pixels in the unit block, and counting the number of the pixels of which the 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 calculating the pixel filling rate of the LED display screen according to the proportion of the number of the pixels to the total number of the pixels.
With reference to the first aspect, in a first possible implementation manner of the first aspect, the counting the number of pixels whose luminance values are greater than or equal to a preset luminance threshold includes: assigning the gray value of the pixel with the brightness value larger than or equal to a preset brightness threshold value as the highest gray value corresponding to the pixel with the maximum brightness value in the unit block; and counting the number of the pixels with the highest gray value in the unit block.
With reference to the first aspect, in a second possible implementation manner of the first aspect, the calculating the pixel filling rate of the LED display screen according to the proportion of the number of pixels to the total number of pixels includes: calculating the pixel filling rate of each unit block and the average pixel filling rate of all the unit blocks according to the proportion of the number of the pixels to the total number of the pixels; rejecting the pixel filling rate of the unit block which is greater than a preset filling threshold value, and reserving the pixel filling rate of the unit block which is less than or equal to the preset filling threshold value, wherein the preset filling threshold value is a preset multiple of the average pixel filling rate; and calculating the average value of the pixel filling rates of the reserved unit blocks to obtain the pixel filling rate of the LED display screen.
With reference to the first aspect, in a third possible implementation manner of the first aspect, when the optical imaging device captures a display image of a single primary color of the LED display screen, a difference between light intensity received by the optical imaging device and light intensity emitted by the front surface of the LED display screen is less than 5%.
With reference to the first aspect, in a fourth possible implementation manner 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:
h is the height of the LED display screen,
is an angle formed by the optical axis of the optical imaging device and the highest point of the LED display screen, and
with reference to the first aspect, in a fifth possible implementation manner of the first aspect, after the calculating the pixel filling rate of the LED display screen according to the proportion of the number of pixels to the total number of pixels, the method further includes: and judging whether the pixel filling rate is greater than or equal to 70% and less than or equal to 80% or not to evaluate whether the pixel saturation of the LED display screen is qualified or not.
A second aspect of the embodiment of the application provides an evaluation device for pixel saturation of an LED display screen, which includes an image acquisition module, an FPGA processing module, and a DSP processing module, where the FPGA processing module is connected to the image acquisition module and the DSP processing module respectively; the image acquisition module is used for acquiring a display image of the optical imaging equipment for imaging the single primary color of the LED display screen and transmitting the display image to the FPGA processing module; the FPGA processing module is used for dividing the display image into a plurality of unit blocks at equal intervals and transmitting the unit blocks to the DSP processing module, and the total number of pixels of each unit block is equal; the DSP processing module is used for retrieving the brightness values of the pixels in the unit block, counting the number of the pixels of which the brightness values are larger 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 filling rate of the LED display screen according to the proportion of the number of the pixels to the total number of the pixels.
With reference to the second aspect, in a first possible implementation manner of the second aspect, the FPGA processing module is further configured to evaluate whether the saturation of the pixel of the LED display screen is qualified according to the pixel filling rate.
A third aspect of embodiments 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, the processor implementing the steps of the method according to any one of the first aspect when executing the computer program.
A fourth aspect of embodiments of the present application provides a computer-readable storage medium, in which a computer program is stored, which, when executed by a processor, performs the steps of the method according to any one of the first aspect.
Compared with the prior art, the embodiment of the application has the advantages that: the pixel filling rate of the LED display screen is obtained through calculation by carrying out unit block segmentation, brightness value retrieval and pixel number statistics on a display image of a single primary color of the LED display screen, and the pixel saturation of the LED display screen is represented by utilizing the pixel filling rate, so that the pixel saturation of the LED display screen can be accurately and objectively quantified; and then comparing the pixel filling rate of the LED display screen after the pixel saturation quantization with a qualified standard, reasonably evaluating the pixel saturation of the LED display screen, and producing the LED display screen which can achieve the effect of relieving the image moire of the screen body and can not reduce the image display sharpness.
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In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic implementation flow chart of a method for evaluating pixel saturation of an LED display screen according to an embodiment of the present disclosure;
FIG. 2 is a diagram of a light intensity distribution of a green primary color of an LED display screen according to an embodiment of the present application;
FIG. 3 is a partial view of a display image provided by an embodiment of the present application;
FIG. 4 is a diagram illustrating a display image divided into a plurality of unit blocks according to an embodiment of the present application;
FIG. 5 is a diagram illustrating Y values of pixels in a display image according to an embodiment of the present application;
FIG. 6 is a schematic diagram of assigning values to respective pixels according to an embodiment of the present application;
fig. 7 is a schematic diagram of an apparatus for evaluating pixel saturation of an LED display panel according to an embodiment of the present disclosure.
Fig. 8 is a schematic diagram of an evaluation system provided in an embodiment of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
In order to explain the technical solution described in the present application, the following description will be given by way of specific examples.
When the LED display screen is shot, the pixel saturation degree of the LED display screen can influence the shot image to have the Moire problem, the pixel saturation degree of the LED display screen is mainly influenced by the light-emitting angle of the minimum light-emitting unit of the LED display screen, the smaller the light-emitting angle is, the worse the pixel saturation degree of the LED display screen is, the higher the spatial frequency of a display picture is, and the more serious the Moire problem of the shot image is; the larger the light-emitting angle is, the higher the pixel saturation degree of the LED display screen is, and the lower the spatial frequency of the display screen is, the more slight the moire problem occurs in the photographed image, but the too good pixel saturation simultaneously reduces the image sharpness and deteriorates the image visual effect. Therefore, in order to solve the moire problem during shooting, the image quality cannot be reduced, the pixel saturation of the LED display screen needs to be reasonably designed, and the moire problem cannot be solved and the image quality cannot be reduced only if the pixel saturation of the designed LED display screen reaches the qualified standard.
Therefore, in the design and research and development process of the LED display screen, it is necessary to evaluate whether the pixel saturation of the LED display screen meets the qualified standard, a human eye visual observation method is adopted in the industry to evaluate the pixel saturation of the LED display screen at present, human eye visual characteristics have differences, subjective observation results of different observers can cause different evaluation results of the pixel saturation of the LED display screen, and the expertise and reliability are lacked.
Based on the problems in the prior art, the embodiment of the application provides an evaluation method, device, system and medium for the pixel saturation of an LED display screen, the pixel filling rate of the LED display screen is obtained through calculation by processing a display image of the LED display screen, the pixel saturation of the LED display screen is represented by the pixel filling rate, and the pixel saturation of the LED display screen can be accurately and objectively quantified; and then the pixel filling rate is compared with the qualified standard, the pixel saturation of the LED display screen is reasonably evaluated, and the LED display screen which can relieve the effect of camera moire of the screen body and can not reduce the image display sharpness is produced.
As shown in fig. 1, a first aspect of the embodiments of the present application provides a method for evaluating pixel saturation of an LED display screen, including the following steps:
s101, acquiring a display image of a single primary color of an LED display screen shot by an optical imaging device;
the optical imaging device is used for shooting and imaging a display picture of the LED display screen, the optical imaging device can select an XYZ optical filter camera, a single lens reflex camera and the like, and the lens adopts a non-wide-angle zoom lens. For example, an XYZ filter camera may be used in the embodiments of the present application, and since the embodiments of the present application mainly use the luminance value of light to calculate, only the Y filter of the XYZ filter camera needs to be used for shooting. The XYZ filter camera simulates the response of human eyes to light by selecting X, Y, Z three filters, so that XYZ tristimulus values of a shot image are directly obtained. The XYZ tristimulus values are calculated using three standard observer color matching functions, the standard 1931CIE system defining standard observers that conform to the color matching functions x (λ), y (λ), and z (λ).
The LED display screen is an LED display screen body composed of a plurality of LED light sources, the type of the LED display screen is not limited in the embodiment of the application, and the LED display screen comprises all display screens in the known range of monochrome, color and the like; the display pictures of the LED display screen participating in the pixel saturation evaluation are not limited, and can be any pictures under the condition that the LED display screen is lightened. It should be noted that when the picture of the LED display panel participating in the pixel saturation evaluation has multiple primary colors, the evaluation should be performed for a single primary color, and there should be no hidden light or dark light of other primary colors in the single primary color so as not to interfere with the evaluation result.
For example, the LED display screen of the embodiment of the present application may adopt a COB (chip on board package) display module, the size of which is 170mm × 150mm × 60mm, which represents the length, width, and height of the LED display screen, a picture of the LED display screen participating in saturation evaluation includes three primary colors of red, green, and blue, when a single primary color is displayed, there should be no hidden brightness or hidden brightness of the other two primary colors so as to avoid interference with the evaluation result, in an actual situation, 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 adopts a green primary color as an exemplary illustration, and as shown in fig. 2, the light intensity distribution of each angle of the green LED light source is shown. It can be understood that the light intensity distribution presented is different from that shown in fig. 2 according to different LED display screen light sources.
As a preferred implementation manner of the embodiment of the present application, when the optical imaging device captures a display image of a single primary color of the LED display screen, a difference between light intensity received by the optical imaging device and light intensity emitted from the front surface of the LED display screen is less than 5%.
When the optical imaging device shoots and images the LED display screen, the optical axis of the optical imaging device receives light intensity emitted by the LED light sources, and because the LED display screen is provided with a plurality of LED light sources distributed at different positions to emit light, a certain angle exists between the optical axis of the optical imaging device and a connecting line of the LED light sources to emit light, so that the optical imaging device receives the light intensity of the LED light sources distributed at different positions, and therefore, when the optical imaging device shoots and images, the difference between the light intensity received by the optical axis of the optical imaging device and the light intensity emitted by the front side of the LED light sources needs to be ensured to be less than 5%.
As a preferred implementation manner of the embodiment of the present application, when the optical imaging device captures a display image of a single primary color of the LED display screen, a distance x between the optical imaging device and the LED display screen satisfies the following formula:
wherein h is the height of the LED display screen,
is the angle formed by the optical axis of the optical imaging device and the highest point of the LED display screen, and
in order to reduce the interference of the light intensity direction of the LED light source on the LED display screen to the shooting of the optical imaging device, the embodiment of the present application provides requirements for the relative position between the optical imaging device and the LED display screen, and the setting needs to be performed with reference to the light intensity distribution of the light emitting angle of the LED light source on the LED display screen, specifically, the setting needs to be performed with reference to the angle formed by the optical axis of the lens of the optical imaging device and the highest point of the LED display screen
Less than 2 is required.
Because this application needs to control the distance between optical imaging equipment and the LED display screen, consequently, the LED display screen corresponds and disposes displacement device, and displacement device can be machinery or non-mechanical accurate positioning device such as rotary platform or removal slide rail for support the required LED display screen position control of this application embodiment and coaxial rotation demand. Illustratively, the displacement device can adopt a mechanical positioning device, can accurately control the relative distance between the LED display screen and the XYZ filter camera, and can accurately control the relative distance between the LED display screen and the XYZ filter camera according to the size data of the LED display screen and the formula tan
It can be known that, in order to ensure the optical axis of the XYZ filter camera lens and the LED display screenAngle of highest point
And the moving distance of the LED display screen controlled by the displacement device is required to meet the requirement that the vertical distance x between the LED display screen and the XYZ filter camera is larger than 860mm.
Preferably, when the optical imaging device is used for shooting and imaging the LED display screen, the display picture of the LED display screen is shot in the environment with the reflection illumination smaller than 101ux, so that the influence of ambient light on the image shot by the LED display screen can be avoided; the imaging area of the display picture of the LED display screen is larger than 4/5 of the imaging area of the photosensitive element of the optical imaging device, so that a certain number of effective pixels participating in pixel saturation evaluation can be ensured in the display image; the imaging gray scale of the LED display screen is controlled in the linear working area of the photosensitive element of the optical imaging device by adjusting a plurality of parameters of the optical imaging device, such as exposure time, aperture size, ISO photosensitive value, focusing ring and the like, so that the received light intensity can be faithfully recorded by the photosensitive element and is closer to the photosensitive characteristic of human eyes, an obvious black-and-white image pixel boundary is required to be arranged between pixels in a displayed image and cannot be in the condition of overexposure or insufficient photosensitive, the specific parameters of the optical imaging device need to be adjusted adaptively by combining the comprehensive performance of the device, and the embodiment of the application does not limit the imaging gray scale.
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;
in step S102, in order to ensure a certain number of effective pixels within a unit block, the display image is divided into a plurality of unit blocks at equal intervals, and the total number of image pixels within each unit block is equal. Exemplarily, as shown in fig. 3, a partial view of an XYZ filter camera after shooting a display image of a green primary color of an LED display screen and performing graying processing is shown, for convenience of understanding, a display screen of the LED display screen specifically adopts LED light sources to uniformly distribute light for imaging, and the LED display screens in the shot display image are regularly arranged in a form of a light cluster; fig. 4 shows one of the division modes of the image displayed in fig. 3, in which the pixel clusters of the LED display panel are equally spaced and rectangular into a plurality of rectangular unit blocks with the same size.
S103, retrieving the brightness value of the pixels in the unit block, and counting the number of the pixels of which the brightness value is 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;
in step S103, for each unit block, pixel data of the LED display screen in the unit block is processed, for example, as shown in fig. 5, which is a schematic diagram of the pixel data in fig. 4 after signal processing is performed, and the brightness values of the respective pixels are identified by using numbers 1 to 5 (where, the numbers 1 to 5 are not specific brightness values, but degrees of the brightness values), since the optical imaging device in the embodiment of the present application specifically uses Y filter shooting in an XYZ filter camera to correspondingly obtain the brightness values of the LED display screen, the number here represents the imaging Y value corresponding to the pixel, and the larger the number is, the larger the Y value of the representative pixel is, the higher the grayscale value corresponding to the pixel is, the pixel Y values in the unit block are sequentially searched, and the pixel with the brightness value in the unit block being greater than or equal to the preset brightness threshold is found.
The preset brightness threshold is a preset multiple of the maximum brightness value of the pixel in the current unit block, that is, the maximum Y value × n% in the unit block in the embodiment of the present application, and the specific multiple may be determined according to the characteristics of the LED display screen and the actual operation experience, and may specifically be 10% in the embodiment of the present application.
In order to make the statistics of the number of pixels strict and normative, in this embodiment of the present application, the pixel Y value whose luminance value is greater than or equal to the preset luminance threshold may be assigned as the gray value corresponding to the pixel with the maximum Y value, as a preferred implementation manner of this embodiment of the present application, where the counting the number of pixels whose luminance value is greater than or equal to the preset luminance threshold includes: assigning the gray value of the pixel with the brightness value larger than or equal to a preset brightness threshold value as the highest gray value corresponding to the pixel with the maximum brightness value in the unit block; and counting the number of the pixels with the highest gray value in the unit block.
In practical signal processing operations, for example, the gray scale value of the pixel with Y value within the cell block being greater than or equal to the maximum Y value × n% within the cell block is assigned as the highest gray scale value, and the gray scale value of the pixel with Y value within the cell block being less than the maximum Y value × n% within the cell block is assigned as the lowest gray scale value, as shown in fig. 6, the lowest gray scale value is represented by numeral 0, the highest gray scale value is represented by numeral 5, all the gray scale values of the pixels with Y values greater than or equal to 2 in fig. 5 are assigned as 5, and all the gray scale values of the pixels with Y values less than 2 are assigned as 0, so that it is more convenient and strict to count the number of the image pixels with the highest gray scale values within the cell block.
And S104, calculating to obtain the pixel filling rate of the LED display screen according to the proportion of the number of the pixels to the total number of the pixels.
As a preferred implementation manner of the embodiment of the present application, step S104 specifically includes the following steps:
s1041, calculating pixel filling rates of all unit blocks of the LED display screen: calculating the pixel filling rate of each unit block according to the proportion of the number of the pixels to the total number of the pixels, and calculating the average pixel filling rate according to the average value of the pixel filling rates of all the unit blocks;
s1042, eliminating the pixel filling rate with larger data difference: rejecting the pixel filling rate of the unit block larger than a preset filling threshold value, and reserving the pixel filling rate of the unit block smaller than or equal to the preset filling threshold value, wherein the preset filling threshold value is a preset multiple of the average pixel filling rate, the preset multiple is defined according to the LED display screen characteristics and the actual operation experience, and can be any numerical value larger than or equal to 30%;
s1043, calculating a pixel filling rate of the LED display screen: and calculating the average value of the pixel filling rates of the reserved unit blocks to obtain the pixel filling rate of the LED display screen.
In step S104, the pixel filling rate of each unit block in the LED display screen is calculated first, the pixel filling rates of all unit blocks in the LED display screen are used as data samples to perform further data screening, the pixel filling rates with large differences are eliminated, and finally the pixel filling rate of the LED display screen is calculated to represent the pixel saturation of the LED display screen.
And S105, judging whether the pixel filling rate is more than or equal to 70% and less than or equal to 80% or not, and evaluating whether the pixel saturation of the LED display screen is qualified or not.
In step S105, after the pixel filling rate of the LED display screen is obtained through calculation, the pixel saturation of the LED display screen is objectively quantized by using the pixel filling rate, and if the pixel filling rate of the LED display screen is within a range that is greater than or equal to 70% and less than or equal to 80%, the pixel saturation of the LED display screen is determined to be qualified, the LED display screen can alleviate the moire problem occurring in the photographed image, and at the same time, the display sharpness of the photographed image is not reduced, so that the LED display screen meets the production standard of the LED display screen.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
As shown in fig. 7, a second aspect of the embodiments of the present application provides an apparatus for evaluating pixel saturation of an LED display screen, which processes a display image captured by an optical imaging device and imaged by the LED display screen based on an FPGA and a DSP as implementation media of image processing, and the apparatus mainly includes an image obtaining module 701, an FPGA processing module 702, and a DSP processing module 703;
the image obtaining module 701 is connected to the optical imaging device, and is configured to obtain a display image of the optical imaging device for single primary color imaging of the LED display screen, perform digital-to-analog conversion on a signal of the display image, and transmit the signal to the FPGA processing module 702.
The FPGA processing module 702 is connected to the image obtaining module 701, and is configured to perform graying processing on the display image after receiving the display image transmitted by the image obtaining module 701, divide the grayed display image into a plurality of unit blocks at equal intervals, and transmit the unit blocks to the DSP processing module 703, where the total number of pixels of each unit block is equal. The specific implementation process of the FPGA processing module 702 for segmenting the display image may refer to the method corresponding to the first aspect of the embodiment of the present application, and is not further described herein. In addition, the embodiment of the present application does not limit the model of the main control chip of the FPGA processing module 702, and for example, a chip with a model of XC4VSX35 may be selected; it can be understood that the FPGA processing module 702 is correspondingly configured with an MCU module (a chip with model number STM32F103C8T6 may be selected) to complete various initial settings on the FPGA processing module 702.
The DSP processing module 703 is connected to the FPGA processing module 702, and is configured to retrieve the luminance values of the pixels in the unit block, count the number of pixels whose luminance values are greater than or equal to a preset luminance threshold, calculate the pixel filling rate of the LED display screen according to the proportion of the number of pixels to the total number of pixels, and transmit the pixel filling rate of the LED display screen back to the FPGA processing module 702, where the preset luminance threshold is a preset multiple of the maximum luminance value of the pixels in the unit block. The specific implementation process of the DSP processing module 703 for calculating the pixel filling rate may refer to a method corresponding to the first aspect of the embodiment of the present application, and will not be described herein. In addition, the embodiment of the present application does not limit the model of the main control chip of the DSP processing module 703, and for example, a chip with the model of TMS320C6416 may be selected.
The FPGA processing module 702 is further configured to receive the pixel filling rate of the LED display screen returned by the DSP processing module 703, and a preset comparator is arranged in the FPGA processing module 702, and is capable of evaluating whether the pixel saturation of the LED display screen is qualified according to the pixel filling rate and outputting an evaluation result. The specific implementation process of the FPGA processing module 702 for evaluating whether the saturation of the pixels of the LED display screen meets the qualified standard may refer to the method corresponding to the first aspect of the embodiment of the present application, and is not further described herein.
As shown in fig. 8, a third aspect of the embodiments of the present application provides an evaluation system, which includes a memory 81, a processor 80, and a computer program 82 stored in the memory 81 and operable on the processor 80, where the processor 80, when executing the computer program 82, implements the steps of the method according to any one of the first aspect.
A fourth aspect of embodiments of the present application provides a computer-readable storage medium, in which a computer program is stored, which, when executed by a processor, performs the steps of the method according to the first aspect.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other ways. For example, the above-described embodiments of the apparatus/terminal device are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the processes in the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, which can be stored in a computer readable storage medium, and when the computer program is executed by a processor, the steps of the methods described above can be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U.S. disk, removable hard disk, magnetic diskette, optical disk, computer Memory, read-Only Memory (ROM), random Access Memory (RAM), electrical carrier wave signal, telecommunications signal, and software distribution medium, etc. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media which may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A method for evaluating pixel saturation of an LED display screen is characterized by comprising the following steps:
acquiring a display image of a single primary color of an LED display screen shot by an optical imaging device;
equally spacing the display image into a plurality of unit blocks, wherein the total number of pixels of each unit block is equal;
retrieving the brightness values of the pixels in the unit block, and counting the number of the pixels of which the 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 calculating the pixel filling rate of the LED display screen according to the proportion of the number of the pixels to the total number of the pixels.
2. The method of claim 1, wherein the counting the number of pixels with a luminance value greater than or equal to a preset luminance threshold comprises:
assigning the gray value of the pixel with the brightness value larger than or equal to a preset brightness threshold value as the highest gray value corresponding to the pixel with the maximum brightness value in the unit block;
and counting the number of the pixels with the highest gray value in the unit block.
3. The method according to claim 1, wherein the step of calculating the pixel filling rate of the LED display screen according to the ratio of the number of the pixels to the total number of the pixels comprises:
calculating the pixel filling rate of each unit block and the average pixel filling rate of all the unit blocks according to the proportion of the number of the pixels to the total number of the pixels;
rejecting the pixel filling rate of the unit block larger than a preset filling threshold value, and reserving the pixel filling rate of the unit block smaller than or equal to the preset filling threshold value, wherein the preset filling threshold value is a preset multiple of the average pixel filling rate;
and calculating the average value of the pixel filling rates of the reserved unit blocks to obtain the pixel filling rate of the LED display screen.
4. The method for evaluating the pixel saturation of the LED display screen according to claim 1, wherein when the optical imaging device captures the 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 surface of the LED display screen is less than 5%.
5. The method for evaluating the pixel saturation of the 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, a 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 formed by the optical axis of the optical imaging device and the highest point of the LED display screen, and
6. the method as claimed in claim 1, further comprising, after calculating the pixel fill factor of the LED display screen, the steps of:
and judging whether the pixel filling rate is greater than or equal to 70% and less than or equal to 80% or not to evaluate whether the pixel saturation of the LED display screen is qualified or not.
7. The device for evaluating the pixel saturation of the LED display screen is characterized by comprising an image acquisition module, an FPGA processing module and a DSP processing module, wherein the FPGA processing module is respectively connected with the image acquisition module and the DSP processing module;
the image acquisition module is used for acquiring a display image of a single primary color of an LED display screen shot by an optical imaging device and transmitting the display image to the FPGA processing module;
the FPGA processing module is used for dividing the display image into a plurality of unit blocks at equal intervals and transmitting 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 used for retrieving the brightness values of the pixels in the unit block, counting the number of the pixels of which the brightness values are larger than or equal to a preset brightness threshold value, and calculating the pixel filling rate of the LED display screen according to the proportion of the number of the pixels to the total number of the pixels, wherein the preset brightness threshold value is a preset multiple of the maximum brightness value of the pixels in the unit block.
8. The device for evaluating the pixel saturation of the LED display screen according to claim 7, wherein the FPGA processing module is further configured to evaluate whether the pixel saturation of the LED display screen is qualified according to the pixel filling rate.
9. An evaluation system comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1 to 6 when executing the computer program.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 6.
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| CN117995112A (en) * | 2024-04-01 | 2024-05-07 | 瑞旦微电子技术(上海)有限公司 | Demura data processing method and display device based on self-adaptive rectangular partitioning |
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| CN117995112A (en) * | 2024-04-01 | 2024-05-07 | 瑞旦微电子技术(上海)有限公司 | Demura data processing method and display device based on self-adaptive rectangular partitioning |
| CN117995112B (en) * | 2024-04-01 | 2024-05-31 | 瑞旦微电子技术(上海)有限公司 | Demura data processing method and display device based on self-adaptive rectangular partitioning |
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