CN114640836A - Video data mapping method, LED display controller and LED display system - Google Patents

Video data mapping method, LED display controller and LED display system Download PDF

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CN114640836A
CN114640836A CN202011484206.8A CN202011484206A CN114640836A CN 114640836 A CN114640836 A CN 114640836A CN 202011484206 A CN202011484206 A CN 202011484206A CN 114640836 A CN114640836 A CN 114640836A
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video data
video
led display
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target
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CN114640836B (en
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任怀平
严振航
吴振志
邱荣邦
吴涵渠
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Shenzhen Aoto Electronics Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/67—Circuits for processing colour signals for matrixing
    • 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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Abstract

The invention relates to a video data mapping method, an LED display controller and an LED display system, wherein the video data mapping method is used for mapping video data in an RGB Limited Range format into video data in a full gray scale Range and comprises the following steps: acquiring input video data in an RGB Limited Range format; aiming at each target pixel point in the input video data, acquiring video data of adjacent pixel points according to a preset adjacent rule, and forming video data of a target neighborhood together with the video data of the target pixel point; and weighting the video data of the target neighborhood by using the weight value corresponding to the target neighborhood, and combining the mapping coefficient to obtain the video data of the target pixel point mapped to the full gray scale range. The change of the mapped video data is more gradual, and the problem of gray scale combination cannot occur in the range of high and low gray scales; the contrast, the definition and the image quality effect can be effectively improved.

Description

Video data mapping method, LED display controller and LED display system
Technical Field
The invention relates to the field of LED display screens, in particular to a video data mapping method, an LED display controller and an LED display system.
Background
The LED display screen has the advantages of bright color, high brightness, long service life, energy conservation, high gray scale, wide visual angle, customizable shape and the like, so that the LED display screen is widely applied to scenes such as traffic, commercial advertisements, information distribution, sports events, command monitoring centers and the like. The LED display system composed of the LED display screen is a video receiving and displaying device, and only can passively receive input videos in various video formats, such as an RGB format, a YCC422 format, a YCC444 format, a YCC420 format and the like, and then output and display the input videos on the LED display screen.
The RGB format includes two formats, RGB Limited Range and RGB Full Range, because of the influence of the television industry. Taking 8-bit video data as an example, the gray scale Range of RGB Limited Range format is 16-235, while the gray scale Range of RGB Full Range format is 0-255. And the LED display screen supports the full gray scale range of 0-255. When the input video is in the RGB Limited Range format, if the input video is directly output and displayed without being processed, the loss of the low gray scale Range of 0-15 and the prompt of the high gray scale Range of 235-255 will occur, so that the display of the full gray scale Range cannot be realized, and the display effect is seriously affected.
The general solution is that when the input video is in RGB Limited Range format, the data of low gray scale is directly reduced by 16 values; for the data with high gray scale, 20 values are directly added to realize the mapping from the RGB Limited Range format to the RGB Full Range format. However, this results in a serious decrease in contrast and definition in the gray scale ranges of 0-15 and 235-255, and the image quality is not good.
Disclosure of Invention
Accordingly, it is necessary to provide a video data mapping method, an LED display controller and an LED display system for solving the problems of reduced contrast and definition in the high and low gray scale Range and poor image quality when the RGB Limited Range format is mapped to the RGB Full Range format in the conventional LED display screen.
An embodiment of the present application provides a video data mapping method for mapping video data in an RGB Limited Range format in an LED display system into video data in a full grayscale Range, including:
acquiring input video data in an RGB Limited Range format;
aiming at each target pixel point in the input video data, acquiring video data of adjacent pixel points according to a preset adjacent rule, and forming video data of a target neighborhood together with the video data of the target pixel point;
and weighting the video data of the target neighborhood by using the weight value corresponding to the target neighborhood, and combining the mapping coefficient to obtain the video data of the target pixel point mapped to the full gray scale range.
In some embodiments, the preset adjacency rule is 4 adjacency or 8 adjacency.
In some embodiments, before the step of weighting the video data of the target neighborhood by using the weight value of the corresponding target neighborhood and obtaining the video data of the target pixel point mapped to the full gray scale range by combining the mapping coefficient, the method further includes:
and preprocessing the video data of the target neighborhood.
In some embodiments, the preset adjacency rule is 8 adjacency, the target neighborhood includes a target pixel point, 4 adjacency pixel points, and diagonal adjacency pixel points, in the weight values of the target neighborhood, the weight value of the target pixel point is greater than the weight value of the 4 adjacency pixel points, and the weight value of the 4 adjacency pixel points is greater than the weight value of the diagonal adjacency pixel points.
In some embodiments, when it is determined that the target pixel is located on the boundary, in the weight values of the target neighborhood, the weight values of adjacent pixels located on a row/column on the boundary are allocated to the pixels having valid video data.
Another embodiment of the present application provides an LED display controller, including a video acquisition unit, a format recognition unit, a cache unit, a mapping unit, a video clipping unit, and a video output unit; wherein the content of the first and second substances,
the video acquisition unit is used for receiving externally input video source data and acquiring the video source data to obtain acquired video data;
the format identification unit is used for identifying the video format of video source data, and storing the collected video data to the cache unit when the video format is judged to be the RGB Limited Range format; when the video data are judged to be in other formats, transmitting the collected video data to the video cutting unit;
the mapping unit is configured to read the acquired video data from the cache unit, execute the video data mapping method according to any one of the embodiments, and map the video data in the RGB Limited Range format into video data in a full grayscale Range;
the video cutting unit is used for receiving the collected video data or the mapped video data, cutting the video data according to a preset processing strategy, and outputting the video data to the LED display screen for display through the video output unit.
In some embodiments, the video acquisition unit performs the acquisition on the received video source data line by line, and the acquired video data is composed of line video data; when the RGB Limited Range format is judged, the line video data acquired by the video acquisition unit are stored in the cache unit line by line; and when the cache unit stores a preset number of lines of video data, triggering the mapping unit to start executing the video data mapping method.
An embodiment of the present application further provides an LED display system, including LED display screen and LED display controller, the LED display controller receives external input's video data, and controls the LED display screen displays the corresponding picture, the LED display controller be any one of the foregoing embodiments the LED display controller.
Another embodiment of the present application further provides a storage medium having a computer program stored thereon, where the computer program is executed by a processor to implement the video data mapping method according to any one of the foregoing embodiments.
According to the video data mapping scheme and the LED display controller provided by the embodiment of the application, after the video data in the RGB Limited Range format is identified, when the video data in the RGB Limited Range format is mapped into the video data in the RGB Full Range format, certain weight is given to the video data of the surrounding pixel points. Therefore, the video data of the mapped pixel points are changed more smoothly, and the problem of gray scale combination cannot occur in the range of high and low gray scales; the contrast, the definition and the image quality effect can be effectively improved.
Drawings
Fig. 1 is a schematic diagram of a frame structure of an LED display system according to an embodiment of the present application;
fig. 2 is a flowchart illustrating a video data mapping method according to an embodiment of the present application;
fig. 3 is a flowchart illustrating a video data mapping method according to another embodiment of the present application;
FIG. 4 is a schematic diagram of the distribution of pixel points in a target neighborhood when 4 neighbors are used;
FIG. 5 is a schematic diagram of the distribution of pixel points in a target neighborhood when 8 neighbors are used;
fig. 6 is a schematic diagram of a frame structure of an LED display controller according to an embodiment of the present application.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. In addition, the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
As shown in fig. 2, an embodiment of the present application discloses a video data mapping method for mapping video data in RGB Limited Range format in an LED display system into video data in a full gray scale Range, including:
s100, acquiring input video data in an RGB Limited Range format;
s200, aiming at each target pixel point in input video data, acquiring video data of adjacent pixel points according to a preset adjacent rule, and forming video data of a target neighborhood together with the video data of the target pixel point;
s300, weighting the video data of the target neighborhood by using the weighted value of the corresponding target neighborhood, and combining the mapping coefficient to obtain the video data of the target pixel point mapped to the full gray scale range.
As shown in fig. 1, an LED display system includes an LED display screen 20 and an LED display controller 10, wherein the LED display controller 10 receives video data inputted from the outside and controls the LED display screen 20 to display a corresponding picture. When the LED display controller 10 receives input video data in the RGB Limited Range format, the video data mapping method according to the embodiment of the present application may be executed.
When the video data mapping method of the embodiment of the application is executed, each pixel point in the input video data in the RGB Limited Range format is mapped to the full gray scale Range. Each pixel point is a target pixel point.
Aiming at each target pixel point, determining adjacent pixel points according to a preset adjacent rule so that the adjacent pixel points and the target pixel points form a target field. The preset adjacency rule may be 4 adjacency, 8 adjacency, or m adjacency. Fig. 4 shows a target neighborhood diagram with (x, y) as a target pixel point under the 4-adjacency rule. Fig. 5 shows a schematic diagram of the target neighborhood under the 8-adjacency rule.
After the target neighborhood is obtained, the weight value of the corresponding target neighborhood can be obtained, namely different weights exist between the corresponding target pixel point and the adjacent pixel point. The weighted sum of the video data of all the pixel points in the target neighborhood can be carried out by utilizing the weighted values corresponding to the target neighborhood; multiplied by a mapping coefficient KMTherefore, the video data mapped to the Full gray scale Range of the target pixel point, namely the video data in the RGB Full Range format, can be obtained.
Generally, the weight value of a target pixel point needs to be larger than or even far larger than that of an adjacent pixel point. For example, the ratio between the two may be between 10 and 100.
The present scheme is further explained and explained below by taking the preset adjacency rule as an example to adopt 4 adjacencies.
As shown in fig. 3, after the input video data in the RGB Limited Range format is obtained, a sliding window process may be performed according to a window with a size of 3 × 3 and a step size of 1 pixel with a target pixel as a center, and the video data is captured in a sliding manner, so as to obtain sliding window data with the target pixel as the center. For each sliding window data, it can be in the form of a matrix, as shown below.
Figure BDA0002838546370000051
Wherein, (x, y) is the coordinates of the target pixel point, and a (x, y) represents the video data of the target pixel point. (x-1, y-1) … (x +1, y +1), etc. are pixels around the target pixel, and A (x-1, y-1) … A (x +1, y +1), etc. are video data of each pixel.
To simplify the description, a (x, y) may represent one of red, green, and blue data. It is understood that a (x, y) may also represent gray scale data. The following describes a scheme by taking an example in which a (x, y) represents red data.
As shown in fig. 4, for 4 neighbors, in the target field, the neighboring pixel point is a pixel point directly neighboring the target pixel point in the horizontal or vertical direction, and specifically includes (x, y-1), (x-1, y), (x, y +1), and (x +1, y). The video data a of the target neighborhood may be recorded in a matrix form, as shown below.
Figure BDA0002838546370000052
Then, a weight value W corresponding to the target neighborhood is obtained, as shown below
Figure BDA0002838546370000053
Wherein, W4The weight values of 4 adjacent target neighborhoods are adopted, w (x, y) and w (x, y) … w (x, y +1) and the like are used for representing the weight values of all pixel points in the target neighborhoods, the value is 0-1, and the sum of the ownership weight values is 1.
The mapping of the target pixel point to the video data of the full gray scale range may use the following formula.
Figure BDA0002838546370000061
Wherein, KMFor the mapping coefficient, a (x + i, y + j) is video data of each pixel point of the target neighborhood, and w (x + i, y + j) is a weight value of each pixel point of the corresponding target neighborhood.
KMThe value of (c) may be set in advance. K isMThe ratio of the maximum values in the gray scale ranges before and after the mapping calculation can be set. Exemplary, KMMay be provided as 255/235 or 256/235.
For example, assume that the sliding window data is
Figure BDA0002838546370000062
The video data of the target pixel point is 230, and the weighted value of the corresponding target neighborhood
Figure BDA0002838546370000063
KMThe value is 256/235.
Through the mapping of the video data mapping method of the embodiment, the video data A of the target pixel point mapped to the full gray scale rangeM:
AM＝256/235*[205*0.025+205*0.025+230*0.9+205*0.025+205*0.025]＝247
In the video data mapping method of the embodiment of the application, when the video data in the RGB Limited Range format is mapped to the video data in the RGB Full Range format, the video data of the surrounding pixel points are given a certain weight. Therefore, the change of the video data of the mapped pixel points is more gradual, and the problem of gray scale combination cannot occur in the range of high and low gray scales; the contrast, the definition and the image quality effect can be effectively improved.
In some embodiments, as shown in fig. 3, before step S300, the method may further include:
and S250, preprocessing the video data of the target neighborhood.
Because the human eye is more sensitive to low gray-scale values and the sensitivity of the human eye decreases when the gray-scale value increases to a certain value. Therefore, in order to make the variation curve of the video data in the low gray range after mapping larger, and make the variation curve more gentle after the gray value rises to a certain value, in step S250, the preprocessing may specifically be:
subtracting the lowest gray-scale value in the RGB Limited Range format from the video data in the preset low gray-scale Range;
and subtracting a preset value from the video data in the preset high gray Range, wherein the preset value is smaller than the lowest gray level value in the RGB Limited Range format.
For example, the gray scale Range of the RGB Limited Range format may be 16 to 235, the lowest gray scale value thereof is 16, and the predetermined value may be 5. It is understood that the predetermined value may be other positive values less than 16. The predetermined low ash range may be 16-230, and the predetermined high ash range may be 230-235. Mapping coefficient KMMay be provided as 230/200.
The following describes a scheme using a preset adjacency rule and 8 adjacencies as an example.
As shown in fig. 5, for 8 neighbors, 4 neighboring pixels and diagonal neighboring pixels are included in the target neighborhood. The target neighborhood includes a complete sliding window of data, which can be written as:
Figure BDA0002838546370000071
the pre-processing performed is: if the video data A (x, y) belongs to the preset low gray level range, executing A (x, y) -16; if the video data A (x, y) belongs to the preset high gray range, A (x, y) -5 is executed.
The preprocessed video data is denoted as a', where (x, y) represents the coordinates of a pixel point, and a (x, y) represents the video data of the preprocessed pixel point.
Figure BDA0002838546370000072
Because the pixel points of the target neighborhood include all the video data in one sliding window data. At this time, the weight value of the target neighborhood
Figure BDA0002838546370000073
Wherein, the weighted value of the target pixel point>4 weights of adjacent pixels>Weights of diagonally adjacent pixels.
By way of example, assume that the sliding window data is
Figure BDA0002838546370000074
The video data of the target pixel point is 230, and the weighted value of the corresponding target neighborhood
Figure BDA0002838546370000081
KMThe value is 230/200.
The video data of the target neighborhood is recorded as the preprocessed video data
Figure BDA0002838546370000082
The mapping formula of the video data mapping method of the embodiment is as follows:
Figure BDA0002838546370000083
through the mapping of the video data mapping method of the embodiment, the video data A of the target pixel point mapped to the full gray scale rangeM＝243。
The video data is subjected to subtraction preprocessing, so that the video data in a low-gray range has a larger change curve after being mapped, the characteristic that human eyes are more sensitive to the change of low-gray values is better met, and the low-gray display effect after mapping is improved.
It is understood that in the gray scale Range of the RGB Limited Range format, in addition to the preset low gray Range and the preset high gray Range, there may be an intermediate gray Range. For example, the predetermined low gray range may be 16-27, the predetermined high gray range may be 230-235, and the middle gray range may be 28-229. In step S250, the video data belonging to the halftone area may be left as it is without being processed when the preprocessing is performed.
In some embodiments, in some scenarios, the mapping needs to be tilted to the high gray scale range to enhance the high gray scale display effect. In this case, in the preprocessing in step S250, the video data may be increased by a certain value, for example, by a difference between the highest gray scale value in the RGB Limited Range format and the highest gray scale value in the full gray scale Range.
For example, the gray scale Range of the RGB Limited Range format may be 16-235, the highest gray scale value is 235, the difference between the highest gray scale value of the full gray scale Range and 255 is 20, and a value of 20 may be added to the video data during the pre-processing.
It is to be understood that the increased value may be different for the video data in the preset low gray range and the video data in the preset high gray range. The increased value of the video data in the preset high gray range may be 20; while video data in the preset low gray level range is increased by a value less than 20, such as 5.
In some embodiments, when it is determined that the target pixel is located at the boundary, in the sliding window data, the video data of the pixels in the row or column corresponding to the boundary may be marked as 0. At this time, the weight values of the adjacent pixels in the row/column on the boundary may be assigned to the pixels having valid video data.
For example, taking 8-way adjacency as an example, for a non-boundary target pixel point, the weighted value of the corresponding target neighborhood is
Figure BDA0002838546370000091
When the target pixel point is positioned on the boundary and not at the four cornersIn the sliding window data, the last line, the next line, the left line or the right line of the target pixel point has no effective video data. Taking the example that the target pixel point is located at the upper boundary, there is no valid video data in the upper line. At this time, after the redistribution of the weight values, the weight values corresponding to the target neighborhood
Figure BDA0002838546370000092
When the target pixel point is located on the boundary and at the four corners, there are adjacent rows and columns in the sliding window data without valid video data. At this time, after the redistribution of the weight values, the weight values corresponding to the target neighborhood
Figure BDA0002838546370000093
As shown in fig. 6, an embodiment of the present application further provides an LED display controller 10, which includes a video capture unit 100, a format recognition unit 200, a buffer unit 400, a mapping unit 500, a video clipping unit 300, and a video output unit 600; wherein, the first and the second end of the pipe are connected with each other,
the video acquisition unit 100 is configured to receive externally input video source data and acquire the video source data to obtain acquired video data;
the format recognition unit 200 is configured to recognize a video format of video source data, and when the video format is determined to be an RGB Limited Range format, store the acquired video data in the cache unit 400; when the video data is judged to be in other formats, the collected video data is transmitted to the video cutting unit 300;
a mapping unit 500, configured to read the acquired video data from the buffer unit 400, execute the video data mapping method described in the foregoing embodiment, and map the video data in the RGB Limited Range format into video data in a full gray scale Range;
and the video cutting unit 300 is configured to receive the acquired video data or the mapped video data, perform cutting processing according to a preset processing policy, and output the video data to the LED display screen for display through the video output unit 600.
The LED display controller according to the embodiment of the present application, after recognizing the video data in the RGB Limited Range format, may give a certain weight to the video data of the surrounding pixel points when mapping the video data in the RGB Limited Range format to the video data in the RGB Full Range format. Therefore, the video data of the mapped pixel points are changed more smoothly, and the problem of gray scale combination cannot occur in the range of high and low gray scales; the contrast, the definition and the image quality effect can be effectively improved.
In some embodiments, in order to improve the processing efficiency of the video data and reduce the time delay, the video acquisition unit 100 performs the acquisition on the received video source data line by line, and the acquired video data is composed of line video data; when the format is determined to be the RGB Limited Range format, the line video data acquired by the video acquisition unit 100 is stored in the buffer unit 400 line by line; when the buffer unit 400 stores a predetermined number of lines of video data, the mapping unit 500 is triggered to start executing the video data mapping method described in the foregoing embodiment, and the video data in RGB Limited Range format is mapped into the video data in the full gray scale Range. In the process of executing the video data mapping method, each time the buffer unit 400 stores one line of video data or a preset number of lines of video data, the trigger mapping unit 500 reads a corresponding number of lines of video data from the buffer unit 400.
The preset number may be set to 3 lines, so that when the buffer unit 400 stores 3 lines of video data, the sliding window processing just meeting the window size of 3 × 3 and the step length of 1 pixel point can start mapping the video data without waiting for the acquisition and buffering of a frame of complete video data. Therefore, line-level video acquisition and caching can be achieved, time delay in the LED display controller is greatly reduced compared with the existing frame-level video acquisition and caching, the processing efficiency of video data is improved, and the time delay requirement when an LED display system is used for field real-time display can be well met.
In some embodiments, the buffer unit 400 is also configured to buffer the captured video data in other formats, and the video clipping unit 300 reads the video data from the buffer unit 400 and performs clipping processing according to a preset processing policy. Therefore, the problem that the processing speeds of the video acquisition unit 100 and the video clipping unit 300 are inconsistent can be solved, and the cache unit 400 is used for caching the video data, so that the problem that the acquired video data is lost due to the fact that the processing speed of the video clipping unit 300 is low is avoided.
In some embodiments, the LED display screen 20 may be divided into a plurality of display regions, and the video output unit 600 may have a plurality of output ports, each of which is connected to one of the display regions; the preset processing strategy is specifically that video data of the area position corresponding to the output port is intercepted in the video data according to the area position of the display area connected with the output port in the whole LED display screen. In this way, the video cropping unit 300 crops the video data of the plurality of display areas according to the number of output ports.
It can be understood that, according to the proportional relationship between the video data area and the display area of the LED display screen, the preset processing strategy may further include a zoom operation.
Further, the output port may be a network port, and the video output unit 600 may further encapsulate the cut video data into a network data packet, and then output the network data packet to the LED display screen through the corresponding output port for display.
As shown in fig. 1, another embodiment of the present application provides an LED display system, which includes an LED display screen 20 and an LED display controller 10, wherein the LED display controller 10 receives externally input video data and controls the LED display screen 20 to display a corresponding picture; the LED display controller 10 is the LED display controller described in the previous embodiment.
The same advantages are also achieved because the LED display controller described in the previous embodiment is used.
Another embodiment of the present application further provides a storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the video data mapping method according to any one of the above embodiments.
The system/computer device integrated components/modules/units, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. The computer-readable storage medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
In the several embodiments provided in the present invention, it should be understood that the disclosed system and method may be implemented in other ways. For example, the system embodiments described above are merely illustrative, and for example, the division of the components is only one logical division, and other divisions may be realized in practice.
In addition, each functional module/component in each embodiment of the present invention may be integrated into the same processing module/component, or each module/component may exist alone physically, or two or more modules/components may be integrated into the same module/component. The integrated modules/components can be implemented in the form of hardware, or can be implemented in the form of hardware plus software functional modules/components.
It will be evident to those skilled in the art that the embodiments of the present invention are not limited to the details of the foregoing illustrative embodiments, and that the embodiments of the present invention are capable of being embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the embodiments being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. Several units, modules or means recited in the system, apparatus or terminal claims may also be implemented by one and the same unit, module or means in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (9)

1. A video data mapping method for mapping video data in an RGB Limited Range format in an LED display system to video data in a full gray scale Range, comprising:
acquiring input video data in an RGB Limited Range format;
aiming at each target pixel point in the input video data, acquiring video data of adjacent pixel points according to a preset adjacent rule, and forming video data of a target neighborhood together with the video data of the target pixel point;
and weighting the video data of the target neighborhood by using the weight value corresponding to the target neighborhood, and combining the mapping coefficient to obtain the video data of the target pixel point mapped to the full gray scale range.
2. The video data mapping method of claim 1, wherein the preset adjacency rule is 4 adjacency or 8 adjacency.
3. The video data mapping method of claim 1, wherein before the step of weighting the video data of the target neighborhood by using the weight value of the corresponding target neighborhood and obtaining the video data of the target pixel point mapped to the full gray scale range by combining the mapping coefficient, the method further comprises:
and preprocessing the video data of the target neighborhood.
4. The video data mapping method according to claim 2, wherein the predetermined adjacency rule is 8 adjacency, the target neighborhood includes a target pixel, 4 adjacency pixels, and diagonal adjacency pixels, and in the weight values of the target neighborhood, the weight value of the target pixel is greater than the weight value of the 4 adjacency pixels, and the weight value of the 4 adjacency pixels is greater than the weight value of the diagonal adjacency pixels.
5. The video data mapping method according to claim 4, wherein when it is determined that the target pixel is located at the boundary, the weighted values of adjacent pixels of the row/column located at the boundary among the weighted values of the target neighborhood are assigned to pixels having valid video data.
6. An LED display controller is characterized by comprising a video acquisition unit, a format identification unit, a cache unit, a mapping unit, a video cutting unit and a video output unit; wherein the content of the first and second substances,
the video acquisition unit is used for receiving externally input video source data and acquiring the video source data to obtain acquired video data;
the format identification unit is used for identifying the video format of video source data, and storing the collected video data to the cache unit when the video format is judged to be the RGB Limited Range format; when the video data are judged to be in other formats, transmitting the collected video data to the video cutting unit;
the mapping unit is used for reading the collected video data from the cache unit, executing the video data mapping method of any one of claims 1 to 5, and mapping the video data in the RGB Limited Range format into the video data in the full gray scale Range;
the video cutting unit is used for receiving the collected video data or the mapped video data, cutting the video data according to a preset processing strategy, and outputting the video data to the LED display screen for display through the video output unit.
7. The LED display controller according to claim 6, wherein the video acquisition unit performs line-by-line acquisition of the received video source data, the acquired video data consisting of line video data; when the RGB Limited Range format is judged, the line video data acquired by the video acquisition unit are stored in the cache unit line by line; and when the cache unit stores a preset number of lines of video data, triggering the mapping unit to start executing the video data mapping method.
8. An LED display system, comprising an LED display screen and an LED display controller, wherein the LED display controller receives video data input from outside and controls the LED display screen to display a corresponding picture, and is characterized in that the LED display controller is the LED display controller of claim 6 or 7.
9. A storage medium having stored thereon a computer program, characterized in that the computer program, when executed by a processor, implements the video data mapping method of any of claims 1-5.
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