CN113936590A - Brightness correction method and device based on virtual pixel LED display screen and display system - Google Patents

Brightness correction method and device based on virtual pixel LED display screen and display system Download PDF

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CN113936590A
CN113936590A CN202111248712.1A CN202111248712A CN113936590A CN 113936590 A CN113936590 A CN 113936590A CN 202111248712 A CN202111248712 A CN 202111248712A CN 113936590 A CN113936590 A CN 113936590A
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lamp
brightness
point
lamp point
image
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CN113936590B (en
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王利文
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Colorlight Cloud Technology Co Ltd
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Colorlight Cloud Technology Co Ltd
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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]
    • 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
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen

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Abstract

The invention relates to the technical field of LED screen correction, and particularly discloses a brightness correction method, a brightness correction device and a brightness correction system based on a virtual pixel LED display screen, wherein the method comprises the following steps: acquiring corresponding X lamp point brightness images of the virtual pixel LED display screen according to a preset jumping point number N; calculating the average value of the lamp point brightness of the corresponding lamp point brightness image; selecting a reference brightness image, and calculating brightness resetting coefficients of the brightness images of the other lamp points with the same color; calculating a lamp point brightness reset value of a lamp point in the corresponding lamp point brightness image according to the brightness reset coefficient; and calculating and issuing a combined correction coefficient of the virtual pixel LED display screen according to the lamp point brightness value or the lamp point brightness reset value of the lamp point in each lamp point brightness image. The method and the device combine the difference between the virtual pixel display principle and the common LED screen display principle to realize the brightness correction of the virtual pixel LED display screen and solve the problem that the brightness of the virtual pixel LED display screen cannot be corrected.

Description

Brightness correction method and device based on virtual pixel LED display screen and display system
Technical Field
The invention relates to the technical field of LED screen correction, in particular to a brightness correction method, a brightness correction device and a brightness correction system based on a virtual pixel LED display screen.
Background
The virtual pixel is a relationship that the number of physical pixels on the display screen and the number of pixels actually displayed are 1: N (N is 2X2), and it can display 2 times more image pixels than the actual pixels on the display screen. The virtual pixel has the following advantages: under the same number of the lamp tubes, the virtual pixel display is equivalent to four times of the effect of real pixel display, and the display performance can be improved; the virtual pixel large screen can use one fourth of the lamp tubes with the same resolution, and can achieve the visual effect that real pixels use a plurality of lamp tubes with the same visual effect, the cost of the full-color large screen of the virtual surface sticker is mainly on the lamp tubes, and the manufacturing cost of the whole screen can be greatly reduced; the fatigue of people when watching can be reduced by using the virtual pixels, because the more uniformly the luminous points are distributed on the LED large screen, the more uniformly the luminous points are emitted in the same area, and the fatigue of people when watching is lower. Virtual pixels are the technology of the most advanced LED displays in the world today, and the use of virtual pixels means that the world is headed.
Because the specificity of the virtual pixels is not suitable for the conventional brightness correction method of the LED display screen, a new technical solution is needed to solve the above-mentioned problems.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a brightness correction method, a brightness correction device and a brightness correction system based on a virtual pixel LED display screen.
The invention discloses a brightness correction method based on a virtual pixel LED display screen, which comprises the following steps:
acquiring corresponding X lamp point brightness images of the virtual pixel LED display screen according to a preset jumping point number N; all the lamp points in each lamp brightness image have the same color, and X is (N +1)2；
Calculating the average value of the lamp point brightness of the corresponding lamp point brightness image according to the lamp point brightness value of the lamp point in each lamp point brightness image;
selecting a reference brightness image from a plurality of lamp brightness images with the same lamp point color, and calculating a corresponding brightness resetting coefficient according to the average value of the lamp point brightness of the reference brightness image and the lamp brightness of the other lamp brightness images with the same lamp point color;
calculating a lamp point brightness reset value of a lamp point in the corresponding lamp point brightness image according to the brightness reset coefficient;
calculating a combined correction coefficient of the virtual pixel LED display screen according to the lamp point brightness value or the lamp point brightness reset value of the lamp point in each lamp point brightness image;
and issuing the combined correction coefficient to a receiving card corresponding to the virtual pixel LED display screen.
Further, calculating a corresponding brightness resetting coefficient according to the average value of the lamp brightness of the reference brightness image and the lamp brightness images with the same lamp colors, includes:
the luminance resetting coefficient K is mean 'and mean, where mean' is the average value of the lamp luminance of the reference luminance image, and mean is the average value of the lamp luminance of the other lamp luminance images having the same lamp color as the reference luminance image.
Further, calculating a lamp brightness reset value corresponding to a lamp in the lamp brightness image according to the brightness reset coefficient includes:
and the lamp brightness reset value l' of the lamp in the lamp brightness image is K × l, wherein l is the lamp brightness value of a certain lamp in the lamp brightness image.
Further, calculating a combined correction coefficient of the virtual pixel LED display screen according to the lamp brightness value or the lamp brightness reset value of the lamp in each lamp brightness image, including:
acquiring a lamp point brightness value or a lamp point brightness reset value of a lamp point in a lamp point brightness image;
calculating a correction coefficient corresponding to each lamp point, wherein the correction coefficient is the ratio of the target brightness value of the lamp point to the lamp point brightness value of the lamp point or the lamp point brightness reset value of the lamp point;
and generating a correction coefficient matrix as a combined correction coefficient according to the arrangement mode of the lamp points in the virtual pixel LED display screen.
Further, calculating a combined correction coefficient of the virtual pixel LED display screen according to a lamp luminance value or a lamp luminance reset value of a lamp in each lamp luminance image, further comprising:
and normalizing the correction coefficients to enable the values of all the correction coefficients to be more than or equal to 0 and less than or equal to 1.
Further, the correction coefficients are normalized using min-max normalization.
Further, four adjacent light points in two adjacent rows of light points in the virtual pixel LED display screen are: two red light points, one blue light point and one green light point; or, two green light points, one blue light point, one red light point; or two blue light points, one green light point, one red light point.
Further, the number N of the preset hops is an odd number greater than or equal to 1.
The invention also includes a brightness correction device based on the virtual pixel LED display screen, which includes: the device comprises a lamp point brightness image acquisition module, a lamp point brightness average value calculation module, a lamp point brightness resetting module, a combined correction coefficient generation module and a coefficient issuing module, wherein:
the lamp point brightness image acquisition module is connected with the lamp point brightness average value calculation module, the lamp point brightness resetting module and the combined correction coefficient generation module and is used for acquiring the lamp point brightness images of the corresponding X virtual pixel LED display screens according to the preset jumping point number N; all the lamp points in each lamp brightness image have the same color, and X is (N +1)2；
The lamp point brightness average value calculating module is connected with the lamp point brightness image collecting module and the lamp point brightness resetting module and is used for calculating the lamp point brightness average value of the corresponding lamp point brightness image according to the lamp point brightness value of the lamp point in each lamp point brightness image;
the lamp point brightness resetting module is connected with the lamp point brightness image acquisition module, the lamp point brightness average value calculation module and the combined correction coefficient generation module, and is used for selecting a reference brightness image from a plurality of lamp point brightness images with the same lamp point color and calculating a corresponding brightness resetting coefficient according to the reference brightness image and the lamp point brightness average values of other lamp point brightness images with the same lamp point color; and calculating a lamp brightness reset value corresponding to the lamp in the lamp brightness image according to the brightness reset coefficient;
the combined correction coefficient generation module is connected with the lamp point brightness image acquisition module, the lamp point brightness resetting module and the coefficient issuing module and used for calculating a combined correction coefficient of the virtual pixel LED display screen according to the lamp point brightness value or the lamp point brightness resetting value of the lamp point in each lamp point brightness image;
and the coefficient issuing module is connected with the combined correction coefficient generating module and is used for issuing the combined correction coefficient to the receiving card corresponding to the virtual pixel LED display screen.
The invention also comprises a virtual pixel LED display system, which comprises a brightness correction device, a camera, a virtual pixel LED display screen and a receiving card, wherein:
the camera is in communication connection with the brightness correction device, is positioned in front of the virtual pixel LED display screen and is used for shooting X lamp lighting images of the virtual pixel LED display screen for lighting part of lamps under the preset jumping point number N; all the lamp points in each lamp brightness image have the same color, and X is (N +1)2；
The brightness correction device is in communication connection with the camera and the receiving card and is used for acquiring an image of the lighting degree of the X lamps; calculating the average value of the lamp point brightness of the corresponding lamp point brightness image according to the lamp point brightness value of the lamp point in each lamp point brightness image; selecting a reference brightness image from a plurality of lamp brightness images with the same lamp point color, and calculating a corresponding brightness resetting coefficient according to the average value of the lamp point brightness of the reference brightness image and the lamp brightness of the other lamp brightness images with the same lamp point color; calculating a lamp point brightness reset value of a lamp point in the corresponding lamp point brightness image according to the brightness reset coefficient; calculating a combined correction coefficient of the virtual pixel LED display screen according to the lamp point brightness value or the lamp point brightness reset value of the lamp point in each lamp point brightness image; and, the combined correction coefficient is issued to the receiving card;
the receiving card is in communication connection with the brightness correction device and the virtual pixel LED display screen, receives the combined correction coefficient and sends the combined correction coefficient to the virtual pixel LED display screen;
and the virtual pixel LED display screen is in communication connection with the receiving card, and corrects and displays the lamp point brightness according to the combined correction coefficient.
According to the brightness correction method, the brightness correction device and the brightness correction system based on the virtual pixel LED display screen, provided by the invention, by combining the difference between the virtual pixel display principle and the common LED display principle, a plurality of lamp point brightness images consisting of single-color lamp points are obtained by presetting the number of skip points, and then the combined correction coefficient of the virtual pixel LED display screen is further calculated and combined by calculating the lamp point brightness average value of each lamp point brightness image and the lamp point brightness reset values of the lamp point brightness images with the same lamp point colors, so that the brightness correction of the virtual pixel LED display screen is realized, and the problem that the brightness of the virtual pixel LED display screen cannot be corrected is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flowchart illustrating a method for calibrating brightness of a virtual pixel based LED display screen according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of lamp point arrangement of a brightness correction method based on a virtual pixel LED display screen according to an embodiment of the present invention;
FIG. 3 is a schematic view (I) of a lamp point brightness image of a brightness correction method based on a virtual pixel LED display screen according to an embodiment of the present invention;
FIG. 4 is a schematic diagram (two) of a lamp point brightness image of a brightness correction method based on a virtual pixel LED display screen according to an embodiment of the present invention;
fig. 5 is a schematic view (iii) of a lamp point luminance image of a luminance correction method based on a virtual pixel LED display screen according to an embodiment of the present invention;
fig. 6 is a schematic view (four) of a lamp point luminance image of a luminance correction method based on a virtual pixel LED display screen according to an embodiment of the present invention;
fig. 7 is a schematic view (five) of a lamp point luminance image of a luminance correction method based on a virtual pixel LED display screen according to an embodiment of the present invention;
fig. 8 is a schematic view (six) of a lamp point luminance image of a luminance correction method based on a virtual pixel LED display screen according to an embodiment of the present invention;
fig. 9 is a schematic view (seven) of a lamp point luminance image of the luminance correction method based on the virtual pixel LED display screen according to the embodiment of the present invention;
fig. 10 is a schematic view (eight) of a lamp point luminance image of a luminance correction method based on a virtual pixel LED display screen according to an embodiment of the present invention;
fig. 11 is a schematic view (nine) of a lamp point luminance image of a luminance correction method based on a virtual pixel LED display screen according to an embodiment of the present invention;
fig. 12 is a schematic view (ten) of a lamp point luminance image of a luminance correction method based on a virtual pixel LED display screen according to an embodiment of the present invention;
fig. 13 is a schematic view (eleven) of a lamp point luminance image of a luminance correction method based on a virtual pixel LED display screen according to an embodiment of the present invention;
fig. 14 is a schematic view (twelve) of a lamp point luminance image of the luminance correction method based on the virtual pixel LED display screen according to the embodiment of the present invention;
FIG. 15 is a schematic diagram (thirteen) of a lamp luminance image of a luminance correction method based on a virtual pixel LED display screen according to an embodiment of the present invention;
fig. 16 is a schematic view (fourteen) of a lamp point luminance image of a luminance correction method based on a virtual pixel LED display screen according to an embodiment of the present invention;
fig. 17 is a schematic view (fifteen) of a lamp point luminance image of a luminance correction method based on a virtual pixel LED display screen according to an embodiment of the present invention;
fig. 18 is a schematic view (sixteen) of a lamp point luminance image of the luminance correction method based on the virtual pixel LED display screen according to the embodiment of the present invention;
FIG. 19 is a schematic view (seventeenth) of a lamp point brightness image of a brightness correction method based on a virtual pixel LED display screen according to an embodiment of the present invention;
fig. 20 is a schematic view (eighteen) of a lamp point luminance image of the luminance correction method based on the virtual pixel LED display screen according to the embodiment of the present invention;
fig. 21 is a schematic view (nineteenth) of a lamp point luminance image of a luminance correction method based on a virtual pixel LED display screen according to an embodiment of the present invention;
FIG. 22 is a schematic diagram (twenty) of a lamp point luminance image of a luminance correction method based on a virtual pixel LED display screen according to an embodiment of the present invention;
FIG. 23 is a flowchart illustrating a second step of a brightness correction method for a virtual pixel based LED display screen according to an embodiment of the present invention;
FIG. 24 is a flowchart illustrating a third step of a brightness correction method for a virtual pixel based LED display screen according to an embodiment of the present invention;
FIG. 25 is a structural diagram of a brightness correction device based on a virtual pixel LED display screen according to an embodiment of the present invention;
fig. 26 is a structural assembly diagram of a virtual pixel LED display system according to an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The brightness correction method based on the virtual pixel LED display screen, disclosed by the embodiment of the invention, as shown in FIG. 1, comprises the following steps:
step S10: acquiring corresponding X lamp point brightness images of the virtual pixel LED display screen according to a preset jumping point number N; all the lamp points in each lamp brightness image have the same color, and X is (N +1)2。
According to the arrangement of the dummy pixels, the predetermined number N of the skip points in the embodiment of the present invention is an odd number greater than or equal to 1, for example, N is 1,3,5, and the like. The embodiment of the invention does not limit the arrangement mode of the virtual pixels, for example, the adjacent four lamp points in two adjacent rows of lamp points in the virtual pixel LED display screen are as follows: two red light points, one blue light point and one green light point; or, two green light points, one blue light point, one red light point; or two blue light points, one green light point, one red light point.
In the embodiment of the present invention, "two green light points, one blue light point, and one red light point" are taken as examples (four light virtual), and the corresponding light points are arranged as shown in fig. 2 below.
Taking the skip point number N as 1 as an example, 4 lamp lighting images are correspondingly collected, and the lighting lamp points corresponding to each lamp lighting image correspond to fig. 3 to 6, respectively.
As shown in fig. 3, all the light points lit in the one-light-lighting-intensity image are red (R), as shown in fig. 4, all the light points lit in the one-light-lighting-intensity image are green (G), as shown in fig. 5, all the light points lit in the one-light-lighting-intensity image are green (G), and as shown in fig. 6, all the light points lit in the one-light-lighting-intensity image are blue (B).
Taking the skip point number N as 3 as an example, 16 lamp lighting images are correspondingly collected, and the lighting lamp points corresponding to each lamp lighting image correspond to fig. 7 to 22, respectively. All the light points lit in the light point luminance images shown in fig. 7, 8, 9, and 10 are red (R); all the light points lit in the light point luminance images shown in fig. 11, 12, 13, and 14 are green (G); all the light points lit in the light point luminance images shown in fig. 15, 16, 17, and 18 are also green (G); all the light points lit in the light point luminance images shown in fig. 19, 20, 21, and 22 are blue (B).
Step S20: and calculating the average value of the lamp point brightness of the corresponding lamp point brightness image according to the lamp point brightness value of the lamp point in each lamp point brightness image.
Each lamp in each lamp lighting image has a lamp brightness value, and the average lamp brightness value of the lamp brightness image is calculated as the sum of the lamp brightness values of all the lamps in the lamp brightness image and divided by the number of the lamps, for example, the lamp lighting image shown in fig. 3, in which the average lamp brightness value is the sum of the lamp brightness values of 25 red lamps divided by 25. The average value of the lamp brightness corresponding to the other lamp brightness images is calculated in sequence through the above example. The average lamp-lighting luminance values of the above four lamp-lighting luminance images are referred to as "meanL 1", "meanL 2", "meanL 3", and "meanL 4", respectively.
Step S30: selecting a reference brightness image from a plurality of lamp brightness images with the same lamp color, and calculating a corresponding brightness resetting coefficient according to the average value of the lamp brightness of the reference brightness image and the lamp brightness of the other lamp brightness images with the same lamp color.
In the lamp point arrangement shown in fig. 2, when the number of the jumping points is 1, 4 lamp point luminance images are obtained, where two of the lamp point luminance images have the same color, that is, the lamp point luminance images corresponding to fig. 4 and 5 are obtained. The step only aims at the lamp point brightness images with the same color of a plurality of lamp points, and does not process the lamp point brightness images with only one red lamp point and one blue lamp point.
If the average lamp luminance values of the two lamp luminance images of the green lamp are meanL2 and meanL3, respectively, one reference luminance image is selected from the two lamp luminance images, and the second or third lamp luminance image may be selected.
Specifically, in this embodiment, calculating the corresponding brightness resetting coefficient according to the average value of the lamp brightness of the reference brightness image and the lamp brightness images with the same other lamp colors includes:
the luminance resetting coefficient K is mean 'and mean, where mean' is the average value of the lamp luminance of the reference luminance image, and mean is the average value of the lamp luminance of the other lamp luminance images having the same lamp color as the reference luminance image.
The brightness resetting coefficient K of the third lamp lighting intensity image is meanL'/meanL is meanL2/meanL3 when the second lamp lighting intensity image is taken as the reference brightness image.
In the light point arrangement shown in fig. 2, when the number of the jumping points is 3, 16 light point luminance images are obtained, wherein 4 light points are red in color, i.e., the light point luminance images corresponding to fig. 7 to 10, 8 light points are green in color, i.e., the light point luminance images corresponding to fig. 11 to 18, and 4 light points are blue in color, i.e., the light point luminance images corresponding to fig. 19 to 22. The average values of the lamp point luminances of the 16 lamp luminance images were calculated as meanL1, meanL2, meanL3, meanL4, meanL5, meanL6, meanL7, meanL8, meanL9, meanL10, meanL11, meanL12, meanL13, meanL14, meanL15, meanL16, respectively.
In step S30, since the light point luminance images of the red, green, and blue light points are all multiple, it is necessary to select one reference luminance image of the corresponding color from the light point luminance images of the three colors, and then calculate the luminance resetting coefficients of the other light point luminance images of the light points of the same color. For example, in the case of the lamp point luminance images having the average lamp point luminance values of meanL1, meanL2, meanL3, and meanL4, respectively, the lamp point luminance image having the average lamp point luminance value of meanL1 is selected as the reference luminance image, and the luminance resetting coefficient K of the lamp point luminance image having the average lamp point luminance value of meanL2 is meanL '/meanL 1/meanL2, the luminance resetting coefficient K of the lamp point luminance image having the average lamp point luminance value of meanL3 is meanL '/meanL 1/meanL3, the luminance resetting coefficient K of the lamp point luminance image having the average lamp point luminance value of meanL4 is meanL '/meanL 1/meanL4, and the resetting coefficients of the lamp point luminance images of green and blue lamp points are not described in detail here.
Step S40: and calculating a lamp brightness reset value of the lamp in the corresponding lamp brightness image according to the brightness reset coefficient.
In the illustrated example of the present invention, the lamp luminance reset value of the lamp in the third lamp luminance image needs to be calculated, and the lamp luminance reset value of the lamp in the third lamp luminance image is calculated through step S40. The method specifically comprises the following steps:
and the lamp brightness reset value l' of the lamp in the lamp brightness image is K × l, wherein l is the lamp brightness value of a certain lamp in the lamp brightness image.
In the lamp point arrangement shown in fig. 2, when the number of the jumping points is 1, each lamp point in the third lamp luminance image is multiplied by the luminance resetting coefficient K to obtain the lamp point luminance resetting value of each lamp point in the third lamp luminance image. In the light point arrangement shown in fig. 2, when the number of the hop points is 3, the same calculation is performed.
Step S50: and calculating a combined correction coefficient of the virtual pixel LED display screen according to the lamp point brightness value or the lamp point brightness reset value of the lamp point in each lamp point brightness image.
In this embodiment, in the lamp point arrangement mode shown in fig. 2, when the number of the jumping points is 1, the calculation of the combined correction coefficient is performed by using the lamp point brightness value of each lamp point in the first lamp point brightness image, the lamp point brightness value of each lamp point in the second lamp point brightness image, the lamp point brightness reset value of each lamp point in the third lamp point brightness image, and the lamp point brightness value of each lamp point in the fourth lamp point brightness image. As shown in fig. 23, specifically:
step S501: and acquiring a lamp point brightness value or a lamp point brightness reset value of the lamp point in the lamp point brightness image.
The method comprises the steps of obtaining a lamp point brightness value of each lamp point in a first lamp point brightness image, a lamp point brightness value of each lamp point in a second lamp point brightness image, a lamp point brightness reset value of each lamp point in a third lamp point brightness image and a lamp point brightness value of each lamp point in a fourth lamp point brightness image.
Step S502: and calculating a correction coefficient corresponding to each lamp point, wherein the correction coefficient is the ratio of the target brightness value of the lamp point to the lamp point brightness value of the lamp point or the lamp point brightness reset value of the lamp point.
The lamp points in the first, second, and fourth lamp lighting images pass through: calculating a correction coefficient corresponding to the lamp point by setting the correction coefficient to the target brightness value/lamp point brightness value, the lamp point in the third lamp lighting image being obtained by: the correction coefficient is calculated corresponding to the lamp point by the target brightness value/lamp point brightness reset value.
Step S503: and generating a correction coefficient matrix as a combined correction coefficient according to the arrangement mode of the lamp points in the virtual pixel LED display screen.
According to the lamp point arrangement shown in fig. 2, the correction coefficients corresponding to the lamp point positions are combined to obtain a correction coefficient matrix, which is used as a combined correction coefficient.
Step S60: and issuing the combined correction coefficient to a receiving card corresponding to the virtual pixel LED display screen.
And acquiring a combined correction coefficient of the virtual pixel LED display screen through the steps, and sending the combined correction coefficient to a receiving card corresponding to the virtual pixel LED display screen.
Specifically, as shown in fig. 24, in step S50: calculating a combined correction coefficient of the virtual pixel LED display screen according to the lamp point brightness value or the lamp point brightness reset value of the lamp point in each lamp point brightness image, and further comprising:
step S504: and normalizing the correction coefficients to enable the values of all the correction coefficients to be more than or equal to 0 and less than or equal to 1.
The embodiment of the invention does not limit the specific normalization mode, and the min-max normalization can be adopted to normalize the correction coefficient.
The brightness correction method based on the virtual pixel LED display screen is characterized in that a plurality of lamp point brightness images composed of single-color lamp points are obtained by presetting the number of skip points according to the difference between the virtual pixel display principle and the common LED display principle, and then the combined correction coefficient of the virtual pixel LED display screen is further calculated and combined by calculating the lamp point brightness average value of each lamp point brightness image and the lamp point brightness reset values of the lamp point brightness images with the same lamp point colors, so that the brightness correction of the virtual pixel LED display screen is realized, and the problem that the brightness of the virtual pixel LED display screen cannot be corrected is solved.
Another embodiment of the present invention is a brightness correction device 10 based on a virtual pixel LED display screen, as shown in fig. 25, including: a lamp brightness image acquisition module 101, a lamp brightness average calculation module 102, a lamp brightness reset module 103, a combined correction coefficient generation module 104, and a coefficient issuing module 105, wherein:
light point brightness diagramThe image acquisition module 101 is connected with the lamp point brightness average value calculation module 102, the lamp point brightness resetting module 103 and the combined correction coefficient generation module 104, and the lamp point brightness image acquisition module 101 is used for acquiring the lamp point brightness images of the corresponding X virtual pixel LED display screens according to a preset skip point number N; all the lamp points in each lamp brightness image have the same color, and X is (N +1)2；
The lamp brightness average value calculating module 102 is connected with the lamp brightness image collecting module 101 and the lamp brightness resetting module 103, and the lamp brightness average value calculating module 102 is used for calculating the lamp brightness average value of the corresponding lamp brightness image according to the lamp brightness value of the lamp in each lamp brightness image;
the lamp brightness resetting module 103 is connected with the lamp brightness image acquisition module 101, the lamp brightness average value calculation module 102 and the combined correction coefficient generation module 104, and the lamp brightness resetting module 103 is used for selecting a reference brightness image from a plurality of lamp brightness images with the same lamp color and calculating corresponding brightness resetting coefficients according to the reference brightness image and the lamp brightness average values of other lamp brightness images with the same lamp color; and calculating a lamp brightness reset value corresponding to the lamp in the lamp brightness image according to the brightness reset coefficient;
the combined correction coefficient generation module 104 is connected with the lamp point brightness image acquisition module 101, the lamp point brightness resetting module 103 and the coefficient issuing module 105, and the combined correction coefficient generation module 104 is used for calculating a combined correction coefficient of the virtual pixel LED display screen according to the lamp point brightness value or the lamp point brightness resetting value of the lamp point in each lamp point brightness image;
and the coefficient issuing module 105 is connected with the combined correction coefficient generating module 104, and the coefficient issuing module 105 is used for issuing the combined correction coefficient to the receiving card corresponding to the virtual pixel LED display screen.
The brightness correction device of the embodiment of the invention generates and issues the combined correction coefficient of the virtual pixel LED display screen through the following steps:
step S10: and acquiring corresponding X lamp point brightness images of the virtual pixel LED display screen according to the preset jumping point number N.
Step S20: and calculating the average value of the lamp point brightness of the corresponding lamp point brightness image according to the lamp point brightness value of the lamp point in each lamp point brightness image.
Step S30: selecting a reference brightness image from a plurality of lamp brightness images with the same lamp color, and calculating a corresponding brightness resetting coefficient according to the average value of the lamp brightness of the reference brightness image and the lamp brightness of the other lamp brightness images with the same lamp color.
Step S40: and calculating a lamp brightness reset value of the lamp in the corresponding lamp brightness image according to the brightness reset coefficient.
Step S50: and calculating a combined correction coefficient of the virtual pixel LED display screen according to the lamp point brightness value or the lamp point brightness reset value of the lamp point in each lamp point brightness image.
Step S50 includes:
step S501: and acquiring a lamp point brightness value or a lamp point brightness reset value of the lamp point in the lamp point brightness image.
Step S502: and calculating a correction coefficient corresponding to each lamp point, wherein the correction coefficient is the ratio of the target brightness value of the lamp point to the lamp point brightness value of the lamp point or the lamp point brightness reset value of the lamp point.
Step S504: and normalizing the correction coefficients to enable the values of all the correction coefficients to be more than or equal to 0 and less than or equal to 1.
Step S503: and generating a correction coefficient matrix as a combined correction coefficient according to the arrangement mode of the lamp points in the virtual pixel LED display screen.
Step S60: and issuing the combined correction coefficient to a receiving card corresponding to the virtual pixel LED display screen.
For the above steps, reference may be made to the foregoing description of the embodiments of the brightness correction method, and details will not be repeated here.
The present invention further includes an embodiment of a virtual pixel LED display system, as shown in fig. 26, the virtual pixel LED display system includes the luminance correction apparatus 10 of the above embodiment, further includes a camera 20, a virtual pixel LED display screen 30 and a receiving card 40, wherein:
the camera 20 is in communication connection with the brightness correction device 10, the camera 20 is located in front of the virtual pixel LED display screen 30 and is used for shooting X lamp lighting brightness images of the virtual pixel LED display screen 30 which is used for lighting partial lamps under the preset skip point number N; all the lamp points in each lamp lighting image are the same color, and 2
X＝(N+1)；
The brightness correction device 10 is in communication connection with the camera 20 and the receiving card 40, and the brightness correction device 10 is used for acquiring an X-ray lamp lighting image; calculating the average value of the lamp point brightness of the corresponding lamp point brightness image according to the lamp point brightness value of the lamp point in each lamp point brightness image; selecting a reference brightness image from a plurality of lamp brightness images with the same lamp point color, and calculating a corresponding brightness resetting coefficient according to the average value of the lamp point brightness of the reference brightness image and the lamp brightness of the other lamp brightness images with the same lamp point color; calculating a lamp point brightness reset value of a lamp point in the corresponding lamp point brightness image according to the brightness reset coefficient; calculating a combined correction coefficient of the virtual pixel LED display screen according to the lamp point brightness value or the lamp point brightness reset value of the lamp point in each lamp point brightness image; and, the combined correction coefficient is issued to the receiving card;
the receiving card 40 is in communication connection with the brightness correction device 10 and the virtual pixel LED display screen 30, and the receiving card 40 receives the combined correction coefficient and sends the combined correction coefficient to the virtual pixel LED display screen 30;
and the virtual pixel LED display screen 30 is in communication connection with the receiving card 40, and the virtual pixel LED display screen 30 performs correction display on the brightness of the lamp points according to the combined correction coefficient.
According to the brightness correction method, the brightness correction device and the brightness correction system based on the virtual pixel LED display screen, provided by the embodiment of the invention, by combining the difference between the virtual pixel display principle and the common LED display principle, a plurality of lamp point brightness images consisting of single-color lamp points are obtained by presetting the number of jumping points, and then the combined correction coefficient of the virtual pixel LED display screen is further calculated and combined by calculating the lamp point brightness average value of each lamp point brightness image and the lamp point brightness reset values of the lamp point brightness images with the same lamp point colors, so that the brightness correction of the virtual pixel LED display screen is realized, and the problem that the brightness of the virtual pixel LED display screen cannot be corrected is solved.
The present invention has been further described with reference to specific embodiments, but it should be understood that the detailed description should not be construed as limiting the spirit and scope of the present invention, and various modifications made to the above-described embodiments by those of ordinary skill in the art after reading this specification are within the scope of the present invention.

Claims (10)

1. A brightness correction method based on a virtual pixel LED display screen is characterized by comprising the following steps:
acquiring corresponding X lamp point brightness images of the virtual pixel LED display screen according to a preset jumping point number N; all the lamp points in each lamp point brightness image have the same color, and X is (N +1)2；
Calculating a lamp point brightness average value corresponding to the lamp point brightness image according to the lamp point brightness value of the lamp point in each lamp point brightness image;
selecting a reference brightness image from a plurality of lamp brightness images with the same lamp color, and calculating a corresponding brightness resetting coefficient according to the average value of the lamp brightness of the reference brightness image and the lamp brightness of the lamp brightness images with the same other lamp colors;
calculating a lamp point brightness resetting value corresponding to a lamp point in the lamp point brightness image according to the brightness resetting coefficient;
calculating a combined correction coefficient of the virtual pixel LED display screen according to the lamp point brightness value or the lamp point brightness reset value of the lamp point in each lamp point brightness image;
and issuing the combined correction coefficient to a receiving card corresponding to the virtual pixel LED display screen.
2. The method as claimed in claim 1, wherein the calculating of the corresponding brightness resetting coefficient according to the average value of the lamp brightness of the reference brightness image and the lamp brightness images with the same other lamp colors comprises:
the luminance resetting coefficient K is mean 'and mean, where mean' is the average value of the lamp luminance of the reference luminance image, and mean is the average value of the lamp luminance of the other lamp luminance images having the same lamp color as the reference luminance image.
3. The method as claimed in claim 2, wherein calculating the lamp brightness reset value corresponding to the lamp in the lamp brightness image according to the brightness reset coefficient comprises:
and the lamp brightness reset value l' of the lamp in the lamp brightness image is K × l, wherein l is the lamp brightness value of a certain lamp in the lamp brightness image.
4. The method as claimed in claim 3, wherein calculating the combined correction factor of the virtual pixel LED display screen according to the lamp brightness value or the lamp brightness reset value of the lamp in each lamp brightness image comprises:
acquiring a lamp point brightness value or a lamp point brightness reset value of a lamp point in the lamp point brightness image;
calculating a correction coefficient corresponding to each lamp point, wherein the correction coefficient is the ratio of the target brightness value of the lamp point to the lamp point brightness value of the lamp point or the lamp point brightness reset value of the lamp point;
and generating a correction coefficient matrix as the combined correction coefficient according to the arrangement mode of the lamp points in the virtual pixel LED display screen.
5. The method as claimed in claim 4, wherein the calculating of the combined correction factor of the virtual pixel LED display screen according to the lamp brightness value or the lamp brightness reset value of the lamp in each lamp brightness image further comprises:
and normalizing the correction coefficients to enable the values of all the correction coefficients to be more than or equal to 0 and less than or equal to 1.
6. The method of claim 5, wherein the correction factor is normalized using min-max normalization.
7. The method as claimed in any one of claims 1 to 6, wherein the adjacent four light points in the two adjacent rows of light points in the virtual pixel LED display screen are: two red light points, one blue light point and one green light point; or, two green light points, one blue light point, one red light point; or two blue light points, one green light point, one red light point.
8. The method as claimed in claim 7, wherein the predetermined number of skip points N is an odd number greater than or equal to 1.
9. A brightness correction device based on virtual pixel LED display screen is characterized by comprising: the device comprises a lamp point brightness image acquisition module, a lamp point brightness average value calculation module, a lamp point brightness resetting module, a combined correction coefficient generation module and a coefficient issuing module, wherein:
the lamp point brightness image acquisition module is connected with the lamp point brightness average value calculation module, the lamp point brightness resetting module and the combined correction coefficient generation module, and is used for acquiring the lamp point brightness images of the corresponding X virtual pixel LED display screens according to a preset jumping point number N; all the lamp points in each lamp point brightness image have the same color, and X is (N +1)2；
The lamp point brightness average value calculating module is connected with the lamp point brightness image collecting module and the lamp point brightness resetting module and is used for calculating a lamp point brightness average value corresponding to the lamp point brightness image according to the lamp point brightness value of the lamp point in each lamp point brightness image;
the lamp point brightness resetting module is connected with the lamp point brightness image acquisition module, the lamp point brightness average value calculation module and the combined correction coefficient generation module, and is used for selecting a reference brightness image from a plurality of lamp point brightness images with the same lamp point color and calculating a corresponding brightness resetting coefficient according to the reference brightness image and the lamp point brightness average values of the other lamp point brightness images with the same lamp point color; and calculating a lamp brightness reset value corresponding to the lamp in the lamp brightness image according to the brightness reset coefficient;
the combined correction coefficient generation module is connected with the lamp point brightness image acquisition module, the lamp point brightness resetting module and the coefficient issuing module, and is used for calculating a combined correction coefficient of the virtual pixel LED display screen according to the lamp point brightness value or the lamp point brightness resetting value of the lamp points in each lamp point brightness image;
and the coefficient issuing module is connected with the combined correction coefficient generating module and is used for issuing the combined correction coefficient to a receiving card corresponding to the virtual pixel LED display screen.
10. A virtual pixel LED display system comprising the luminance correction device of claim 9, further comprising a camera and a virtual pixel LED display screen and receiving card, wherein:
the camera is in communication connection with the brightness correction device, is positioned in front of the virtual pixel LED display screen and is used for shooting X lamp lighting images of the virtual pixel LED display screen, which are used for lighting partial lamps under a preset jump point number N; all the lamp points in each lamp point brightness image have the same color, and X is (N +1)2；
The brightness correction device is in communication connection with the camera and the receiving card and is used for acquiring an image of the lighting degree of the X lamps; calculating a lamp point brightness average value corresponding to the lamp point brightness image according to the lamp point brightness value of the lamp point in each lamp point brightness image; selecting a reference brightness image from a plurality of lamp brightness images with the same lamp color, and calculating a corresponding brightness resetting coefficient according to the average value of the lamp brightness of the reference brightness image and the lamp brightness of the lamp brightness images with the same other lamp colors; calculating a lamp point brightness resetting value corresponding to a lamp point in the lamp point brightness image according to the brightness resetting coefficient; calculating a combined correction coefficient of the virtual pixel LED display screen according to the lamp point brightness value or the lamp point brightness reset value of the lamp point in each lamp point brightness image; and issuing the combined correction coefficient to the receiving card;
the receiving card is in communication connection with the brightness correction device and the virtual pixel LED display screen, and receives the combined correction coefficient and sends the combined correction coefficient to the virtual pixel LED display screen;
and the virtual pixel LED display screen is in communication connection with the receiving card, and corrects and displays the brightness of the lamp points according to the combined correction coefficient.
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