CN113870773A - Brightness compensation method, brightness compensation device and brightness compensation system of LED display screen - Google Patents
Brightness compensation method, brightness compensation device and brightness compensation system of LED display screen Download PDFInfo
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- CN113870773A CN113870773A CN202111273169.0A CN202111273169A CN113870773A CN 113870773 A CN113870773 A CN 113870773A CN 202111273169 A CN202111273169 A CN 202111273169A CN 113870773 A CN113870773 A CN 113870773A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- G—PHYSICS
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- 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 compensation method, a brightness compensation device and a brightness compensation system of an LED display screen, wherein the method comprises the steps of acquiring a preset first table and a preset second table; acquiring a wavelength measurement value when the LED display screen displays; inquiring the light transmittance and the sensitivity corresponding to the wavelength measurement value in the first table and the second table, and inquiring the target light transmittance corresponding to the wavelength measurement value in a preset standard colorimetric system; calculating a compensation coefficient corresponding to the wavelength measurement value; acquiring a first photometric picture for shooting an LED display screen, and acquiring the actual brightness value of each lamp point from the first photometric picture; and calculating the brightness compensation value of the corresponding lamp point according to the compensation coefficient and the actual brightness value of the lamp point. The invention solves the problem that the correction effect is influenced by the brightness difference caused by the optical filter and the photosensitive chip when the LED display screen is corrected, thereby realizing the brightness compensation of all lamp points of the LED display screen and ensuring the good correction effect.
Description
Technical Field
The invention relates to the technical field of LED screen correction, in particular to a brightness compensation method, a brightness compensation device and a brightness compensation system of an LED display screen.
Background
In the existing process of correcting the brightness of the LED display screen, a camera is used for shooting, wherein the camera includes an optical filter and a photosensitive chip (including but not limited to CMOS and CCD), and a relationship formed among the optical filter and the photosensitive chip can obtain a target brightness (a brightness value needs to be reflected by a light transmittance of a standard curve CIE1931 XYZ), but in the actual using process, due to the problem of the processing technique of the optical filter, there is a problem that there is a certain difference between the obtained actual brightness and the required target brightness, and even if there is no problem in the processing technique, there is a problem that there is a certain difference between the obtained actual brightness and the required target brightness when the optical filter and the photosensitive chip are used together, thus, for the existing problem, for the correction of the current LED display screen, the correction effect is directly affected.
Therefore, there is a need to find a new technical solution to solve the above problems.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a brightness compensation method, a brightness compensation device and a brightness compensation system of an LED display screen.
The invention discloses a brightness compensation method of an LED display screen, which comprises the following steps:
acquiring a preset first table and a preset second table; the first table is the corresponding relation between the light transmittance and the wavelength value of the optical filter under different wavelengths; the second table is the corresponding relation between the sensitivity of the photosensitive chip under different wavelengths and the wavelength value;
acquiring a wavelength measurement value when the LED display screen displays;
inquiring the light transmittance and the sensitivity corresponding to the wavelength measurement value in the first table and the second table, and inquiring the target light transmittance corresponding to the wavelength measurement value in a preset standard colorimetric system;
calculating a compensation coefficient corresponding to the wavelength measurement value according to the wavelength measurement value, the corresponding light transmittance, the sensitivity and the target light transmittance;
acquiring a first photometric picture for shooting an LED display screen, and acquiring the actual brightness value of each lamp point from the first photometric picture;
and calculating the brightness compensation value of the corresponding lamp point according to the compensation coefficient and the actual brightness value of the lamp point.
Further, the method also comprises the following steps:
acquiring a target brightness value of the LED display screen;
calculating a correction coefficient of each lamp point according to the target brightness value and the brightness compensation value of each lamp point;
and according to the brightness compensation value and the correction coefficient, performing uniformity correction on the LED display screen.
Further, the obtaining of the preset first table includes:
acquiring an initial brightness value of preset measuring light; the measuring light is visible light with a preset wavelength range;
acquiring a brightness measurement value of the measurement light passing through the optical filter;
and calculating the light transmittance of the optical filter under different wavelengths according to the brightness measured value and the initial brightness value, and storing the correspondence between the wavelength value and the light transmittance as a first table.
Further, the obtaining of the preset second table includes:
acquiring a second photometric picture of the measurement light shot by the second camera; the second camera is provided with a photosensitive chip and is not provided with an optical filter;
extracting pixel brightness values in a preset area in a second photometric picture, and calculating an average brightness value;
and calculating the sensitivities of the photosensitive chip under different wavelengths through the average brightness value and the initial brightness value, and storing the correspondence between the wavelength value and the sensitivity as a second table.
Further, calculating the transmittance of the filter at different wavelengths according to the brightness measurement value and the initial brightness value, including:
the transmittance of the filter at different wavelengths was calculated by 1- (initial luminance value-luminance measurement value)/initial luminance value-transmittance.
Further, calculating the sensitivities of the photosensitive chip at different wavelengths through the average brightness value and the initial brightness value includes:
the sensitivity of the photosensitive chip at different wavelengths is calculated by 1- (initial brightness value-average brightness value)/initial brightness value-sensitivity.
Further, calculating a compensation coefficient corresponding to the wavelength measurement value according to the wavelength measurement value and the corresponding transmittance, sensitivity and target transmittance, including:
calculating a compensation coefficient corresponding to the wavelength measurement value by K-K3/(K1-K2); where K1 is the transmittance corresponding to the wavelength measurement, K2 is the sensitivity corresponding to the wavelength measurement, and K3 is the target transmittance corresponding to the wavelength measurement.
Further, calculating a brightness compensation value corresponding to the lamp point according to the compensation coefficient and the actual brightness value of the lamp point, including:
and calculating the brightness compensation value corresponding to each lamp point according to the brightness compensation value, namely the compensation coefficient.
The invention also comprises a brightness compensation device of the LED display screen, wherein the brightness compensation device comprises a table acquisition module, a compensation coefficient calculation module and a brightness compensation calculation module, wherein:
the table acquisition module is connected with the compensation coefficient calculation module and is used for acquiring a preset first table and a preset second table; the first table is the corresponding relation between the light transmittance and the wavelength value of the optical filter under different wavelengths; the second table is the corresponding relation between the sensitivity of the photosensitive chip under different wavelengths and the wavelength value;
the compensation coefficient calculation module is connected with the table acquisition module and the brightness compensation calculation module and is used for acquiring a wavelength measurement value when the LED display screen displays; inquiring the light transmittance and the sensitivity corresponding to the wavelength measurement value in the first table and the second table, and inquiring the target light transmittance corresponding to the wavelength measurement value in a preset standard colorimetric system; calculating a compensation coefficient corresponding to the wavelength measurement value through the wavelength measurement value and the corresponding light transmittance, sensitivity and target light transmittance;
the brightness compensation calculation module is connected with the compensation coefficient calculation module and is used for acquiring a first photometric picture for shooting the LED display screen and acquiring the actual brightness value of each lamp point from the first photometric picture; and calculating the brightness compensation value of the corresponding lamp point through the compensation coefficient and the actual brightness value of the lamp point.
The invention also comprises a brightness compensation system of the LED display screen, wherein the brightness compensation system comprises a brightness compensation device, a visible light source, a brightness colorimeter, a first camera, a second camera and the LED display screen, and the brightness compensation system also comprises a visible light source, a brightness colorimeter, a first camera, a second camera and the LED display screen, wherein:
the visible light source is connected with the brightness compensation device; the visible light source is used for emitting measuring light, and the measuring light is visible light in a preset wavelength range;
the luminance colorimeter is connected with the luminance compensation device; the luminance and chrominance meter is used for measuring a luminance measured value of the measuring light after passing through the optical filter and measuring the luminance measured value to obtain a wavelength measured value when the LED display screen displays the luminance measured value;
the first camera is connected with the brightness compensation device and is provided with a photosensitive chip and an optical filter; the first camera is used for shooting the LED display screen to obtain a first photometric picture;
the second camera is connected with the brightness compensation device and is provided with a photosensitive chip and no optical filter; the second camera is used for shooting the measuring light to obtain a second photometric picture;
the brightness compensation device is connected with the visible light source, the luminance colorimeter, the first camera, the second camera and the LED display screen; the brightness compensation device is used for controlling the visible light source to emit measuring light, acquiring an initial brightness value of the measuring light, acquiring a brightness measured value, calculating light transmittance of the optical filter under different wavelengths according to the brightness measured value and the initial brightness value, and correspondingly storing the wavelength value and the light transmittance as a first table; and acquiring a second photometric picture; extracting pixel brightness values in a preset area in a second photometric picture, and calculating an average brightness value; calculating the sensitivities of the photosensitive chip under different wavelengths through the average brightness value and the initial brightness value, and correspondingly storing the wavelength values and the sensitivities as a second table; acquiring a wavelength measurement value, inquiring the light transmittance and the sensitivity corresponding to the wavelength measurement value in a first table and a second table, and inquiring a target light transmittance corresponding to the wavelength measurement value in a preset standard colorimetric system; calculating a compensation coefficient corresponding to the wavelength measurement value according to the wavelength measurement value, the corresponding light transmittance, the sensitivity and the target light transmittance; acquiring a first photometric picture, and acquiring the actual brightness value of each lamp point from the first photometric picture; calculating a brightness compensation value corresponding to the lamp point according to the compensation coefficient and the actual brightness value of the lamp point;
and the LED display screen is connected with the brightness compensation device and used for displaying when the luminance colorimeter measures and the first camera shoots and acquiring and displaying the brightness compensation value.
According to the brightness compensation method, the brightness compensation device and the brightness compensation system of the LED display screen, the light transmittance of the optical filter and the sensitivity of the photosensitive chip to light are calculated in advance, when the brightness of the LED display screen needs to be compensated, the compensation coefficient corresponding to the wavelength measurement value is calculated through the light transmittance, the sensitivity and the target light transmittance, the problem that the correction effect is influenced due to brightness difference caused by the optical filter and the photosensitive chip when the LED display screen is corrected is solved, each lamp point in the LED display screen determines the corresponding brightness compensation value through the compensation coefficient, therefore, the brightness compensation of all lamp points of the LED display screen is achieved, and the good correction effect of the LED display screen is further guaranteed.
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 first step of a brightness compensation method for an LED display panel according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a step of a brightness compensation method for an LED display panel according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a trend of light transmittance changes of a first table in a brightness compensation method of an LED display panel according to an embodiment of the present invention;
FIG. 4 is a flowchart (III) illustrating steps of a brightness compensation method for an LED display panel according to an embodiment of the present invention;
FIG. 5 is a graph illustrating a sensitivity variation trend of a second table in a luminance compensation method for an LED display panel according to an embodiment of the present invention;
FIG. 6 is a target transmittance trend chart of a standard chromaticity system in the luminance compensation method of the LED display screen according to the embodiment of the present invention;
FIG. 7 is a flowchart illustrating a brightness compensation method for an LED display screen according to another embodiment of the present invention;
FIG. 8 is a structural diagram of a brightness compensation device of an LED display panel according to an embodiment of the present invention;
fig. 9 is a structural diagram of a brightness compensation system of an LED display panel according to an embodiment of the present 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 compensation method of the LED display screen of the embodiment of the invention, as shown in figure 1, comprises the following steps:
step S10: acquiring a preset first table and a preset second table; the first table is the corresponding relation between the light transmittance and the wavelength value of the optical filter under different wavelengths; the second table is the corresponding relationship between the sensitivity of the photosensitive chip under different wavelengths and the wavelength values.
Specifically, the embodiment of the present invention may obtain the first table and the second table in the following manner.
As shown in fig. 2, acquiring the preset first table includes:
step S101: acquiring an initial brightness value of preset measuring light; the measuring light is visible light with a preset wavelength range.
The measuring light can be emitted by using the existing visible light source product, and the embodiment is not particularly limited. The initial brightness value of the measuring light of the present embodiment is a preset fixed value, preferably 400nit, and the measuring light is presented according to the preset wavelength range under the condition that the initial brightness value is not changed. The measuring light of the embodiment is uniform visible light.
Step S102: and acquiring a brightness measurement value of the measurement light passing through the filter.
The present embodiment may measure the luminance measurement value of the measurement light after passing through the optical filter by using a light colorimeter, the present embodiment does not limit the product model of the light colorimeter, and may be selected as a CS2000 spectral radiance luminance meter, and three luminance measurement values under X, Y, Z optical filters may be measured respectively at each wavelength value.
Step S103: and calculating the light transmittance of the optical filter under different wavelengths according to the brightness measured value and the initial brightness value, and storing the correspondence between the wavelength value and the light transmittance as a first table.
Specifically, the transmittance of the filter at different wavelengths can be calculated by "1- (initial luminance value-luminance measurement value)/initial luminance value ═ transmittance".
The first table is a table formed by a fixed initial brightness value, different wavelength values and transmittance, because the first table is a table in which a plurality of brightness measurement values are measured within a preset wavelength range under the fixed initial brightness value to calculate the transmittance of the optical filter under each wavelength value. As shown in fig. 3, which is a trend graph formed by data in the first table obtained by measuring an initial brightness value equal to 400nit by a CS2000 spectroradiometer and calculating through the above steps, wherein the abscissa is a wavelength value and the ordinate is a percentage value of transmittance.
As shown in fig. 4, acquiring the preset second table includes:
step S104: acquiring a second photometric picture of the measurement light shot by the second camera; the second camera is a camera which is provided with a photosensitive chip and is not provided with an optical filter.
The measurement light in this step is the same measurement light as the measurement light in step S101, and the measurement light is photographed by the second camera, and since only the light sensing chip is mounted in the second camera and no optical filter is mounted in the second camera, the second photometric picture can reflect the sensitivity of the light sensing chip to the measurement light.
Step S105: and extracting the pixel brightness value in a preset area in the second photometric picture, and calculating the average brightness value.
The second photometric picture has a certain size, and considering that a camera aperture and a background pixel may affect the brightness extraction when the second camera takes a picture, in this step, the average brightness is calculated by extracting the brightness value of the pixel in the preset region, preferably, the preset region in this embodiment is located at the center of the second photometric picture, and the area of the preset region is selected to be 1/20 of the total area of the second photometric picture. And a plurality of image pixel points exist in the preset area, each image pixel point has a brightness value, and the average brightness value of the step is calculated in a mode of summing and calculating the average value.
Step S106: and calculating the sensitivities of the photosensitive chip under different wavelengths through the average brightness value and the initial brightness value, and storing the correspondence between the wavelength value and the sensitivity as a second table.
Specifically, the sensitivities of the photosensitive chips at different wavelengths are calculated by "1- (initial luminance value-average luminance value)/initial luminance value ═ sensitivity".
The second table of this embodiment is a plurality of average brightness values measured in a predetermined wavelength range under a fixed initial brightness value, so as to calculate the sensitivities of the photo sensor chip at different wavelengths. Therefore, the second table is a table formed by a fixed initial brightness value, different wavelength values and sensitivities. As shown in fig. 5, the initial brightness value is equal to 400nit, and a trend graph is formed by the data in the second table calculated through the above steps, wherein the abscissa is the wavelength value, the ordinate is the value of the sensitivity, and the value range of the sensitivity is 0 to 1.
After the first table and the second table are determined, the lighting brightness of the LED display screen is processed as shown in step S20 and the following steps.
Step S20: and acquiring a wavelength measured value when the LED display screen displays.
When the LED display screen displays light with different wavelengths, corresponding wavelength measurement values need to be obtained in the step, and in the step, lamp points in the LED display screen can be controlled by software of an upper computer to display the light with different wavelengths or RGB lamp points in the LED display screen are controlled to be lightened. The wavelength measurement may be measured by a probe of a light colorimeter.
Step S30: the transmittance and the sensitivity corresponding to the wavelength measurement value are inquired in the first table and the second table, and the target transmittance corresponding to the wavelength measurement value is inquired in a preset standard colorimetric system.
After the wavelength measurement value displayed by the LED display screen is obtained, the wavelength measurement value is respectively corresponding to the first table and the second table, and the corresponding light transmittance and the sensitivity are respectively found out. And inquiring the target light transmittance corresponding to the wavelength measurement value in a preset standard colorimetric system. The CIE1931XYZ standard chromaticity system commonly used by those skilled in the art is selected for this embodiment.
In this embodiment, a target transmittance is queried from the standard chromaticity system, and a preset wavelength range of the measurement light is reversely selected based on the target transmittance, as shown in fig. 6, the preset wavelength range of the measurement light is 390nm to 780nm, which is a corresponding relationship between different wavelength values and the target transmittance in the CIE1931XYZ standard chromaticity system, and the wavelength range of the abscissa is 390nm to 780nm, so that the preset wavelength range of the measurement light in the embodiment of the present invention may be set to 390nm to 780nm, or 380nm to 800nm, so that the abscissa value ranges of the first table and the second table in this step correspond to the abscissa value range of the standard chromaticity system.
Step S40: and calculating a compensation coefficient corresponding to the wavelength measurement value through the wavelength measurement value and the corresponding light transmittance, sensitivity and target light transmittance.
Specifically, the calculation method of the compensation coefficient is as follows:
calculating a compensation coefficient corresponding to the wavelength measurement value by K-K3/(K1-K2); where K1 is the transmittance corresponding to the wavelength measurement, K2 is the sensitivity corresponding to the wavelength measurement, and K3 is the target transmittance corresponding to the wavelength measurement. The compensation coefficient of this embodiment is calculated by deriving from the relationship of m × K1 × K2 × K3 × m, where m represents the brightness value of the lamp point.
Step S50: the method comprises the steps of obtaining a first photometric picture for shooting an LED display screen, and obtaining the actual brightness value of each lamp point from the first photometric picture.
The first photometric picture acquired in this step is taken by the first camera equipped with the light-sensitive chip and the optical filter, so that the first photometric picture not only reflects the light transmittance of the optical filter, but also reflects the sensitivity of the light-sensitive chip. An actual brightness value of each lamp point in the drawing, which needs brightness compensation, is obtained from the first photometric picture, and step S60 is performed.
Step S60: and calculating the brightness compensation value of the corresponding lamp point according to the compensation coefficient and the actual brightness value of the lamp point.
In the step, the brightness compensation value corresponding to each lamp point is calculated through the brightness compensation value which is the compensation coefficient.
According to the brightness compensation method of the LED display screen, the light transmittance of the optical filter and the sensitivity of the photosensitive chip to light are calculated in advance, when the brightness of the LED display screen needs to be compensated, the compensation coefficient corresponding to the wavelength measurement value is calculated through the light transmittance, the sensitivity and the target light transmittance, the problem that the correction effect is influenced due to brightness difference caused by the optical filter and the photosensitive chip when the LED display screen is corrected is solved, each lamp point in the LED display screen determines the corresponding brightness compensation value through the compensation coefficient, therefore, the brightness compensation of all the lamp points of the LED display screen is achieved, and the good correction effect of the LED display screen is further guaranteed.
After the above embodiment obtains the luminance compensation value of each lamp, the embodiment performs the correction of uniformization of the luminance of the lamp again, as shown in fig. 7, the embodiment of the present invention further includes the following steps based on the previous embodiment:
s70: and acquiring a target brightness value of the LED display screen.
The target brightness value of this embodiment is set by a compensation brightness value calculated by a person skilled in the art according to the method of the foregoing embodiment, and the specific value is not limited in this embodiment.
S80: and calculating a correction coefficient of each lamp point through the target brightness value and the brightness compensation value of each lamp point.
And calculating a correction coefficient corresponding to each lamp point according to the correction coefficient which is the target brightness value/brightness compensation value.
S90: and according to the brightness compensation value and the correction coefficient, performing uniformity correction on the LED display screen.
The brightness of the lamp point in the LED display screen is adjusted again through the embodiment, so that the brightness of the lamp point is more uniform, and the display effect of the LED display screen is better.
As shown in fig. 8, the present invention further includes a luminance compensation apparatus of an LED display panel, the luminance compensation apparatus 10 includes a table obtaining module 101, a compensation coefficient calculating module 102, and a luminance compensation calculating module 103, wherein:
the table obtaining module 101 is connected to the compensation coefficient calculating module 102, and the table obtaining module 101 is configured to obtain a preset first table and a preset second table; the first table is the corresponding relation between the light transmittance and the wavelength value of the optical filter under different wavelengths; the second table is the corresponding relation between the sensitivity of the photosensitive chip under different wavelengths and the wavelength value;
the compensation coefficient calculation module 102 is connected with the table acquisition module 101 and the brightness compensation calculation module 103, and the compensation coefficient calculation module 102 is used for acquiring a wavelength measurement value when the LED display screen displays; inquiring the light transmittance and the sensitivity corresponding to the wavelength measurement value in the first table and the second table, and inquiring the target light transmittance corresponding to the wavelength measurement value in a preset standard colorimetric system; calculating a compensation coefficient corresponding to the wavelength measurement value through the wavelength measurement value and the corresponding light transmittance, sensitivity and target light transmittance;
the brightness compensation calculation module 103 is connected with the compensation coefficient calculation module 102, and the brightness compensation calculation module 103 is configured to obtain a first photometric picture for shooting the LED display screen, and obtain an actual brightness value of each light point from the first photometric picture; the first photometric picture is obtained by shooting with a first camera provided with a photosensitive chip and an optical filter; and calculating the brightness compensation value of the corresponding lamp point through the compensation coefficient and the actual brightness value of the lamp point.
Specifically, the table acquiring module 101 of the present embodiment acquires the first table and the second table by the following steps:
step S101: acquiring an initial brightness value of preset measuring light; the measuring light is visible light with a preset wavelength range.
Step S102: and acquiring a brightness measurement value of the measurement light passing through the filter.
Step S103: and calculating the light transmittance of the optical filter under different wavelengths according to the brightness measured value and the initial brightness value, and storing the correspondence between the wavelength value and the light transmittance as a first table.
Step S104: acquiring a second photometric picture of the measurement light shot by the second camera; the second camera is a camera which is provided with a photosensitive chip and is not provided with an optical filter.
Step S105: and extracting the pixel brightness value in a preset area in the second photometric picture, and calculating the average brightness value.
Step S106: and calculating the sensitivities of the photosensitive chip under different wavelengths through the average brightness value and the initial brightness value, and storing the correspondence between the wavelength value and the sensitivity as a second table.
Specifically, the brightness compensation device 10 of the LED display screen according to the embodiment of the present invention implements brightness compensation of the LED display screen by the following methods:
step S10: and acquiring a preset first table and a preset second table.
Step S20: and acquiring a wavelength measured value when the LED display screen displays.
Step S30: the transmittance and the sensitivity corresponding to the wavelength measurement value are inquired in the first table and the second table, and the target transmittance corresponding to the wavelength measurement value is inquired in a preset standard colorimetric system.
Step S40: and calculating a compensation coefficient corresponding to the wavelength measurement value through the wavelength measurement value and the corresponding light transmittance, sensitivity and target light transmittance.
Step S50: acquiring a first photometric picture for shooting an LED display screen, and acquiring the actual brightness value of each lamp point from the first photometric picture;
step S60: and calculating the brightness compensation value of the corresponding lamp point according to the compensation coefficient and the actual brightness value of the lamp point.
The implementation of the above steps can refer to the related description of the brightness compensation method for the LED display screen in the foregoing embodiment, and will not be described herein again.
As shown in fig. 9, the embodiment of the present invention further includes a brightness compensation system of an LED display screen, where the brightness compensation system includes the brightness compensation device 10 of the above embodiment, and further includes a visible light source 20, a luminance colorimeter 30, a first camera 40, a second camera 50, and an LED display screen 60, where:
a visible light source 20 connected to the brightness compensation device 10; the visible light source 20 is configured to emit measurement light, where the measurement light is visible light in a preset wavelength range;
a luminance colorimeter 30 connected to the luminance compensation device 10; the luminance colorimeter 30 is used for measuring a luminance measurement value after the measurement light passes through the optical filter, and is used for measuring a wavelength measurement value when the LED display screen 60 displays the luminance measurement value;
the first camera 40 is connected with the brightness compensation device 10, and the first camera 40 is a camera provided with a photosensitive chip and an optical filter; the first camera 40 is used for shooting the LED display screen 60 to obtain a first photometric picture;
a second camera 50 connected to the brightness compensation device 10, wherein the second camera 50 is a camera with a light sensing chip and no optical filter; the second camera 50 is configured to take a second photometric picture of the measurement light;
the brightness compensation device 10 is connected with the visible light source 20, the luminance colorimeter 30, the first camera 40, the second camera 50 and the LED display screen 60; the brightness compensation device 10 is used for controlling the visible light source 20 to emit the measuring light, obtaining an initial brightness value of the measuring light, obtaining a brightness measurement value, calculating the light transmittance of the optical filter under different wavelengths according to the brightness measurement value and the initial brightness value, and storing the wavelength value and the light transmittance as a first table; and acquiring a second photometric picture; extracting pixel brightness values in a preset area in a second photometric picture, and calculating an average brightness value; calculating the sensitivities of the photosensitive chip under different wavelengths through the average brightness value and the initial brightness value, and correspondingly storing the wavelength values and the sensitivities as a second table; acquiring a wavelength measurement value, inquiring the light transmittance and the sensitivity corresponding to the wavelength measurement value in a first table and a second table, and inquiring a target light transmittance corresponding to the wavelength measurement value in a preset standard colorimetric system; calculating a compensation coefficient corresponding to the wavelength measurement value according to the wavelength measurement value, the corresponding light transmittance, the sensitivity and the target light transmittance; acquiring a first photometric picture, and acquiring the actual brightness value of each lamp point from the first photometric picture; calculating a brightness compensation value corresponding to the lamp point according to the compensation coefficient and the actual brightness value of the lamp point;
and an LED display screen 60 connected to the luminance compensation device 10, wherein the LED display screen 60 is used for displaying when the luminance colorimeter 30 measures and the first camera 40 photographs, and for acquiring and displaying the luminance compensation value.
Specifically, the brightness compensation device 10 of the embodiment of the present invention is further configured to obtain a target brightness value of the LED display screen; calculating a correction coefficient of each lamp point according to the target brightness value and the brightness compensation value of each lamp point; and according to the brightness compensation value and the correction coefficient, performing uniformity correction on the LED display screen 60.
According to the brightness compensation method, the brightness compensation device and the brightness compensation system of the LED display screen, the light transmittance of the optical filter and the sensitivity of the photosensitive chip to light are calculated in advance, when the brightness of the LED display screen needs to be compensated, the compensation coefficient corresponding to the wavelength measurement value is calculated through the light transmittance, the sensitivity and the target light transmittance, the problem that the correction effect is influenced due to brightness difference caused by the optical filter and the photosensitive chip when the LED display screen is corrected is solved, each lamp point in the LED display screen determines the corresponding brightness compensation value through the compensation coefficient, therefore, the brightness compensation of all the lamp points of the LED display screen is achieved, and the good correction effect of the LED display screen is further guaranteed.
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 compensation method of an LED display screen is characterized by comprising the following steps:
acquiring a preset first table and a preset second table; the first table is the corresponding relation between the light transmittance and the wavelength value of the optical filter under different wavelengths; the second table is the corresponding relation between the sensitivity of the photosensitive chip under different wavelengths and the wavelength value;
acquiring a wavelength measurement value when the LED display screen displays;
inquiring the light transmittance and the sensitivity corresponding to the wavelength measurement value in the first table and the second table, and inquiring the target light transmittance corresponding to the wavelength measurement value in a preset standard colorimetric system;
calculating a compensation coefficient corresponding to the wavelength measurement value according to the wavelength measurement value, the corresponding light transmittance, the sensitivity and the target light transmittance;
acquiring a first photometric picture for shooting an LED display screen, and acquiring the actual brightness value of each lamp point from the first photometric picture;
and calculating the brightness compensation value of the corresponding lamp point according to the compensation coefficient and the actual brightness value of the lamp point.
2. The method of claim 1, further comprising:
acquiring a target brightness value of the LED display screen;
calculating a correction coefficient of each lamp point according to the target brightness value and the brightness compensation value of each lamp point;
and carrying out uniformity correction on the LED display screen according to the brightness compensation value and the correction coefficient.
3. The method as claimed in claim 1, wherein the obtaining the preset first table comprises:
acquiring an initial brightness value of preset measuring light; the measuring light is visible light with a preset wavelength range;
acquiring a brightness measurement value of the measuring light passing through the optical filter;
and calculating the light transmittance of the optical filter under different wavelengths according to the brightness measured value and the initial brightness value, and storing the wavelength value and the light transmittance as a first table correspondingly.
4. The method as claimed in claim 3, wherein the obtaining the predetermined second table comprises:
acquiring a second photometric picture of the measuring light shot by a second camera; the second camera is provided with a photosensitive chip and is not provided with an optical filter;
extracting pixel brightness values in a preset area in the second photometric picture, and calculating an average brightness value;
and calculating the sensitivities of the photosensitive chip under different wavelengths according to the average brightness value and the initial brightness value, and storing the correspondence between the wavelength value and the sensitivity as a second table.
5. The method of claim 4, wherein calculating the transmittance of the filter at different wavelengths according to the brightness measurement and the initial brightness value comprises:
the transmittance of the filter at different wavelengths was calculated by 1- (initial luminance value-luminance measurement value)/initial luminance value-transmittance.
6. The method of claim 4, wherein calculating the sensitivities of the light-sensing chips at different wavelengths according to the average brightness value and the initial brightness value comprises:
the sensitivity of the photosensitive chip at different wavelengths is calculated by 1- (initial brightness value-average brightness value)/initial brightness value-sensitivity.
7. The method as claimed in claim 4, wherein calculating the compensation coefficient corresponding to the wavelength measurement value by the wavelength measurement value and the corresponding transmittance, sensitivity and target transmittance comprises:
calculating a compensation coefficient corresponding to the wavelength measurement value by K-K3/(K1-K2); where K1 is the transmittance corresponding to the wavelength measurement, K2 is the sensitivity corresponding to the wavelength measurement, and K3 is the target transmittance corresponding to the wavelength measurement.
8. The method of claim 4, wherein calculating the brightness compensation value for the corresponding lamp point according to the compensation factor and the actual brightness value of the lamp point comprises:
and calculating the brightness compensation value corresponding to each lamp point according to the brightness compensation value, namely the compensation coefficient.
9. The brightness compensation device of the LED display screen is characterized by comprising a table acquisition module, a compensation coefficient calculation module and a brightness compensation calculation module, wherein:
the table acquisition module is connected with the compensation coefficient calculation module and is used for acquiring a preset first table and a preset second table; the first table is the corresponding relation between the light transmittance and the wavelength value of the optical filter under different wavelengths; the second table is the corresponding relation between the sensitivity of the photosensitive chip under different wavelengths and the wavelength value;
the compensation coefficient calculation module is connected with the table acquisition module and the brightness compensation calculation module, and is used for acquiring a wavelength measurement value when an LED display screen displays; inquiring the light transmittance and the sensitivity corresponding to the wavelength measurement value in the first table and the second table, and inquiring the target light transmittance corresponding to the wavelength measurement value in a preset standard colorimetric system; calculating a compensation coefficient corresponding to the wavelength measurement value according to the wavelength measurement value, the corresponding light transmittance, the sensitivity and the target light transmittance;
the brightness compensation calculation module is connected with the compensation coefficient calculation module and is used for acquiring a first photometric picture for shooting the LED display screen and acquiring the actual brightness value of each lamp point from the first photometric picture; and calculating a brightness compensation value corresponding to the lamp point according to the compensation coefficient and the actual brightness value of the lamp point.
10. A brightness compensation system of an LED display screen, comprising the brightness compensation device of claim 9, further comprising a visible light source, a luminance colorimeter, a first camera, a second camera, and an LED display screen, wherein:
the visible light source is connected with the brightness compensation device; the visible light source is used for emitting measuring light, and the measuring light is visible light in a preset wavelength range;
the brightness colorimeter is connected with the brightness compensation device; the luminance colorimeter is used for measuring a luminance measured value of the measuring light after passing through the optical filter and is used for measuring when the LED display screen displays to obtain a wavelength measured value;
the first camera is connected with the brightness compensation device and is provided with a photosensitive chip and an optical filter; the first camera is used for shooting the LED display screen to obtain a first photometric picture;
the second camera is connected with the brightness compensation device, and the second camera is provided with a photosensitive chip and is not provided with an optical filter; the second camera is used for shooting the measuring light to obtain a second photometric picture;
the brightness compensation device is connected with the visible light source, the luminance colorimeter, the first camera, the second camera and the LED display screen; the brightness compensation device is used for controlling the visible light source to emit measuring light, acquiring an initial brightness value of the measuring light, acquiring a brightness measured value, calculating light transmittance of the optical filter under different wavelengths according to the brightness measured value and the initial brightness value, and storing the wavelength value and the light transmittance as a first table correspondingly; and acquiring the second photometric picture; extracting pixel brightness values in a preset area in the second photometric picture, and calculating an average brightness value; calculating the sensitivities of the photosensitive chip under different wavelengths according to the average brightness value and the initial brightness value, and storing the wavelength value and the sensitivity value as a second table correspondingly; acquiring the wavelength measurement value, inquiring the light transmittance and the sensitivity corresponding to the wavelength measurement value in the first table and the second table, and inquiring the target light transmittance corresponding to the wavelength measurement value in a preset standard colorimetric system; calculating a compensation coefficient corresponding to the wavelength measurement value according to the wavelength measurement value, the corresponding light transmittance, the sensitivity and the target light transmittance; acquiring a first photometric picture, and acquiring the actual brightness value of each lamp point from the first photometric picture; calculating a brightness compensation value of the corresponding lamp point according to the compensation coefficient and the actual brightness value of the lamp point;
the LED display screen is connected with the brightness compensation device and used for displaying when the brightness colorimeter measures and the first camera shoots and obtaining and displaying the brightness compensation value.
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