CN114677958A - Correction method, device and system for LED display screen - Google Patents
Correction method, device and system for LED display screen Download PDFInfo
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- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
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Abstract
The invention relates to the technical field of LED display screen correction, and particularly discloses a correction method, a device and a system of an LED display screen, wherein the correction method comprises the steps of acquiring an initial screen display image when the LED display screen is displayed under a preset gray-scale value; generating an initial brightness correction coefficient; acquiring a first correction screen display image displayed after the brightness of the LED display screen is corrected; generating a first brightness correction coefficient; calculating the product of the initial brightness correction coefficient and the first brightness correction coefficient as a second brightness correction coefficient; acquiring a second correction screen display image displayed by the LED display screen after correction; generating a chrominance correction coefficient according to the second correction screen display image and a preset chrominance correction coefficient calculation strategy; and calculating the product of the second brightness correction coefficient and the chrominance correction coefficient as a final screen correction coefficient. The invention overcomes the defect of poor display effect of the whole screen caused by over-bright or over-dark display of partial modules and ensures the display effect of the LED display screen.
Description
Technical Field
The invention relates to the technical field of LED display screen correction, in particular to a method, a device and a system for correcting an LED display screen.
Background
In recent years, the LED display screen industry is rapidly developed, and the application industry is diversified. For example, as a new media promotion technique, an LED advertisement screen has become a new strength of the advertisement media industry instead of a banner, and has the characteristics of high definition, high brightness, bright color, bright body, novel design, synchronous image broadcasting and the like of a display screen, and the LED advertisement screen can stand out from massive advertisement information and give visual stimulation to audiences unconsciously to catch the attention of the audiences, thereby completing the cross-media and multi-format transmission of news information products and giving more diversified information experience to readers in digital ages, and application places generally include shopping malls, building outer walls, show windows, walking streets, office buildings, real estate companies, hotels and the like.
In view of the demand for large-scale picture display, people adopt a plurality of LED modules to splice to obtain a spliced LED display large screen. Because the LED modules can come from different manufacturers, or are produced in different batches, or because of factors such as unstable production conditions, the display difference of brightness and chromaticity exists in each module in the spliced LED display screen, and human eyes are very sensitive to the difference of brightness and color, so that the watching experience of people is greatly influenced. In the prior art, a correction method for an LED display screen exists, a group of correction coefficients is generated by collecting screen data of a certain order, and then the LED display screen is corrected, so that the display effect area of the LED display screen is homogenized. However, for a display module with a large brightness difference, such as a partial COB module, or a module with a partial brightness difference of more than 50%, the camera cannot be adjusted to appropriate shooting parameters in the correction process, because when the camera shoots the LED display screen, the exposure time needs to be adjusted according to the brightness of the screen to achieve the optimal exposure state, if the camera is too bright or too dark, the acquisition information is inaccurate, when the original brightness difference of the screen is too large, the over-bright area is already over-exposed, and the over-dark area is still in the under-exposed area, which brings great difficulty to the camera acquisition, not only is the acquisition process time-consuming, but also the performance requirement of the camera is high; in addition, the LED screen has linearity problem, and because the brightness difference between the bright area and the dark area of the screen is too large due to the fact that the light emitting tube cores of the driving chip and the lamp are determined by the production industry, the brightness of the bright area and the brightness of the dark area of the screen must be reduced, and the more the brightness is reduced, the more the linearity difference is obvious, so that more problems are brought to the display effect of the display screen after correction.
Therefore, a method for solving the above problems needs to be found.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a method, a device and a system for correcting an LED display screen.
The invention discloses a method for correcting an LED display screen, which comprises the following steps:
acquiring an initial screen display image when the LED display screen displays under a preset gray scale value;
generating an initial brightness correction coefficient according to an initial screen display image and a preset first correction coefficient calculation strategy;
sending the initial brightness correction coefficient to an LED display screen, and acquiring a first correction screen display image displayed after the LED display screen is corrected;
generating a first brightness correction coefficient according to the first correction screen display image and a first correction coefficient calculation strategy;
calculating the product of the initial brightness correction coefficient and the first brightness correction coefficient as a second brightness correction coefficient;
sending the second brightness correction coefficient to the LED display screen, and acquiring a second correction screen display image when the LED display screen is corrected and displayed;
generating a chromaticity correction coefficient according to a second correction screen display image and a preset chromaticity correction coefficient calculation strategy;
calculating the product of the second brightness correction coefficient and the chrominance correction coefficient as a final screen correction coefficient;
and sending the screen final correction coefficient to the LED display screen.
Further, the method also comprises the following steps:
calculating a gray scale difference value of a second correction screen display image according to a preset gray scale difference calculation strategy, and judging whether the gray scale difference value is greater than a preset gray scale difference threshold value; if so, then
Generating a new first brightness correction coefficient according to the second correction screen display image and the first correction coefficient calculation strategy;
calculating the product of the second brightness correction coefficient and the new first brightness correction coefficient as a third brightness correction coefficient;
correcting the LED display screen according to the third brightness correction coefficient, and acquiring a third correction screen display image displayed by the LED display screen after correction;
generating a chromaticity correction coefficient according to a third correction screen display image and a preset chromaticity correction coefficient calculation strategy;
calculating the product of the third brightness correction coefficient and the chrominance correction coefficient as a final screen correction coefficient;
and sending the screen final correction coefficient to the LED display screen.
Further, generating an initial brightness correction coefficient according to the initial screen display image and a preset first correction coefficient calculation strategy, includes:
extracting an initial brightness value of the LED display screen from the initial screen display image;
acquiring a target brightness value of an LED display screen when the LED display screen displays under a preset gray scale value;
and generating an initial brightness correction coefficient according to the initial brightness value, the target brightness value and the first correction coefficient calculation strategy.
Further, calculating a gray scale difference value of the second correction screen display image according to a preset gray scale difference calculation strategy, including:
extracting the correction brightness value of the LED display screen from the second correction screen display image, and calculating the mean value of the correction brightness;
finding out the highest gray level value and the lowest gray level value in the corrected brightness value;
and calculating gray scale difference values according to the gray scale difference calculation strategy, the highest gray scale value, the lowest gray scale value and the corrected brightness mean value.
Further, the gray scale difference calculation strategy comprises:
the gray scale difference value (highest gray scale value-lowest gray scale value)/the average corrected luminance value is 100%.
Further, the initial brightness value and the corrected brightness value are both spectral tristimulus value matrices.
Further, generating a chrominance correction coefficient according to the second correction screen display image and a preset chrominance correction coefficient calculation strategy comprises:
extracting a tristimulus value matrix of an original color gamut space of the LED display screen from the second correction screen display image;
acquiring a tristimulus value matrix of a target color gamut space;
and generating a chromaticity correction coefficient according to the tristimulus value matrix of the original color gamut space, the tristimulus value matrix of the target color gamut space and a chromaticity correction coefficient calculation strategy.
Further, when an initial screen display image displayed by the LED display screen under the preset gray scale value is obtained, the preset gray scale value is the highest gray scale value.
The invention also comprises a correction device of the LED display screen, the correction device comprises an image acquisition module, a first correction coefficient calculation module, a correction coefficient sending module, a second correction coefficient calculation module and a final correction coefficient calculation module, wherein:
the image acquisition module is connected with the first correction coefficient calculation module and the final correction coefficient calculation module; the image acquisition module is used for acquiring an initial screen display image when the LED display screen displays under a preset gray scale value, acquiring a first correction screen display image when the LED display screen displays after correction, and acquiring a second correction screen display image when the LED display screen displays after correction;
the first correction coefficient calculation module is connected with the image acquisition module, the correction coefficient sending module and the second correction coefficient calculation module; the first correction coefficient calculation module is used for generating an initial brightness correction coefficient according to the initial screen display image and a preset first correction coefficient calculation strategy and generating a first brightness correction coefficient according to the first correction screen display image and the first correction coefficient calculation strategy;
the correction coefficient sending module is connected with the first correction coefficient calculating module, the second correction coefficient calculating module and the final correction coefficient calculating module; the correction coefficient sending module is used for sending the initial brightness correction coefficient to the LED display screen, sending the second brightness correction coefficient to the LED display screen and sending the final screen correction coefficient to the LED display screen;
the second correction coefficient calculation module is connected with the first correction coefficient calculation module, the correction coefficient sending module and the final correction coefficient calculation module; the second correction coefficient calculation module is used for calculating the product of the initial brightness correction coefficient and the first brightness correction coefficient as a second brightness correction coefficient;
the final correction coefficient calculation module is connected with the image acquisition module, the correction coefficient sending module and the second correction coefficient calculation module; and the final correction coefficient calculation module is used for generating a chrominance correction coefficient according to the second correction screen display image and a preset chrominance correction coefficient calculation strategy and calculating the product of the second luminance correction coefficient and the chrominance correction coefficient to be used as a screen final correction coefficient.
The invention also comprises a correction system of the LED display screen, wherein the correction system comprises the correction device, a camera, a sending device, a receiving device and the LED display screen, and the correction system further comprises the camera, the sending device, the receiving device and the LED display screen, wherein:
the camera is connected with the correcting device; the camera is positioned in front of the LED display screen and used for collecting an initial screen display image when the LED display screen displays under a preset gray scale value, collecting a first correction screen display image when the LED display screen displays after correction, and collecting a second correction screen display image when the LED display screen displays after correction;
the correcting device is connected with the camera and the sending equipment, is connected with the LED display screen through the connection of the sending equipment and the receiving equipment, and is used for acquiring an initial screen display image when the LED display screen displays under a preset gray scale value; generating an initial brightness correction coefficient according to the initial screen display image and a preset first correction coefficient calculation strategy; sending the initial brightness correction coefficient to the LED display screen, and acquiring a first correction screen display image displayed by the LED display screen after correction; generating a first brightness correction coefficient according to the first correction screen display image and a first correction coefficient calculation strategy, calculating the product of the initial brightness correction coefficient and the first brightness correction coefficient to serve as a second brightness correction coefficient, sending the second brightness correction coefficient to the LED display screen, and acquiring a second correction screen display image displayed after the brightness of the LED display screen is corrected; generating a chrominance correction coefficient according to a second correction screen display image and a preset chrominance correction coefficient calculation strategy, and calculating the product of the second luminance correction coefficient and the chrominance correction coefficient to be used as a final screen correction coefficient; sending the final screen correction coefficient to the LED display screen;
the LED display screen is connected with the receiving equipment and is connected with the correcting device through the connection of the receiving equipment and the sending equipment; the LED display screen is used for displaying under a preset gray-scale value, performing screen correction and displaying according to the initial brightness correction coefficient, performing screen correction and displaying according to the second brightness correction coefficient, and performing screen correction and displaying according to the final screen correction coefficient.
The correction method, the device and the system of the LED display screen not only generate the initial brightness correction coefficient to carry out primary brightness correction on the LED display screen, but also carry out secondary brightness correction on the LED display screen according to the product of the first brightness correction coefficient and the initial brightness correction coefficient calculated by the display image of the first correction screen acquired when the LED display screen is corrected and displayed, then generate the chromaticity correction coefficient according to the display image of the second correction screen and the preset chromaticity correction coefficient calculation strategy, calculate the product of the second brightness correction coefficient and the chromaticity correction coefficient as the final screen correction coefficient, carry out chromaticity correction on the LED display screen through the final screen correction coefficient, enable the LED display screen with larger original brightness difference to achieve better brightness and chromaticity correction effect through the scheme, thereby overcoming the defect that the whole screen display effect is poor due to over-brightness or over-darkness display of partial modules, the display effect of the LED display screen is guaranteed, and the watching experience of people is improved.
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 an LED display panel according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a second step of a method for calibrating an LED display panel according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating a third step of a calibration method for an LED display screen according to an embodiment of the present invention;
FIG. 4 is a flowchart illustrating steps of a method for calibrating an LED display panel according to an embodiment of the present invention;
FIG. 5 is a flowchart illustrating steps of a method for calibrating an LED display panel according to an embodiment of the present invention;
FIG. 6 is a flowchart illustrating a sixth step of a method for calibrating an LED display screen according to an embodiment of the present invention;
FIG. 7 is a structural diagram of a calibration device of an LED display screen according to an embodiment of the present invention;
fig. 8 is a structural composition diagram of a correction system of an LED display screen 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 correction method of the LED display screen of the embodiment of the invention, as shown in figure 1, comprises the following steps:
step S1: and acquiring an initial screen display image when the LED display screen displays under a preset gray scale value.
In the step, the initial screen display image can be obtained by shooting the LED display screen displaying the preset gray scale value through the camera, and in view of the phenomena that the screen original brightness difference is overlarge, an overlarge area is already exposed, an overlarge area is still in an underexposed area, and great difficulty is brought to camera acquisition due to the fact that the phenomena are mentioned in the background technology of the invention, the embodiment of the invention realizes shooting through a CCM series camera, the CCM series camera has high precision, the shooting process is quick and accurate, the requirement of multiple times of shooting can be met, and the due image quality can also be achieved.
In this embodiment, the initial screen display image is an image displayed by the LED display screen according to a preset gray scale value, and the value range of the preset gray scale value is not limited in this embodiment, and any gray scale value of 0 to 255 gray scales of the LED display screen may be selected. Preferably, in this embodiment, the preset gray scale value is the highest gray scale value, that is, the gray scale value is 255. The highest gray scale value is selected for the embodiment, so that the LED display screen is in the brightest display effect, the exposure time is fastest when the camera collects the initial screen display image, and the initial screen display image can be shot fastest.
Step S2: and generating an initial brightness correction coefficient according to the initial screen display image and a preset first correction coefficient calculation strategy.
After obtaining the initial screen display image, performing a first correction on the LED display screen, specifically, as shown in fig. 2, step S2 of this embodiment includes:
step S201: and extracting the initial brightness value of the LED display screen from the initial screen display image.
The method for extracting the brightness value of the light point from the image can be implemented by the prior art, and the embodiment is not limited, and the initial brightness value Y1 is obtained after the step S201 is executed.
Step S202: and acquiring a target brightness value of the LED display screen when the LED display screen displays under a preset gray scale value.
The target brightness value in this step may be set by an operator before or during the correction of the LED display screen or recommended by the upper computer software, or a set of target brightness values may be recommended by using the existing correction software according to the initial brightness value Y1.
Step S203: and generating an initial brightness correction coefficient according to the initial brightness value, the target brightness value and the first correction coefficient calculation strategy.
The first correction coefficient calculation strategy of this embodiment adopts the existing correction coefficient calculation method, that is: since the image luminance value is the initial luminance value Y1 obtained in step S201 and the target luminance value is the target luminance value obtained in step S202 in this step, the initial luminance correction coefficient in step S203 can be obtained by directly calculating the ratio of the target luminance value to the initial luminance value Y1, and the correction coefficient is represented by LumiCeof 1.
After the initial luminance correction coefficient is calculated, step S3 is performed.
Step S3: and sending the initial brightness correction coefficient to the LED display screen, and acquiring a first correction screen display image displayed by the LED display screen after correction.
And after receiving the initial brightness correction coefficient, the LED display screen performs first brightness correction and correspondingly displays the brightness correction. In general, for an LED display screen composed of modules with obvious brightness difference, an ideal correction effect cannot be achieved only by one brightness correction, and therefore, after an initial brightness correction coefficient is calculated, the LED display screen needs to be corrected again, so that a first correction screen display image displayed after the first brightness correction of the LED display screen is obtained in this step, and similarly, the first correction screen display image obtained in this step can be obtained in the same obtaining manner as in step S1, and details are not repeated here.
Step S4: and generating a first brightness correction coefficient according to the first correction screen display image and the first correction coefficient calculation strategy.
The first correction coefficient calculation strategy in this step is the same as the first correction coefficient calculation strategy in step S2 described above, and is also performed by the conventional method: the first luminance correction coefficient of the first correction screen display image is calculated with the correction coefficient being the target luminance value/image luminance value, and the image luminance value in this step is the correction luminance value Y2 extracted from the first correction screen display image acquired in step S3.
Specifically, as shown in fig. 3, step S4 of the present embodiment includes:
step S401: the corrected brightness value of the LED display screen is extracted from the first corrected screen display image.
By this step, the corrected luminance value Y2 of the first corrected screen display image is obtained.
Step S402: and acquiring a target brightness value of the LED display screen after brightness correction.
The target brightness value in this step is related to the brightness of the LED display screen after the brightness correction, and may be the same group of data as the target brightness value in step S202, or a group of target brightness values may be recommended by the existing correction software according to the correction brightness value Y2, that is, the target brightness value in this step may be the same as or different from the target brightness value in step S202.
Step S403: and generating a first brightness correction coefficient according to the correction brightness value, the target brightness value and the first correction coefficient calculation strategy.
This step is calculated by the first luminance correction coefficient being the target luminance value/correction luminance value Y2. The first luminance correction coefficient is obtained again and then the process proceeds to step S5.
Step S5: and calculating the product of the initial brightness correction coefficient and the first brightness correction coefficient as a second brightness correction coefficient.
In this embodiment, the initial luminance correction coefficient is LumiCeof1, the first luminance correction coefficient calculated in step S4 is referred to as LumiCeof2, and if the second luminance correction coefficient is referred to as LumiCeof2 ', LumiCeof 2' ═ LumiCeof1 LumiCeof2 in this step. After the second luminance correction coefficient LumiCeof 2' is obtained, step S6 will be performed.
Step S6: and sending the second brightness correction coefficient to the LED display screen, and acquiring a second correction screen display image when the LED display screen displays after correction.
With reference to the example of the previous step, in this step, after the LED display screen receives the second luminance correction coefficient LumiCeof2 ', another luminance correction is performed according to the second luminance correction coefficient LumiCeof 2' (this time, the second luminance correction is performed on the LED display screen), and then the image displayed after the LED display screen is corrected, that is, the second correction screen display image, is obtained.
Specifically, the initial luminance value and the corrected luminance value in the embodiment of the present invention are both spectral tristimulus value matrices. For example，
Then
Step S7: and generating a chroma correction coefficient according to the second correction screen display image and a preset chroma correction coefficient calculation strategy.
Specifically, the step S7 is to generate the chrominance correction coefficient according to the second correction screen display image and the preset chrominance correction coefficient calculation strategy, as shown in fig. 4, and includes the following steps:
step S701: a tristimulus value matrix of the original color gamut space of the LED display screen is extracted from the second correction screen display image.
Step S702: and acquiring a tristimulus value matrix of the target color gamut space.
Step S703: and generating a chromaticity correction coefficient according to the tristimulus value matrix of the original color gamut space, the tristimulus value matrix of the target color gamut space and a chromaticity correction coefficient calculation strategy.
Step S7 of this embodiment is to implement the chromaticity correction on the LED display screen, so that the tristimulus value matrix of the original color gamut space in the display image of the second correction screen is obtained, and the tristimulus value matrix of the target color gamut space is obtained, and the target color gamut space may select CIE1931 that is commonly used by the existing LEDs. The chroma correction coefficient calculation strategy of the present embodiment is: the chroma correction coefficient is calculated by the tristimulus matrix, so that the chroma correction coefficient can be expressed as the chroma correction coefficient
Step S8: and calculating the product of the second brightness correction coefficient and the chrominance correction coefficient as a final screen correction coefficient.
After the chromaticity correction coefficient is calculated through the above steps, the product of the second luminance correction coefficient and the chromaticity correction coefficient is calculated as a screen final correction coefficient, which is denoted by Ceof. In the present embodiment, the luminance correction is performed twice through the preceding steps, and the screen final correction coefficient Ceof LumiCeof 2'. chromomacoef is 2. LumiCeof 1. chromomacoef in this step.
Step S9: and sending the screen final correction coefficient to the LED display screen.
And taking the final screen correction coefficient as a correction coefficient for the gray scale of the LED display screen, and realizing the correction of the gray scale by the LED display screen through the final screen correction coefficient.
Specifically, as shown in fig. 5, after step S6 is executed, the embodiment of the present invention further includes:
step S10: calculating a gray scale difference value of a second correction screen display image according to a preset gray scale difference calculation strategy, and judging whether the gray scale difference value is larger than a preset gray scale difference threshold value or not; if so, go to step S11, otherwise, go to step S7.
As shown in fig. 6, the step S10 of calculating the gray-scale difference value of the second correction screen display image according to the preset gray-scale difference calculation strategy may include:
step S1001: and extracting the corrected brightness value of the LED display screen from the second corrected screen display image, and calculating the corrected brightness mean value.
The process of this step of extracting the corrected luminance value of the LED display screen from the second corrected screen display image is similar to the process of step S201 of extracting the initial luminance value of the LED display screen from the initial screen display image. The second correction screen display image in the present embodiment is obtained by capturing the display after the LED display screen has undergone luminance correction twice, and the present embodiment here represents the extracted correction luminance value as Y3 and the calculated correction luminance average value as AVG.
Step S1002: and finding out the highest gray level value and the lowest gray level value in the corrected brightness value.
The highest and lowest gray scale values from the corrected luminance value Y3 are denoted by MAX and MIN, respectively.
Step S1003: and calculating gray scale difference values according to the gray scale difference calculation strategy, the highest gray scale value, the lowest gray scale value and the corrected brightness mean value.
The gray scale difference calculation strategy of the present embodiment may include:
the gray level difference value (highest gray level value-lowest gray level value)/corrected luminance average value is 100%.
Therefore, the gray scale difference value of this step is calculated by (MAX-MIN)/AVG 100%.
Comparing the gray level difference value with a preset gray level difference threshold, if the gray level difference value is greater than the preset gray level difference threshold, executing step S11. If the gray level difference is less than or equal to the predetermined gray level difference threshold, step S7 is executed.
The gray level difference threshold is used to measure whether the luminance correction effect of the LED display screen has achieved the desired effect, and the gray level difference threshold can be set by a person skilled in the art according to the requirement for the correction effect, for example, the gray level difference threshold is set to 30%, if the gray level difference value is greater than 30%, the step S11 is executed, and if the gray level difference value is less than or equal to 30%, the step S7 is executed.
Step S11: a new first luminance correction coefficient is generated based on the second correction screen display image and the first correction coefficient calculation strategy.
The calculation in this step is performed by the same method as that in step S4, and the same first correction coefficient calculation strategy is used to calculate a new first luminance correction coefficient, denoted as LumiCeof3, from the corrected luminance value Y3.
Step S12: and calculating the product of the second brightness correction coefficient and the new first brightness correction coefficient as a third brightness correction coefficient.
If the third luminance correction coefficient is denoted as LumiCeof3 ', LumiCeof3 ' ═ LumiCeof3 × LumiCeof2 ' ═ LumiCeof3 × LumiCeof2 × LumiCeof1 is given.
Step S13: and correcting the LED display screen according to the third brightness correction coefficient, and acquiring a third correction screen display image when the LED display screen is corrected and displayed.
This step is similar to step S6 of the present embodiment and will not be described herein.
Step S14: and generating a chromaticity correction coefficient according to the third correction screen display image and a preset chromaticity correction coefficient calculation strategy.
For the generation of the chromaticity correction coefficient in this step, reference may be made to step S7 in the foregoing embodiment, but the second correction screen display image in step S7 is replaced with the third correction screen display image, which will not be described herein in detail.
Step S15: and calculating the product of the third brightness correction coefficient and the chrominance correction coefficient as a final screen correction coefficient.
Also, this step is implemented similarly to step S8 of the foregoing embodiment, and the screen final correction coefficient is denoted by Ceof. The present embodiment realizes three brightness corrections through the preceding steps, and the screen final correction coefficient Ceof LumiCeof 3'. chromomacoef is LumiCeof 3. LumiCeof 2. LumiCeof 1. chromomacoef in this step.
Step S9: and sending the screen final correction coefficient to the LED display screen.
And taking the final screen correction coefficient as a correction coefficient for the gray scale of the LED display screen, and realizing the correction of the gray scale by the LED display screen through the final screen correction coefficient.
According to the embodiment of the invention, the LED display screen is subjected to the chroma correction after the brightness correction for three times, and the effect after the brightness correction for the second time is evaluated, so that the brightness is corrected again under the condition of not meeting the threshold requirement, and the brightness correction effect of the LED display screen is ensured.
On the basis of the above embodiments, the present invention may perform brightness correction for multiple iterations, for example, after performing brightness correction for the third time on the LED display screen, obtain a corresponding fourth corrected screen display image, calculate a corresponding gray scale difference value, and simultaneously determine a magnitude relationship between the gray scale difference value and a preset gray scale difference threshold value, if the gray scale difference value is less than or equal to the preset gray scale difference threshold value, it is determined that a brightness correction requirement has been reached, perform a relevant step of gray scale correction, and if the gray scale difference value is greater than the preset gray scale difference threshold value, perform brightness correction for the LED display screen more times in a manner similar to that in steps S10 to S13.
After the third brightness correction is performed on the LED display screen according to LumiCeof3 ', if the gray scale difference value of the image displayed on the fourth correction screen is still greater than the gray scale difference threshold, the new first brightness correction coefficient corresponding to the fourth correction is calculated again as LumiCeof4, and the fourth brightness correction coefficient is recorded as LumiCeof 4', then LumiCeof4 '═ LumiCeof4 LumiCeof 3' ═ LumiCeof4 ═ LumiCeof3 LumiCeof2 × LumiCeof 1.
By the method for correcting the LED display screen, the due display effect can be achieved by correcting the brightness of a common LED display screen for 2-3 times, and the due display effect can be achieved by correcting the LED display screen with a large brightness difference of a part of modules for multiple times. And after the brightness correction, gray scale correction is carried out, so that the LED display screen achieves a better display effect.
The embodiment of the present invention further includes a correction device for an LED display screen, as shown in fig. 7, the correction device 10 includes an image acquisition module 101, a first correction coefficient calculation module 102, a correction coefficient transmission module 103, a second correction coefficient calculation module 104, and a final correction coefficient calculation module 105, where:
the image acquisition module 101 is connected with the first correction coefficient calculation module 102 and the final correction coefficient calculation module 105; the image acquisition module 101 is configured to acquire an initial screen display image when the LED display screen displays at a preset gray scale value, acquire a first corrected screen display image when the LED display screen displays after correction, and acquire a second corrected screen display image when the LED display screen displays after correction;
the first correction coefficient calculation module 102 is connected with the image acquisition module 101, the correction coefficient sending module 103 and the second correction coefficient calculation module 104; the first correction coefficient calculation module 102 is configured to generate an initial luminance correction coefficient according to the initial screen display image and a preset first correction coefficient calculation strategy, and generate a first luminance correction coefficient according to the first correction screen display image and the first correction coefficient calculation strategy;
a correction coefficient sending module 103 connected to the first correction coefficient calculating module 102, the second correction coefficient calculating module 104, and the final correction coefficient calculating module 105; the correction coefficient sending module 103 is configured to send the initial brightness correction coefficient to the LED display screen, send the second brightness correction coefficient to the LED display screen, and send the final screen correction coefficient to the LED display screen;
a second correction coefficient calculation module 104, connected to the first correction coefficient calculation module 102, the correction coefficient transmission module 103, and the final correction coefficient calculation module 105; the second correction coefficient calculation module 104 is configured to calculate a product of the initial luminance correction coefficient and the first luminance correction coefficient as a second luminance correction coefficient;
a final correction coefficient calculation module 105 connected to the image acquisition module 101, the correction coefficient transmission module 103, and the second correction coefficient calculation module 104; the final correction coefficient calculation module 105 is configured to generate a chrominance correction coefficient according to the second correction screen display image and a preset chrominance correction coefficient calculation policy, and calculate a product of the second luminance correction coefficient and the chrominance correction coefficient as a screen final correction coefficient.
For the implementation of the functions of the correction device according to the embodiment of the present invention, reference may be made to the description of the steps of the correction method for the LED display screen according to the foregoing embodiment, which will not be described herein again.
The embodiment of the present invention further includes a correction system of an LED display screen, as shown in fig. 8, the correction system includes the correction apparatus 10 of the above embodiment, and further includes a camera 20, a sending device 30, a receiving device 40, and an LED display screen 50, where:
a camera 20 connected with the calibration device 10; the camera 20 is located in front of the LED display screen 50, and the camera 20 is configured to acquire an initial screen display image when the LED display screen 50 displays at a preset gray scale value, acquire a first corrected screen display image when the LED display screen 50 displays after correction, and acquire a second corrected screen display image when the LED display screen 50 displays after correction;
the correcting device 10 is connected with the camera 20 and the sending equipment 30, and is connected with the LED display screen 50 through the connection between the sending equipment 30 and the receiving equipment 40, and the correcting device 10 is used for acquiring an initial screen display image when the LED display screen 50 displays at a preset gray scale value; generating an initial brightness correction coefficient according to the initial screen display image and a preset first correction coefficient calculation strategy; sending the initial brightness correction coefficient to the LED display screen 50, and acquiring a first correction screen display image displayed after the LED display screen 50 is corrected; generating a first brightness correction coefficient according to the first correction screen display image and a first correction coefficient calculation strategy, calculating a product of the initial brightness correction coefficient and the first brightness correction coefficient to serve as a second brightness correction coefficient, sending the second brightness correction coefficient to the LED display screen 50, and acquiring a second correction screen display image displayed after the brightness of the LED display screen 50 is corrected; generating a chrominance correction coefficient according to a second correction screen display image and a preset chrominance correction coefficient calculation strategy, and calculating the product of the second luminance correction coefficient and the chrominance correction coefficient to be used as a final screen correction coefficient; and sending the screen final correction factor to the LED display screen 50;
the LED display screen 50 is connected with the receiving equipment 40 and is connected with the correcting device 10 through the connection of the receiving equipment 40 and the sending equipment 30; the LED display screen 50 is used for displaying at a preset gray scale value, performing screen correction and displaying according to the initial brightness correction coefficient, performing screen correction and displaying according to the second brightness correction coefficient, and performing screen correction and displaying according to the final screen correction coefficient.
The calibration system of the embodiment of the invention can be realized by the calibration method and the calibration device of the LED display screen according to the foregoing embodiments, and will not be described herein again.
The correction method, the device and the system of the LED display screen of the embodiment of the invention not only generate the initial brightness correction coefficient to carry out primary brightness correction on the LED display screen, but also carry out secondary brightness correction on the LED display screen according to the product of the first brightness correction coefficient and the initial brightness correction coefficient calculated by the first correction screen display image acquired when the LED display screen is corrected and displayed, then generate the chromaticity correction coefficient according to the second correction screen display image and the preset chromaticity correction coefficient calculation strategy, calculate the product of the second brightness correction coefficient and the chromaticity correction coefficient as the final screen correction coefficient, carry out chromaticity correction on the LED display screen through the final screen correction coefficient, enable the LED display screen with larger original brightness difference to achieve better brightness and chromaticity correction effect through the scheme, thereby overcoming the defect of poor whole screen display effect caused by over-bright or over-dark display of partial modules, the display effect of the LED display screen is guaranteed, and the watching experience of people is improved.
The present invention has been further described with reference to specific embodiments, but it should be understood that the specific description herein should not be construed as limiting the spirit and scope of the invention, and that various modifications to the above-described embodiments, which would occur to persons skilled in the art upon reading this description, are within the scope of the invention.
Claims (10)
1. A correction method of an LED display screen is characterized by comprising the following steps:
acquiring an initial screen display image when the LED display screen displays under a preset gray scale value;
calculating a strategy according to the initial screen display image and a preset first correction coefficient to generate an initial brightness correction coefficient;
sending the initial brightness correction coefficient to an LED display screen, and acquiring a first correction screen display image displayed by the LED display screen after correction;
generating a first brightness correction coefficient according to the first correction screen display image and the first correction coefficient calculation strategy;
calculating a product of the initial luminance correction coefficient and the first luminance correction coefficient as a second luminance correction coefficient;
sending the second brightness correction coefficient to the LED display screen, and acquiring a second correction screen display image when the LED display screen is corrected and displayed;
generating a chrominance correction coefficient according to the second correction screen display image and a preset chrominance correction coefficient calculation strategy;
calculating the product of the second brightness correction coefficient and the chrominance correction coefficient as a final screen correction coefficient;
and sending the screen final correction coefficient to the LED display screen.
2. The method for correcting an LED display screen according to claim 1, further comprising:
calculating a gray scale difference value of the second correction screen display image according to a preset gray scale difference calculation strategy, and judging whether the gray scale difference value is greater than a preset gray scale difference threshold value; if so, then
Generating a new first luminance correction coefficient from the second correction screen display image and the first correction coefficient calculation strategy;
calculating a product of the second brightness correction coefficient and the new first brightness correction coefficient as a third brightness correction coefficient;
correcting the LED display screen according to the third brightness correction coefficient, and acquiring a third correction screen display image displayed by the LED display screen after correction;
generating a chromaticity correction coefficient according to the third correction screen display image and a preset chromaticity correction coefficient calculation strategy;
calculating the product of the third brightness correction coefficient and the chrominance correction coefficient as a final screen correction coefficient;
and sending the screen final correction coefficient to the LED display screen.
3. The method for correcting an LED display screen according to claim 1, wherein the generating an initial brightness correction factor according to the initial screen display image and a preset first correction factor calculation strategy comprises:
extracting an initial brightness value of the LED display screen from the initial screen display image;
acquiring a target brightness value of an LED display screen when the LED display screen displays under a preset gray scale value;
and generating an initial brightness correction coefficient according to the initial brightness value, the target brightness value and the first correction coefficient calculation strategy.
4. The method for correcting an LED display screen of claim 2, wherein calculating gray scale difference values of the second correction screen display image according to a preset gray scale difference calculation strategy comprises:
extracting the correction brightness value of the LED display screen from the second correction screen display image, and calculating a correction brightness mean value;
finding out the highest gray level value and the lowest gray level value in the corrected brightness values;
and calculating gray scale difference values according to the gray scale difference calculation strategy, the highest gray scale value, the lowest gray scale value and the corrected brightness mean value.
5. The method of calibrating an LED display screen of claim 4, wherein the gray scale difference calculation strategy comprises:
the gray level difference value (highest gray level value-lowest gray level value)/corrected luminance average value is 100%.
6. The method of calibrating an LED display screen of claim 3, wherein said initial brightness value and said calibration brightness value are each a spectral tristimulus value matrix.
7. The method of correcting an LED display screen of claim 1, wherein generating chrominance correction coefficients from the second correction screen display image and a preset chrominance correction coefficient calculation strategy comprises:
extracting a tristimulus value matrix of an original color gamut space of the LED display screen from the second correction screen display image;
acquiring a tristimulus value matrix of a target color gamut space;
and generating a chromaticity correction coefficient according to the tristimulus value matrix of the original color gamut space, the tristimulus value matrix of the target color gamut space and the chromaticity correction coefficient calculation strategy.
8. The method for correcting an LED display screen according to claim 1, wherein the preset gray scale value is the highest gray scale value when an initial screen display image is obtained when the LED display screen is displayed at the preset gray scale value.
9. The correction device of the LED display screen is characterized by comprising an image acquisition module, a first correction coefficient calculation module, a correction coefficient sending module, a second correction coefficient calculation module and a final correction coefficient calculation module, wherein:
the image acquisition module is connected with the first correction coefficient calculation module and the final correction coefficient calculation module; the image acquisition module is used for acquiring an initial screen display image when the LED display screen displays under a preset gray scale value, acquiring a first correction screen display image when the LED display screen displays after correction, and acquiring a second correction screen display image when the LED display screen displays after correction;
the first correction coefficient calculation module is connected with the image acquisition module, the correction coefficient sending module and the second correction coefficient calculation module; the first correction coefficient calculation module is used for generating an initial brightness correction coefficient according to the initial screen display image and a preset first correction coefficient calculation strategy, and generating a first brightness correction coefficient according to the first correction screen display image and the first correction coefficient calculation strategy;
the correction coefficient sending module is connected with the first correction coefficient calculating module, the second correction coefficient calculating module and the final correction coefficient calculating module; the correction coefficient sending module is used for sending the initial brightness correction coefficient to the LED display screen, sending the second brightness correction coefficient to the LED display screen and sending the final screen correction coefficient to the LED display screen;
the second correction coefficient calculation module is connected with the first correction coefficient calculation module, the correction coefficient sending module and the final correction coefficient calculation module; the second correction coefficient calculation module is used for calculating the product of the initial brightness correction coefficient and the first brightness correction coefficient as a second brightness correction coefficient;
the final correction coefficient calculation module is connected with the image acquisition module, the correction coefficient sending module and the second correction coefficient calculation module; the final correction coefficient calculation module is configured to generate a chrominance correction coefficient according to the second correction screen display image and a preset chrominance correction coefficient calculation policy, and calculate a product of the second luminance correction coefficient and the chrominance correction coefficient as the screen final correction coefficient.
10. A calibration system for an LED display screen, the calibration system comprising the calibration apparatus of claim 9, further comprising a camera, a transmitting device, a receiving device, and an LED display screen, wherein:
the camera is connected with the correcting device; the camera is positioned in front of the LED display screen and is used for collecting an initial screen display image when the LED display screen is displayed under a preset gray scale value, collecting a first correction screen display image when the LED display screen is displayed after correction, and collecting a second correction screen display image when the LED display screen is displayed after correction;
the correcting device is connected with the camera and the sending equipment, is connected with the LED display screen through the connection between the sending equipment and the receiving equipment, and is used for acquiring an initial screen display image when the LED display screen is displayed under a preset gray scale value; generating an initial brightness correction coefficient according to the initial screen display image and a preset first correction coefficient calculation strategy; sending the initial brightness correction coefficient to an LED display screen, and acquiring a first correction screen display image displayed by the LED display screen after correction; generating a first brightness correction coefficient according to the first correction screen display image and the first correction coefficient calculation strategy, calculating a product of the initial brightness correction coefficient and the first brightness correction coefficient to serve as a second brightness correction coefficient, sending the second brightness correction coefficient to the LED display screen, and acquiring a second correction screen display image displayed by the LED display screen after correction; generating a chrominance correction coefficient according to the second correction screen display image and a preset chrominance correction coefficient calculation strategy, and calculating the product of the second luminance correction coefficient and the chrominance correction coefficient to be used as a screen final correction coefficient; sending the screen final correction coefficient to an LED display screen;
the LED display screen is connected with the receiving equipment and is connected with the correcting device through the connection of the receiving equipment and the sending equipment; the LED display screen is used for displaying under a preset gray scale value, performing screen correction and displaying according to the initial brightness correction coefficient, performing screen correction and displaying according to the second brightness correction coefficient, and performing screen correction and displaying according to the final screen correction coefficient.
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