Camera photo-based method for point-by-point inhomogeneous analysis and correction of LED (Light Emitting Diode)
An analysis method and non-uniform technology, applied in the field of point-by-point non-uniform analysis and correction of LEDs based on camera photos, can solve problems such as uneven brightness and chromaticity, and achieve the solution of uneven brightness and chromaticity, easy analysis and correction, and analysis and correction. Correcting the effect of low cost
Inactive Publication Date: 2011-11-02
SOUTH CHINA UNIV OF TECH
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In this way, not only can multiple points be measured at one time, but also pixel-level analysis and correction can be carried out on site, so as to solve the problem of uneven brightness and chromaticity caused by long-term use of LEDs, and prolong the service life of LED displays
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[0027]The technical solutions in the method embodiments are clearly and completely described below by combining the results with the accompanying drawings in the method embodiments. Obviously, the described embodiments are only some implementation examples of the method, not all implementation examples. Based on the implementation examples in this method, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this method.
[0028] Such as figure 1 and 2 As shown, the overall structure of this method is as follows: firstly take a picture through Canon450D, and then extract the RGB value of each pixel from the original RAW format photo through the EDSDK program and save it as a BMP format picture. Set a threshold again. If the number of pixels with the pixel value (RGB) equal to 255 in the entire picture exceeds the threshold, it is determined that the picture is overexposed and needs to be readjusted ...
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The invention discloses a camera photo-based method for point-by-point inhomogeneous analysis and correction of an LED (Light Emitting Diode), comprising five steps of: extracting picture pixel information; extracting the contour of an LED bulb array; rearranging the LED bulb array; calculating the brightness, the chrominance and the saturation of each bulb so as to obtain a correction coefficient matrix; and carrying out pulse width modulation according to the correction coefficient matrix. According to the method provided by the invention, multiple points can be measured at a time, the analysis and the correction at pixel level can be carried out on the spot and an analysis correction device can be conveniently carried to ensure that the analysis and the correction become very convenient and low-cost, therefore, the problem of non-uniform brightness and chrominance because of long service time of the LED is solved and the service life of an LED display screen is prolonged.
Description
technical field [0001] The invention relates to LED display screen correction technology, in particular to a point-by-point non-uniform analysis and correction method for LEDs based on camera photos. Background technique [0002] Due to the difference in brightness of LED light-emitting diodes during production and different degrees of brightness attenuation during use, due to the inconsistency of their brightness attenuation, after one or two years of use, the brightness consistency of the entire screen will be greatly reduced, seriously affecting The display effect and actual service life of the display screen, at this time, it is necessary to perform secondary calibration on the LED screen. In the process of point-by-point calibration of the LED display, the most important point is the collection of the luminance of each light on the display. Based on accurate brightness data, the brightness of each point of the entire screen can be adjusted to be consistent. [0003] B...
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IPC IPC(8): G09G3/00G09G3/32
Inventor 齐德昱高宇翔黎祖月冯子健李克泉
Owner SOUTH CHINA UNIV OF TECH