Stitching bright and dark line compensation method

Abstract

The invention puts forward a splicing bright / dark line compensation method comprising the following steps: (i) shooting an image displayed by an LED display screen through an image acquisition device under control to get a correction image; (ii) processing the correction image to get the brightness compensation values of multiple LED lamp points needing correction at a splicing gap in the LED display screen; and (iii) sending the brightness compensation values of the multiple LED lamp points needing correction at the splicing gap to the LED display control system hardware of the LED display screen all at once so as to update the brightness and chrominance calibration coefficients corresponding to the multiple LED lamp points in the original brightness and chrominance calibration coefficients in the LED display control system hardware. Therefore, secondary correction of the bright / dark lines of an LED display screen can be realized without an original database file, the brightness compensation values can be sent all at once to the LED display control system hardware by generating a two-dimensional image, and the method is quick and efficient.

Description

technical field [0001] The invention relates to the technical field of LED display correction, in particular to a splicing bright and dark line compensation method. Background technique [0002] The LED display screen is spliced ​​by several LED cabinets or LED display modules (here collectively referred to as splicing units). Each splicing unit can be calibrated in the factory to ensure the brightness and chromaticity uniformity of the LED display screen when it leaves the factory. Good, but in the process of splicing, due to the limitation of machining accuracy, assembly accuracy and other technological reasons, the distance between the LED light points on the edge of the adjacent splicing unit at the splicing unit may be larger or smaller than other LED lights The pixel center distance is called the splicing gap; at this time, the luminous density of the LED light point at this place will change, and the impact on the display quality is mainly manifested as a bright or da...

AI Technical Summary

Problems solved by technology

[0005] Although the existing technology has solved the problem of complex operation and low efficiency of manual adjustment of bright and dark lines, it still has some disadvantages, for example: 1) when correcting bright and dark lines, it is necessary to know the previous correction situation of the LED display; 2) if the LED display is originally After full-screen calibration, and the bright and dark line correction has been carried out during the full-screen calibration at that time, the original brightness and chromaticity correction coefficients that do not include bright and dark line correction must be restored based on the gap information recorded at that time, and then re-uploaded to the LED display. The hardware of the LED display control system starts to take pictures with the camera to eliminate the bright and dark lines; and 3) If the LED display is originally calibrated by the cabinet, it is necessary to know the real arrangement position of the cabinet in the actual environment before the bright and dark lines can be adjusted. The correction coefficient is applied to the corresponding position, or the box data is converted into a full-screen database according to the arrangement position of the box

The above three shortcomings lead to the following limitations in the existing technology: the second bright and dark line correction must have the original database; and in case of data loss or wrong record of the cabinet position, it will cause the display effect after being uploaded to the LED display control system hardware problem appear