Pixel-by-pixel calibration method

A pixel-by-pixel calibration method, comprising steps of:

• (i) obtaining luminance-chrominance values of a small screen with sample cabinets by image acquisition on the small screen, wherein the small screen is formed by splicing at least three LED cabinets which are selected from a plurality of LED cabinets to be calibrated as the sample cabinets;
• (ii) obtaining luminance-chrominance mean deviation ratios among the sample cabinets according to the luminance-chrominance values of the small screen;
• (iii) obtaining original luminance-chrominance values of a large screen to be calibrated by image acquisition on the large screen, wherein the large screen is formed by splicing the sample cabinets and some or all of LED cabinets of the plurality of LED cabinets to be calibrated except the sample cabinets;
• (iv) obtaining adjusted luminance-chrominance values of the large screen by adjusting original luminance-chrominance values of the sample cabinets in the original luminance-chrominance values of the large screen by use of the luminance-chrominance mean deviation ratios among the sample cabinets;
• (v) generating luminance-chrominance distribution fitting surfaces of the large screen according to the adjusted luminance-chrominance values of the large screen, and amending the original luminance-chrominance values of the large screen according to the luminance-chrominance distribution fitting surfaces to thereby obtain fitting surface amended luminance-chrominance values of the large screen;
• and
• (vi) setting luminance-chrominance target values based on means of the original luminance-chrominance values of the sample cabinets in the large screen and setting the fitting surface amended luminance-chrominance values of the large screen as luminance-chrominance initial values, and thereby obtaining full-screen pixel-by-pixel calibration coefficients of the large screen.