A color gamut conversion method and device

Abstract

The invention discloses a gamut conversion method and device. The method comprises the steps that a standard test signal is converted into a display equipment RGB signal according to a space conversion matrix which is calculated according to original coordinates; result coordinates corresponding to the display equipment RGB signal are looked up, and target coordinates, to be displayed on a display screen, of the standard test signal are acquired; whether or not the difference between the result coordinates and the target coordinates is larger than a preset error is judged; and if the difference is larger than the preset error, the original coordinates are adjusted, and the standard test signal is converted into a new display equipment RGB signal according to a space conversion matrix which is calculated according to original coordinates obtained after adjustment until the difference between result coordinates corresponding to the new display equipment RGB signal and the target coordinates is smaller than or equal to the preset error. According to the method, the overrange signal problem is taken into account, system byte digit limitation is avoided, the error between the practical coordinates obtained after gamut conversion and the information source coordinates is small, the precision of the practical coordinates is high, and the color distortion problem can be eradicated.

Description

technical field [0001] The present invention relates to the technical field of color gamut mapping, in particular to a color gamut conversion method and device. Background technique [0002] In recent years, high color gamut TVs have quickly occupied the position of flagship products of major TV brands, whether it is the world-class CES (International Consumer Electronics Show, International Consumer Electronics Show) consumer electronics exhibition, or the largest domestic At the AWE (Appliance&electronics World Expo, China Home Appliances and Consumer Electronics Expo) home appliance exhibition, high color gamut is a highlight of the TV display. At present, the color gamut of display devices such as high color gamut televisions can reach or even exceed 100% NTSC (National Television Standards Committee, American national television standard). However, since most information sources are still produced according to the BT.709 standard or BT.2020 standard, for example, the c...

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Problems solved by technology

[0004] However, in the above-mentioned color gamut conversion process, the process of converting the standard space signal into the RGB signal of the display device is usually calculated based on the matrix. Since the problem of out-of-range signals cannot be considered in the matrix calculation process, and the number of bytes in the system is limited, the matrix The calculation result has a limited number of decimal places, resulting in large errors and insufficient precision, which cannot eradicate the problem of color distortion

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