Method of improving out-of-gamut color overlap mapping

Abstract

The invention relates to a method of improving out-of-gamut color overlap mapping. The method includes: step 10, converting RGB number values of a color point P in a source gamut into L*a*b* values ofa Lab color space; step 20, determining a hue plane where the color point P is located, and further determining values of a hue angle H, color saturation C and brightness L; step 30, respectively representing intersection points of a straight line, which is defined by the color point P and a color point Lm on a brightness axis of the hue plane, and a boundary of a target color gamut and a boundary of the source color gamut as a color point PC and a color point Ps, and combining the color point Lm and a parameter alpha to determine a reference color point Pi; step 40, judging whether the colorpoint P is inside or outside a line segment |LmPi|, if the color point P is inside the line segment |LmPi|, mapping the color point P to the target color gamut, then still generating the color pointP, and entering a step 50, and if the color point P is outside the line segment |LmPi|, mapping the color point P to the target color gamut, and then generating a color point P'; and step 50, converting L*a*b* values of the color point P, after being mapped to the target color gamut, into RGB number values. The method of improving out-of-gamut color overlap mapping of the invention enables variouscolors to no longer be mapped to the same color point.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a method for improving out-of-gamut color overlapping mapping. Background technique [0002] Color gamut (gamut) is a method of encoding a color, and also refers to the sum of colors that a technical system can produce. In display technology, since the color ranges (ie, color gamuts) that various color devices can represent are different, in order to realize the reproduction of color images, it is necessary to use Gamut Mapping technology and algorithms. Color gamut mapping generally refers to mapping a source color gamut of an input image signal to a target color gamut suitable for a display device to display the image. [0003] Color space, also known as color model, is used to describe color in a generally acceptable way under certain standards. In order to describe colors more appropriately, the International Commission on Illumination (CIE) has proposed various color spac...

AI Technical Summary

Problems solved by technology

The disadvantages of the existing methods are: in the first method, the colors in the K area will be mapped to the cusp T, and in the second method, the colors on the line segment PP' are all mapped to the P' point, and the image located in this area will lose the level of detail after color mapping , producing blurring and halo noise phenomena

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