Method of Improving Out-of-Gamut Color Overlay Mapping

Abstract

The present invention relates to a method for improving out-of-gamut color overlapping mapping. The method comprises: step 10, converting RGB digital values of a color point P in a source gamut into L*a*b* values of a 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 gamut and a boundary of the source gamut as a color point PC and a color point Ps, and determining a reference color point Pi with reference to the color point Lm and a parameter α; step 40, determining whether the color point P is inside or outside a segment |LmPi|, if the color point P is inside the segment |LmPi|, the color point P being still a color point P after being mapped to the target gamut, and entering step 50, and if the color point P is outside the segment |LmPi|, the color point P being a color point P' after being mapped to the target gamut; and step 50, converting L*a*b* values of the color point P mapped to the target gamut into RGB digital values. The method for improving out-of-gamut color overlapping mapping of the present invention enables various colors 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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