Color gamut mapping method and color gamut mapping device thereof

Abstract

The invention provides a color gamut mapping method and a color gamut mapping device thereof. The method comprises the following steps of determining the mapping target color gamut of the original color gamut in the same color gamut space; acquiring the Lab value of the color point in the original color gamut, determining the coordinate position of the color point in the hue plane corresponding tothe original color gamut according to the Lab value, and judging the area where the color point is located; if the color point is located outside the mapping target area, determining the intersectionpoint of the horizontal line where the color point is located and the boundary line of the original color gamut and the intersection point of the horizontal line where the color point is located andthe boundary line of the mapping target color gamut; determining the mapping point of the color point on the boundary line of the mapping target color gamut through the area of the graph defined by the intersection point and the intersection point of the original color gamut and the coordinate axis and the ratio of the area difference between the original color gamut and the mapping target color gamut. According to the invention, the uniformity and detail level of the color points mapped on the boundary can be improved.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a color gamut mapping method and a color gamut mapping device. Background technique [0002] With the continuous development of science and technology, multimedia equipment gradually presents a trend of diversification. Different display devices have different color display methods, but the problem of color gamut mapping and matching between display devices is becoming more and more prominent. [0003] Such as figure 1 As shown, the commonly used HPMINDE algorithm at this stage, for the problem of over-color gamut, cuts all the colors outside the color gamut to the boundary of the target color gamut, and directly outputs the colors in the color gamut as they are. Such as figure 2 As shown, the points in the color gamut are output as they are, ensuring the accurate presentation of the colors in the color gamut; the points outside the color gamut are mapped along the direction t...

AI Technical Summary

Problems solved by technology

like figure 2 As shown, the points in the color gamut are output as they are, ensuring the accurate presentation of the colors in the color gamut; the points outside the color gamut are mapped along the direction towards the point on the brightness axis, and the colors in the out-of-gamut area are mapped on the boundary of the color gamut in turn, and the color gamut area and the mapping line segment exist The large difference directly results in poor mapping uniformity

[0004] For the color gamut mapping algorithm, especially in the process of mapping from a large color gamut to a small color gamut, the common algorithm maps the color points outside the small color gamut along a point on the brightness axis, such as a small area The color gamut ABHG is projected to the target area as AB, while the large-area color gamut EFJI is projected to the target area as EF, and EF is obviously shorter than AB, which causes problems such as insufficient mapping uniformity and insufficient color detail levels.

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