Color gamut mapping method and color gamut mapping device

Abstract

The invention provides a color gamut mapping method and a color gamut mapping device. The method comprises the following steps: obtaining a Lab values of a color point in an original color gamut, determining a coordinate position of the color point in a tone plane corresponding to the original color gamut according to the Lab value, and judging a color point mapping target area according to the coordinate position; judging whether the color point is beyond the mapping target area according to the coordinate position; if the color point is beyond the mapping target area, determining a first cross point of a connecting line of the color point and a maximum luminance midpoint with a boundary line of the mapping target area, and a second cross point of the boundary line of the mapping target area corresponding to the color point; and finally determining a mapping point of the color point on the boundary line of the mapping target area according to preset adjustment parameters. By means ofthe manner, the uniformity and detail level problems of the mapping on the boundary color point are improved. In addition, the minimum chromatic aberration change, the minimum luminance change and theoptimal minimum color change can also be achieved by modifying the adjustment parameters.

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] like 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. 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 toward ...

AI Technical Summary

Problems solved by technology

[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, and the area and the mapping line segment There is a large difference, which directly leads to poor mapping uniformity. At the same time, after image mapping, it is easy to concentrate the level of detail information in a small range, and it is easy to cause blurring and halo noise.

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