Color gamut border description method

Abstract

The invention provides a color gamut description method. The color gamut description method is characterized by including the following steps: step 1, expressing a to-be-described color gamut in a spherical coordinate system; step 2, separating a CIELAB standard color space into multiple subareas; step 3, searching a color sample point GBD point, of the outermost periphery of each subarea; step 4, calculating spherical coordinate values of a to-be-mapped color point P; step 5, calculating a projection point, of every GBD point, on a Psi face; step 6, calculating a direction angle, of every GBD point, on the Psi face; step 7, adjusting direction angles and hue angles of the GBD points; step 8, separating a general GBD point collection into four sub-collections; step 9, respectively calculating candidate GBD points of triangular interpolations in the four subareas; step 10, establishing a color point according to spherical coordinate values of the GBD point and P point with the minimum gamma values; step 11, selecting three candidate GBD points satisfying the triangular interpolations; step 12, calculating a color gamut boundary point P* corresponding to the P point according to the triangular interpolations; step 13, calculating color gamut boundary points corresponding to other to-be-mapped color points.

Description

technical field [0001] The invention relates to the field of computer image processing and color management, in particular to a method for describing the color gamut boundary of a color image and its display device and output device. Background technique [0002] Color management is a technology to ensure the accurate reproduction of color information when it is transmitted across media. Its core is to achieve the matching of different color spaces under the premise of correct color visualization, that is, color gamut mapping. The premise of the implementation of color gamut mapping is the accurate extraction and description of the color gamut boundary. [0003] M. Mahy proposed a partitioned color gamut description model based on the Niu-orderburg equation. The model decomposes the color gamut of an n-color output device into several sub-sections containing n-1 primary colors, and describes these sub-sections one by one to complete the overall color. Description of the fie...

AI Technical Summary

Problems solved by technology

J. Morovic proposed the partition maximum boundary description method, which divides the description of the color gamut boundary into two steps: the calculation of the color gamut boundary descriptor and the calculation of the line color gamut boundary, but the algorithm needs to be processed twice for the data in the specific implementation process Interpolation, one is to obtain the boundary point data of the corresponding partition through interpolation for the color gamut partition that does not have sampling points, and the other is to obtain the corresponding line color gamut boundary point through interpolation. In addition, the algorithm needs to interpolate when solving the line color gamut boundary The obtained line color gamut boundary points are fitted again. Excessive interpolation and fitting calculations introduce errors to a certain extent, which affects the accuracy of the color gamut boundary description

Images