US 12,219,298 B2
Gamut mapping method and system
Xiaodong Zhang, Guangdong (CN)
Assigned to SHENZHEN TCL NEW TECHNOLOGY CO., LTD., Guangdong (CN)
Appl. No. 17/753,460
Filed by SHENZHEN TCL NEW TECHNOLOGY CO., LTD., Guangdong (CN)
PCT Filed Sep. 2, 2020, PCT No. PCT/CN2020/113021
§ 371(c)(1), (2) Date Mar. 3, 2022,
PCT Pub. No. WO2021/043164, PCT Pub. Date Mar. 11, 2021.
Claims priority of application No. 201910828423.5 (CN), filed on Sep. 3, 2019.
Prior Publication US 2022/0345675 A1, Oct. 27, 2022
Int. Cl. H04N 9/67 (2023.01); G09G 5/06 (2006.01); G09G 5/10 (2006.01)
CPC H04N 9/67 (2013.01) [G09G 5/06 (2013.01); G09G 5/10 (2013.01); G09G 2320/0626 (2013.01); G09G 2340/06 (2013.01); G09G 2360/16 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A gamut mapping method, wherein comprising:
building a three-dimensional gamut model of a transmission end and a three-dimensional gamut model of a display end separately;
obtaining a brightness value of each of sampling points corresponding to image data of the transmission end on a basis of a three-dimensional mapping table;
performing equal-brightness cutting on the three-dimensional gamut model of the transmission end and the three-dimensional gamut model of the display end separately on a basis of the brightness values of the sampling points, and forming corresponding equal-brightness two-dimensional surfaces; and
obtaining a two-dimensional gamut surface of a transmission gamut of equal-brightness and a two-dimensional surface of a display gamut of equal-brightness;
building a mapping relationship between the RGB coordinates of each sampling point on an equal-brightness two-dimensional surface of the transmission end and the RGB coordinates of each sampling point on an equal-brightness two-dimensional surface of the display end according to pre-stored RGB coordinates of white points corresponding to the transmission end, RGB coordinates of white points corresponding to the display end, linear RGB coordinates of each sampling point on the equal-brightness two-dimensional surface, coordinates of intersection of a connecting line composed of the white point and each sampling point with the equal-brightness two-dimensional surface of the transmission end, and coordinates of intersection of the connecting line with the equal-brightness two-dimensional surface of the display end; and
mapping the RGB coordinates of each sampling point of the transmission end to the equal-brightness two-dimensional surface of the display end according to the mapping relationship.