Search International and National Patent Collections

1. (WO2018202531) METHOD AND DEVICE FOR COLOR GAMUT MAPPING

Pub. No.:    WO/2018/202531    International Application No.:    PCT/EP2018/060702
Publication Date: Fri Nov 09 00:59:59 CET 2018 International Filing Date: Fri Apr 27 01:59:59 CEST 2018
IPC: H04N 1/60
Applicants: INTERDIGITAL VC HOLDINGS, INC.
Inventors: THEBAULT, Cédric
STAUDER, Jürgen
MAZZANTE, Angelo
Title: METHOD AND DEVICE FOR COLOR GAMUT MAPPING
Abstract:
The present principles relate to a method and device for gamut mapping from a first color gamut towards a second color gamut. The method comprises, in a plane of constant hue, mapping the chroma of the color from the first color gamut towards the second color gamut at constant lightness. The chroma mapping further comprises obtaining a target color on the second color gamut boundary wherein the lightness of the target color is greater than or equal to the lightness of a color of maximum chroma of the first color gamut and wherein the lightness of the target color is lower than the lightness of a color of maximum chroma of the second color gamut. In case where the lightness of the color is greater than the lightness of the target color, the chroma mapping comprises mapping at constant lightness the chroma of a color on the first color gamut boundary by a decreasing function of chroma applied to lightness, wherein the respective outputs of the decreasing function applied to the lightness of the target color and to the lightness of the white are the chroma of the target color and the chroma of the white.