US 12,316,864 B1
Neutral color preservation for single-layer backward compatible codec
Guan-Ming Su, Fremont, CA (US); and Tsung-Wei Huang, Fremont, CA (US)
Assigned to Dolby Laboratories Licensing Corporation, San Francisco, CA (US)
Appl. No. 18/865,902
Filed by Dolby Laboratories Licensing Corporation, San Francisco, CA (US)
PCT Filed May 17, 2023, PCT No. PCT/US2023/022581
§ 371(c)(1), (2) Date Nov. 14, 2024,
PCT Pub. No. WO2023/229898, PCT Pub. Date Nov. 30, 2023.
Claims priority of provisional application 63/345,161, filed on May 24, 2022.
Claims priority of application No. 22175096 (EP), filed on May 24, 2022.
Int. Cl. H04N 19/00 (2014.01); G06T 5/40 (2006.01); G06T 7/00 (2017.01); G06T 7/90 (2017.01); H04N 19/186 (2014.01); H04N 19/98 (2014.01)
CPC H04N 19/186 (2014.11) [G06T 5/40 (2013.01); G06T 7/90 (2017.01); H04N 19/98 (2014.11)] 15 Claims
OG exemplary drawing
 
1. A method for encoding image data with neutral color preservation, the method comprising:
building a dynamic 3D mapping table (d3DMT) from a first reference image and a second reference image, the first reference image having a different dynamic range than the second reference image;
computing content color matrices based on the d3DMT;
computing a content saturation from the d3DMT;
computing at least one weighting factor from the content saturation;
building a neutral color set comprising a plurality of neutral color image patches;
computing neutral color matrices based on the neutral color set;
combining the content color matrices, the at least one weighting factor, and the neutral color matrices to solve multiple-channel multiple regression (MMR) coefficients; and
providing metadata containing data related to the MMR coefficients to a decoder to allow backward compatibility for a single-layer bitstream.