US 12,206,858 B2
Cross component prediction of chroma samples
Xinwei Li, Beijing (CN); Yan Ye, San Diego, CA (US); Ru-ling Liao, Beijing (CN); and Jie Chen, Beijing (CN)
Assigned to Alibaba (China) Co., Ltd., Hangzhou (CN)
Filed by Alibaba (China) Co., Ltd., Hangzhou (CN)
Filed on May 30, 2023, as Appl. No. 18/325,704.
Claims priority of provisional application 63/402,944, filed on Aug. 31, 2022.
Claims priority of provisional application 63/358,172, filed on Jul. 4, 2022.
Claims priority of provisional application 63/350,764, filed on Jun. 9, 2022.
Prior Publication US 2023/0403397 A1, Dec. 14, 2023
Int. Cl. H04N 19/132 (2014.01); H04N 19/105 (2014.01); H04N 19/176 (2014.01); H04N 19/186 (2014.01); H04N 19/70 (2014.01)
CPC H04N 19/132 (2014.11) [H04N 19/105 (2014.11); H04N 19/176 (2014.11); H04N 19/186 (2014.11); H04N 19/70 (2014.11)] 16 Claims
OG exemplary drawing
 
1. A video processing method, comprising:
determining a first value associated with a chroma sample, by applying a first gradient pattern to reconstructed values of a first plurality of luma samples;
determining a second value associated with the chroma sample, by applying a down-sampling filter to reconstructed values of a second plurality of luma samples; and
predicting the chroma sample based on the first value and the second value;
wherein predicting the chroma sample based on the first value and the second value comprises:
predicting the chroma sample based on a first parameter associated with the first value, a second parameter associated with the second value, and a third parameter;
wherein the predicting of the chroma sample is based on
predc(i, j)=a1·GL(i, j)+a2·rec′L(i, j)+a3, wherein:
(i, j) represents a coordinate of the chroma sample,
predc(i, j) is a predicted value of the chroma sample,
GL(i, j) is the first value,
rec′L(i, j) is the second value, and
α1, α2, and α3 are the first parameter, the second parameter, and the third parameter, respectively.