US 11,871,033 B2
Method and apparatus for chroma intra prediction in video coding
Alexey Konstantinovich Filippov, Moscow (RU); Vasily Alexeevich Rufitskiy, Moscow (RU); and Jianle Chen, San Diego, CA (US)
Assigned to HUAWEI TECHNOLOGIES CO., LTD., Guangdong (CN)
Filed by Huawei Technologies Co., Ltd., Guangdong (CN)
Filed on Jul. 12, 2021, as Appl. No. 17/373,347.
Application 17/373,347 is a continuation of application No. PCT/RU2020/050059, filed on Mar. 24, 2020.
Claims priority of provisional application 62/822,981, filed on Mar. 24, 2019.
Prior Publication US 2021/0344953 A1, Nov. 4, 2021
Int. Cl. H04N 19/593 (2014.01); H04N 19/11 (2014.01); H04N 19/159 (2014.01); H04N 19/172 (2014.01); H04N 19/186 (2014.01)
CPC H04N 19/593 (2014.11) [H04N 19/11 (2014.11); H04N 19/159 (2014.11); H04N 19/172 (2014.11); H04N 19/186 (2014.11)] 20 Claims
OG exemplary drawing
 
1. A method of directional intra prediction for chroma component of a picture, the method comprising:
obtaining an initial intra prediction mode of the chroma component of the picture;
deriving a chroma intra prediction mode (intraPredModeC) from a look up table (LUT) by using the initial intra prediction mode of the chroma component, wherein a horizontal direction of the chroma component (SubWidthC) is different from a vertical direction of the chroma component (SubHeightC);
performing wide-angle mapping on the intraPredModeC to obtain a modified intraPredModeC;
obtaining an angle parameter for the chroma component based on the modified intraPredModeC; and
obtaining predicted samples of the chroma component based on the angle parameter.