US 12,231,655 B2
Chroma intra prediction method and device
Junyan Huo, Guangdong (CN); Yanzhuo Ma, Guangdong (CN); Shuai Wan, Guangdong (CN); Fuzheng Yang, Guangdong (CN); and Xinwei Li, Guangdong (CN)
Assigned to GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD., Guangdong (CN)
Filed by GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD., Guangdong (CN)
Filed on Oct. 24, 2023, as Appl. No. 18/493,496.
Application 18/493,496 is a continuation of application No. 17/819,175, filed on Aug. 11, 2022, granted, now 11,924,439.
Application 17/819,175 is a continuation of application No. 17/361,625, filed on Jun. 29, 2021, granted, now 11,451,792, issued on Sep. 20, 2022.
Application 17/361,625 is a continuation of application No. PCT/CN2019/070148, filed on Jan. 2, 2019.
Prior Publication US 2024/0098274 A1, Mar. 21, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/105 (2014.01); H04N 19/159 (2014.01); H04N 19/176 (2014.01); H04N 19/186 (2014.01)
CPC H04N 19/159 (2014.11) [H04N 19/105 (2014.11); H04N 19/176 (2014.11); H04N 19/186 (2014.11)] 8 Claims
OG exemplary drawing
 
1. A chroma intra prediction method, applied to a decoder, the method comprising:
parsing bitstream data corresponding to a current chroma block, and determining that a prediction mode corresponding to the current chroma block is a direct mode (DM);
before determining a set of chroma prediction modes based on at least one modified candidate mode, acquiring a linear mode corresponding to the current chroma block from the bitstream data;
determining an intra prediction mode of the current chroma block from the set of chroma prediction modes, wherein the set of chroma prediction modes comprises at least one of the DM, linear mode (LM), LM_T or LM_L, wherein when a luma prediction mode corresponding to the DM is a direct current (DC) mode or a planar mode, the set of chroma prediction modes comprises a diagonal angular mode with prediction direction index number 66,
determining a reconstructed value of the current chroma block according to the intra prediction mode.