Patent ID: 11924439
Assignee: GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 5:
6. A chroma intra prediction method, applied to an encoder, the method comprising:
encoding bitstream data corresponding to a current block, and determining that a prediction mode corresponding to a chroma component of the current block is a direct mode (DM);
determining an intra prediction mode of a chroma component of the current block from a set of chroma prediction modes, wherein the set of chroma prediction modes comprises at least one of the DM derived modes, LM, LMT or LM_L,
wherein when a luma prediction mode corresponding to the current block is a direct current (DC) mode or a planar mode, the DM derived modes comprise at least one modified candidate mode; and
the at least one modified candidate mode is of a prediction direction with a first angle from a prediction direction of a mode with an index 66 in a first angular direction, and the prediction direction of a mode with an index 66 points in a top-right direction; or the at least one modified candidate mode is of a prediction direction with the first angle from a prediction direction of a mode with an index 2 in a direction opposite to the first angular direction, and the prediction direction of a mode with an index 2 points in a bottom-left direction; and
determining a reconstructed value of the current chroma block according to the intra prediction mode.