Patent ID: 11924414
Assignee: GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 10:
11. A decoder, comprising a memory and a processor, wherein
the memory is configured to store computer programs capable of running in the processor; and
the processor is configured to run the computer programs to execute:
determining an intra prediction mode of a current block, wherein the intra prediction mode of the current block is determined for each of a luma block and a chroma block respectively, the intra prediction mode of the luma block is derived based on an MPM (Most Probable Mode) list and an MPM index, and the MPM list includes an intra prediction mode of a neighboring block (ModeA), ModeA+n, and ModeA−n; and
performing intra prediction on the current block based on the intra prediction mode;
wherein the processor is further configured to run the computer programs to execute:
specifying a luma region for inter-components reference of the chroma block;
performing down-sampling for the luma region;
deriving a parameter for the inter-components reference of the chroma block; and
predicting the chroma block based on the down-sampled luma region and the parameter;
wherein the luma region comprises a luma block and a neighboring region adjacent to the luma block, and performing down-sampling for the luma region comprises:
performing down-sampling for the neighboring region adjacent to the luma block based on:

pLeftDsY[y]=(pY[−2][2×y−1]+pY[−3][2×y]+4×pY[−2][2×y]+pY[−1][2×y]+pY[−2][2×y+1]+4)>>3.