US 11,943,432 B2
Decoder side intra mode derivation
Ling Li, Seoul (KR); Xiang Li, Saratoga, CA (US); and Shan Liu, San Jose, CA (US)
Assigned to TENCENT AMERICA LLC, Palo Alto, CA (US)
Filed by Tencent America LLC, Palo Alto, CA (US)
Filed on Apr. 22, 2022, as Appl. No. 17/727,563.
Claims priority of provisional application 63/179,902, filed on Apr. 26, 2021.
Prior Publication US 2022/0345691 A1, Oct. 27, 2022
Int. Cl. H04N 19/119 (2014.01); H04N 19/105 (2014.01); H04N 19/159 (2014.01); H04N 19/176 (2014.01); H04N 19/70 (2014.01)
CPC H04N 19/105 (2014.11) [H04N 19/119 (2014.11); H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/70 (2014.11)] 18 Claims
OG exemplary drawing
 
1. A method of video decoding performed in a video decoder, the method comprising:
receiving coded information of a current block and neighboring blocks of the current block from a coded video bitstream;
obtaining first information associated with the current block in the coded information, the first information indicating whether the current block is intra predicted based on decoder side intra mode derivation (DIMD) in which an intra prediction mode of the current block is derived based on the neighboring blocks;
obtaining second information associated with the current block and the neighboring blocks in the coded information, the second information indicating whether the current block and one or more of the neighboring blocks are partitioned based on an intra sub-partition (ISP) mode;
setting a context model index to a first value in response to (i) the first information indicating that the current block is intra predicted based on the DIMD, and (ii) the second information indicating that an above adjacent block or a left adjacent block of the current block in the neighboring blocks is partitioned based on the ISP mode; and
decoding the current block from the coded video bitstream based at least on the context model index.