Patent ID: 11917136
Assignee: TENCENT AMERICA LLC
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 15:
16. An apparatus for intra prediction mode coding in video decoding, the apparatus comprising:
a memory storing instructions; and
a processor in communication with the memory, wherein, when the processor executes the instructions, the processor is configured to cause the apparatus to:
receive a coded video bitstream for a block;
divide a list of intra modes into a plurality of intra mode sets for the block based on mode information of each intra mode in the list, the list of intra modes corresponding to an intra prediction mode of at least one neighboring block of the block;
extract, from the coded video bitstream, a set index indicating an intra mode set from the plurality of intra mode sets;
extract, from the coded video bitstream, a mode index indicating an intra prediction mode from the intra mode set; and
determine the intra prediction mode for the block based on the set index and the mode index,

wherein the plurality of intra mode sets comprises one intra mode set and four intra mode sets, wherein:
the plurality of intra mode sets comprises, in an order of intra mode set indexes from smaller to larger, a first intra mode set, a second intra mode set, a third intra mode set, a fourth intra mode set, and a fifth intra mode set;
a number of intra prediction modes in the first intra mode set is one of the following: 5 or 7;
a number of intra prediction modes in the second intra mode set is 8;
a number of intra prediction modes in the third intra mode set is 16;
a number of intra prediction modes in the fourth intra mode set is 16; and
a number of intra prediction modes in the fifth intra mode set is 16.