Patent ID: 11917140
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A video decoding method comprising:
obtaining most probable mode (MPM) flag indicating whether to use any one among a plurality of intra prediction modes included in MPMs of a current block, wherein the MPMs include an intra prediction mode of a left neighboring block of the current block and an intra prediction mode of an upper neighboring block of the current block;
when the MPM flag indicates not to use any one among the plurality of intra prediction modes included in the MPMs of the current block, obtaining an extended intra mode flag indicating whether to use one among a plurality of intra prediction modes included in an extended intra mode list or one among a plurality of remaining intra prediction modes as an intra prediction mode of the current block;
configuring the extended intra mode list using the plurality of intra prediction modes included in the MPMs of the current block;
when the extended intra mode flag indicates to use one among the plurality of intra prediction modes included in the extended intra mode list as the intra prediction mode of the current block, determining an intra prediction mode among the plurality of intra prediction modes included in the extended intra mode list to be the intra prediction mode of the current block;
when the extended intra mode flag indicates to use one among the plurality of remaining intra prediction modes as the intra prediction mode of the current block, determining an intra prediction mode among the plurality of remaining intra prediction modes to be the intra prediction mode of the current block; and
performing intra prediction on the current block using the intra prediction mode of the current block,
wherein when an intra prediction mode of a right neighboring block of the current block is a first directional mode, the extended intra mode list includes the first directional mode, an intra prediction mode of an index increased by 1 from an index of the first directional mode, and an intra prediction mode of an index decreased by 1 from the index of the first directional mode.