Method and apparatus for video decoding, and method and apparatus for video encoding
AssigneeSamsung Electronics Co., Ltd.
InventorsNa-rae Choi, Bo-ra Jin
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Abstract
Provided are a method and apparatus for performing intra prediction, in a video encoding and decoding procedure, by configuring an additional mode set based on most probable mode (MPM) modes of a current block, and determining an intra prediction mode of the current block, based on the MPM modes and the additional mode set. To solve the technical problems, a video decoding method provided in the present disclosure includes configuring an additional mode set based on MPM modes of a current block; determining an intra prediction mode of the current block, based on the MPM modes and the additional mode set; and performing intra prediction on the current block, based on the intra prediction mode.
Claims2
A video decoding method comprising:
- configuring an additional mode set based on most probable mode (MPM) modes of a current block;
- if a flag, obtained from a bitstream, indicates that the additional mode set is used in determining an intra prediction mode of the current block, determining an additional mode among a plurality of additional modes included in the additional mode set as the intra prediction mode of the current;
- and performing intra prediction on the current block, based on the intra prediction mode of the current block,
- performing intra prediction on the current block, based on the intra prediction mode of the current block,
- wherein types of the MPM modes are all angular modes, the additional mode set comprises at least one of a DC mode, an intra prediction mode having an index increased by 1 from an index of one of the MPM modes, an intra prediction mode having an index decreased by 1 from the index of the one of the MPM modes, and an intra prediction mode having an index decreased by 2 from the index of the one of the MPM modes.
A video decoding apparatus comprising:
- a memory;
- and
- at least one processor connected with the memory,
- wherein the at least one processor is configured to
- configure an additional mode set based on most probable mode (MPM) modes of a current block,
- if a flag, obtained from a bitstream, indicates that the additional mode set is used in determining an intra prediction mode of the current block, determine an additional mode among a plurality of additional modes included in the additional mode set as the intra prediction mode of the current block, and
- perform intra prediction on the current block, based on the intra prediction mode of the current block,
- wherein, when the types of the MPM modes are all angular modes, the additional mode set comprises at least one of a DC mode, an intra prediction modes having an index increased by 1 from index of the one of the MPM modes, intra prediction modes having an index decreased by 1 from the index of the one of the MPM modes, and intra prediction modes having an index decreased by 2 from the index of the one of the MPM modes.
Dependencies are inferred from the claim text.