Method and apparatus for coding video and method apparatus for decoding video, accompanied with intra prediction

摘要

A video decoding method involving intra prediction includes: parsing a most probable mode (MPM) flag of a block while parsing symbols of the block of an encoded video from a received bitstream; determining whether a predetermined number of a plurality of candidate intra prediction modes are used to predict an intra prediction mode of the block based on the MPM flag; when it is determined that the plurality of candidate intra prediction modes are used based on the MPM flag, determining the plurality of candidate intra prediction modes based on intra prediction modes of a left block and an upper block that are adjacent to the block while restoring the intra prediction mode of the block by using the parsed symbols.

主权项

1. A method of decoding video data controlled by a processor, the method comprising:
determining, by the processor, candidate intra prediction modes including a planar mode, in response to an intra prediction mode of a left block being equal to an intra prediction mode of an upper block and the intra prediction mode of the left block being a DC mode; determining, by the processor, the candidate intra prediction modes including an intra prediction mode corresponding to an index that is less than an index of the intra prediction mode of the left block by 1 or an intra prediction mode corresponding to an index that is greater than the index of the intra prediction mode of the left block by 1, in response to the intra prediction mode of the left block being equal to the intra prediction mode of the upper block and the intra prediction mode of the left block being a directional mode; obtaining, by the processor, a mode index indicating one among the candidate intra prediction modes from a bitstream; determining, by the processor, an intra prediction mode of a current block by using the mode index; and, performing, by the processor, intra prediction on the current block using the intra prediction mode of the current block.