CPC H04N 19/105 (2014.11) [H04N 19/11 (2014.11); H04N 19/119 (2014.11); H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/186 (2014.11); H04N 19/46 (2014.11); H04N 19/593 (2014.11); H04N 19/70 (2014.11)] | 16 Claims |
1. An image decoding method performed by a decoding apparatus comprising:
receiving information about an intra prediction type of a current block through a bitstream;
deriving the intra prediction type of the current block as a specific intra prediction type based on the information about the intra prediction type;
acquiring information about an intra prediction mode of the current block from the bitstream;
configuring a most probable mode (MPM) list comprising candidate intra prediction modes of the current block based on neighboring blocks of the current block;
deriving the intra prediction mode of the current block based on the MPM list and the information about the intra prediction mode;
generating a predicted block of the current block by performing intra prediction based on the specific intra prediction type and the derived intra prediction mode;
acquiring residual information from the bitstream;
generating a residual block based on the residual information; and
generating a reconstructed block configuring a reconstructed picture based on the residual block and the predicted block derived based on the specific intra prediction type and the derived intra prediction mode,
wherein for the specific intra prediction type, the intra prediction is performed based on neighboring reference samples in a specific sample line which is not adjacent to a top boundary and a left boundary of the current block,
wherein, based on the intra prediction type representing the specific intra prediction type, the information about the intra prediction mode comprises MPM index information,
wherein based on the intra prediction type representing the specific intra prediction type, the MPM index information is parsed without parsing an MPM flag information from the bitstream, and
wherein, for generating the predicted block based on the specific intra prediction type and the derived intra prediction mode, neighboring reference samples used based on a height of the current block being greater than a width of the current block are different from neighboring reference samples used based on the width of the current block being greater than the height of the current block.
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