US 11,706,405 B2
Image/video coding method based on intra prediction involving parsing of MPM index, and apparatus thereof
Jin Heo, Seoul (KR); Sunmi Yoo, Seoul (KR); Ling Li, Seoul (KR); and Jangwon Choi, Seoul (KR)
Assigned to LG Electronics Inc., Seoul (KR)
Appl. No. 16/982,411
Filed by LG Electronics Inc., Seoul (KR)
PCT Filed Mar. 27, 2019, PCT No. PCT/KR2019/003534
§ 371(c)(1), (2) Date Sep. 18, 2020,
PCT Pub. No. WO2019/190181, PCT Pub. Date Oct. 3, 2019.
Claims priority of provisional application 62/655,773, filed on Apr. 10, 2018.
Claims priority of application No. 10-2018-0037749 (KR), filed on Mar. 30, 2018.
Prior Publication US 2021/0076028 A1, Mar. 11, 2021
Int. Cl. H04N 19/105 (2014.01); H04N 19/159 (2014.01); H04N 19/176 (2014.01); H04N 19/186 (2014.01); H04N 19/46 (2014.01); H04N 19/11 (2014.01); H04N 19/119 (2014.01); H04N 19/593 (2014.01); H04N 19/70 (2014.01)
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
OG exemplary drawing
 
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.