US 12,273,558 B2
Intra prediction-based image coding method and apparatus using unified MPM list
Jin Heo, Seoul (KR); Sunmi Yoo, Seoul (KR); Ling Li, Seoul (KR); Jangwon Choi, Seoul (KR); and Jungah Choi, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Filed by LG ELECTRONICS INC., Seoul (KR)
Filed on Dec. 20, 2023, as Appl. No. 18/391,092.
Application 18/391,092 is a continuation of application No. 17/431,348, granted, now 11,902,572, previously published as PCT/KR2020/002764, filed on Feb. 26, 2020.
Claims priority of provisional application 62/810,389, filed on Feb. 26, 2019.
Prior Publication US 2024/0244257 A1, Jul. 18, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 7/12 (2006.01); H04N 19/105 (2014.01); H04N 19/11 (2014.01); H04N 19/132 (2014.01); H04N 19/176 (2014.01); H04N 19/593 (2014.01)
CPC H04N 19/593 (2014.11) [H04N 19/105 (2014.11); H04N 19/11 (2014.11); H04N 19/132 (2014.11); H04N 19/176 (2014.11)] 8 Claims
OG exemplary drawing
 
1. An image decoding apparatus, comprising:
a memory; and
at least one processor connected to the memory, the at least one processor configured to:
obtain reference line index information indicating whether a multi-reference line is used for intra prediction of a current block from a bitstream,
wherein a value of the reference line index information being equal to 0 represents that the multi-reference line is not used for the intra prediction of the current block, and
wherein the value of the reference line index information being not equal to 0 represents that the multi-reference line is used for the intra prediction of the current block;
derive Most Probable Mode (MPM) candidates of the current block, based on the value of the reference line index information;
derive an intra prediction mode for the current block based on the MPM candidates;
generate prediction samples for the current block based on the intra prediction mode; and
generate reconstructed samples for the current block based on the prediction samples,
wherein a number of the MPM candidates for the current block is variably determined depending on whether the multi-reference line is used for the intra prediction of the current block,
wherein based on the value of the reference line index information being not equal to 0, the number of the MPM candidates for the current block is determined as 5, and
wherein based on the value of the reference line index information being equal to 0, the number of the MPM candidates for the current block is determined as 6.