US 11,695,925 B2
Intra prediction-based image coding method and apparatus using MPM list
Ling Li, Seoul (KR); Jin Heo, Seoul (KR); Seunghwan Kim, Seoul (KR); Sunmi Yoo, 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 Aug. 9, 2022, as Appl. No. 17/884,131.
Application 17/884,131 is a continuation of application No. 17/179,639, filed on Feb. 19, 2021, granted, now 11,470,305.
Application 17/179,639 is a continuation of application No. 16/815,884, filed on Mar. 11, 2020, granted, now 10,965,940, issued on Mar. 30, 2021.
Application 16/815,884 is a continuation of application No. PCT/KR2019/013072, filed on Oct. 4, 2019.
Claims priority of provisional application 62/742,975, filed on Oct. 9, 2018.
Claims priority of provisional application 62/742,242, filed on Oct. 5, 2018.
Prior Publication US 2022/0394245 A1, Dec. 8, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/105 (2014.01); H04N 19/11 (2014.01); H04N 19/159 (2014.01); H04N 19/132 (2014.01); H04N 19/176 (2014.01); H04N 19/46 (2014.01); H04N 19/70 (2014.01); H04N 19/119 (2014.01); H04N 19/593 (2014.01)
CPC H04N 19/105 (2014.11) [H04N 19/11 (2014.11); H04N 19/119 (2014.11); H04N 19/132 (2014.11); H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/46 (2014.11); H04N 19/593 (2014.11); H04N 19/70 (2014.11)] 13 Claims
OG exemplary drawing
 
1. A video decoding method performed by a decoding apparatus, the method comprising:
constructing candidate mode list by deriving candidate modes for a current block based on neighboring blocks adjacent to the current block, wherein the neighboring blocks comprises a left neighboring block and an upper neighboring block;
deriving an intra prediction mode for the current block based on the candidate mode list;
generating predicted samples by performing prediction for the current block based on the intra prediction mode; and
generating a reconstructed picture for the current block based on the predicted samples,
wherein the step of constructing the candidate mode list includes:
checking a condition 1 whether an intra prediction mode of the left neighboring block and an intra prediction mode of the upper neighboring block are the same intra prediction mode;
checking a condition 2 whether a mode number of the intra prediction mode of the left neighboring block is greater than a mode number of a DC mode, based on a case where the condition 1 is satisfied;
checking a condition 3 whether the mode number of the intra prediction mode of the left neighboring block and a mode number of the intra prediction mode of the upper neighboring block are greater than the mode number of the DC mode, based on a case where the condition 1 is not satisfied;
checking a condition 4 whether a difference between the mode number of the intra prediction mode of the left neighboring block and the mode number of the intra prediction mode of the upper neighboring block is equal to 1, based on a case where the condition 3 is satisfied;
checking a condition 5 whether one of the mode number of the intra prediction mode of the left neighboring block and the mode number of the intra prediction mode of the upper neighboring block is greater than the mode number of the DC mode, based on a case where the condition 3 is not satisfied;
constructing the candidate mode list based on at least one of the condition 1 to the condition 5,
wherein the step of deriving the intra prediction mode for the current block includes:
obtaining Most Probable Mode (MPM) flag information related to whether the intra prediction mode for the current block is included among the candidate modes;
obtaining remaining mode information for indicating the intra prediction mode for the current block among remaining intra prediction modes except for the candidate modes, based on the MPM flag information representing that the intra prediction mode for the current block is not included among the candidate modes; and
deriving the intra prediction mode for the current block based on the remaining mode information,
wherein the remaining mode information is obtained based on a truncated binary (TB) binarization process.