US 11,968,392 B2
Image decoding method and device thereof
Sunmi Yoo, Seoul (KR); Junghak Nam, Seoul (KR); and Jungah Choi, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Filed by LG ELECTRONICS INC., Seoul (KR)
Filed on Oct. 28, 2022, as Appl. No. 17/976,307.
Application 17/976,307 is a continuation of application No. 17/612,186, granted, now 11,523,134, previously published as PCT/KR2020/006703, filed on May 22, 2020.
Claims priority of provisional application 62/851,624, filed on May 22, 2019.
Prior Publication US 2023/0060599 A1, Mar. 2, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/70 (2014.01); H04N 19/159 (2014.01); H04N 19/176 (2014.01); H04N 19/593 (2014.01)
CPC H04N 19/593 (2014.11) [H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/70 (2014.11)] 12 Claims
OG exemplary drawing
 
1. An image decoding method, performed by a decoding apparatus, comprising:
obtaining a Block-based Delta Pulse Code Modulation (BDPCM) flag for a current block;
obtaining a BDPCM direction flag for the current block based on the BDPCM flag representing that BDPCM is applied to the current block; and
deriving a prediction sample of a target sample of the current block based on a prediction direction derived based on the BDPCM direction flag;
wherein an intra prediction mode of the prediction direction is derived based on the BDPCM direction flag as an intra prediction mode of the current block,
wherein the BDPCM direction flag represents a horizontal direction or a vertical direction as the prediction direction,
wherein based on the BDPCM being applied to the current block and the prediction direction for the current block being the vertical direction, residual information includes syntax elements for the target sample of the current block, and
wherein the syntax elements for the target sample represent a difference between a residual coefficient value of the target sample and a top residual coefficient value of the target sample.