US 12,244,857 B2
Image decoding method and apparatus
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 Apr. 4, 2024, as Appl. No. 18/627,121.
Application 18/627,121 is a continuation of application No. 17/424,322, granted, now 11,991,390, previously published as PCT/KR2020/007813, filed on Jun. 17, 2020.
Claims priority of provisional application 62/863,257, filed on Jun. 18, 2019.
Prior Publication US 2024/0259594 A1, Aug. 1, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/593 (2014.01); H04N 19/11 (2014.01); H04N 19/132 (2014.01); H04N 19/136 (2014.01); H04N 19/176 (2014.01); H04N 19/70 (2014.01)
CPC H04N 19/593 (2014.11) [H04N 19/11 (2014.11); H04N 19/132 (2014.11); H04N 19/136 (2014.11); H04N 19/176 (2014.11); H04N 19/70 (2014.11)] 11 Claims
OG exemplary drawing
 
1. An image decoding method performed by a decoding apparatus, comprising:
obtaining image information including a Block-based Delta Pulse Code Modulation (BDPCM) constraint flag representing whether BDPCM is constrained for an image;
obtaining BDPCM related information for a current block, the BDPCM related information including at least one of a BDPCM flag representing whether the BDPCM is applied to the current block or a BDPCM direction flag representing a prediction direction for the current block; and
generating reconstructed samples for the current block based on the BDPCM related information,
wherein the BDPCM constraint flag equal to 1 represents that a constraint that a BDPCM enabled flag shall be equal to 0 is imposed, and the BDPCM constraint flag equal to 0 represents that the constraint is not imposed,
wherein the BDPCM enabled flag equal to 1 represents that the BDPCM is enabled and the BDPCM enabled flag equal to 0 represents that the BDPCM is not enabled,
wherein the BDPCM flag equal to 1 represents that the BDPCM is applied to the current block and the BDPCM flag equal to 0 represents that the BDPCM is not applied to the current block,
wherein the BDPCM direction flag is signaled based on the BDPCM flag being equal to 1,
wherein when the BDPCM constraint flag is equal to 1, the BDPCM enabled flag is equal to 0, and
wherein when the BDPCM enabled flag is equal to 0, the BDPCM flag is inferred to be equal to 0.