US 11,991,390 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)
Appl. No. 17/424,322
Filed by LG Electronics Inc., Seoul (KR)
PCT Filed Jun. 17, 2020, PCT No. PCT/KR2020/007813
§ 371(c)(1), (2) Date Jul. 20, 2021,
PCT Pub. No. WO2020/256391, PCT Pub. Date Dec. 24, 2020.
Claims priority of provisional application 62/863,257, filed on Jun. 18, 2019.
Prior Publication US 2022/0159294 A1, May 19, 2022
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)] 14 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 in the image, 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 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 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 nag is inferred to be equal to 0.