US 11,818,370 B2
Luma mapping-based video or image coding
Jie Zhao, Seoul (KR); and Seunghwan Kim, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Filed by LG ELECTRONICS INC., Seoul (KR)
Filed on Jun. 22, 2022, as Appl. No. 17/846,692.
Application 17/846,692 is a continuation of application No. 17/559,130, filed on Dec. 22, 2021, granted, now 11,412,239.
Application 17/559,130 is a continuation of application No. PCT/KR2020/008144, filed on Jun. 24, 2020.
Claims priority of provisional application 62/865,922, filed on Jun. 24, 2019.
Prior Publication US 2022/0329830 A1, Oct. 13, 2022
Int. Cl. H04N 19/186 (2014.01); H04N 19/132 (2014.01); H04N 19/136 (2014.01); H04N 19/176 (2014.01); H04N 19/70 (2014.01)
CPC H04N 19/186 (2014.11) [H04N 19/132 (2014.11); H04N 19/136 (2014.11); H04N 19/176 (2014.11); H04N 19/70 (2014.11)] 20 Claims
OG exemplary drawing
 
1. An image decoding apparatus, comprising:
an entropy decoder for obtaining image information including prediction related information and luma mapping with chroma scaling (LMCS) related information from a bitstream;
a predictor for generating prediction luma samples for a current block in a current picture based on the prediction related information, for deriving LMCS codewords based on the LMCS related information, and for generating mapped prediction luma samples based on the prediction luma samples and the LMCS codewords; and
an adder for generating reconstructed luma samples for the current block based on the mapped prediction luma samples,
wherein the image information includes adaptation parameter sets (APSs),
wherein each of the APS s includes type information specifying whether the APS is an LMCS APS,
wherein an LMCS data field included in the APS of which the type information specifies the LMCS APS includes the LMCS related information,
wherein the LMCS codewords are derived based on the LMCS data field, and
wherein an ID value of the APS of which the type information specifies the LMCS APS is in a predetermined range.