US 12,120,323 B2
Luma mapping-and chroma scaling-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. 23, 2023, as Appl. No. 18/213,614.
Application 18/213,614 is a continuation of application No. 17/853,346, filed on Jun. 29, 2022, granted, now 11,729,404.
Application 17/853,346 is a continuation of application No. 17/561,409, filed on Dec. 23, 2021, granted, now 11,470,333.
Application 17/561,409 is a continuation of application No. PCT/KR2020/008145, filed on Jun. 24, 2020.
Claims priority of provisional application 62/865,918, filed on Jun. 24, 2019.
Prior Publication US 2023/0336750 A1, Oct. 19, 2023
Int. Cl. H04N 19/186 (2014.01); H04N 19/109 (2014.01); H04N 19/159 (2014.01); H04N 19/172 (2014.01); H04N 19/96 (2014.01)
CPC H04N 19/186 (2014.11) [H04N 19/109 (2014.11); H04N 19/159 (2014.11); H04N 19/172 (2014.11); H04N 19/96 (2014.11)] 3 Claims
OG exemplary drawing
 
1. A decoding apparatus for image decoding, the decoding apparatus comprising:
a memory; and
at least one processor connected to the memory, the at least one processor configured to:
obtain image information including prediction mode information, residual information and luma mapping with chroma scaling (LMCS) related information from a bitstream;
derive an inter prediction mode for a current block in a current picture based on the prediction mode information;
generate predicted luma samples based on the inter prediction mode;
generate mapped predicted luma samples based on a mapping process for luma samples;
derive residual luma samples based on the residual information; and
generate reconstructed luma samples based on the mapped predicted luma samples and the residual luma samples,
wherein the image information includes LMCS adaptation parameter sets (APSs),
wherein an LMCS APS includes an LMCS data field and ID information,
wherein the LMCS data field includes the LMCS related information,
wherein LMCS codewords used in the mapping process are derived based on the LMCS data field,
wherein a value of the ID information is in a predetermined range, and
wherein the predetermined range is a range of 0 to 3.