US 11,722,681 B2
Video or image coding based on mapping of luma samples and scaling of chroma samples
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 Jul. 8, 2022, as Appl. No. 17/860,625.
Application 17/860,625 is a continuation of application No. 17/560,461, filed on Dec. 23, 2021, granted, now 11,418,799.
Application 17/560,461 is a continuation of application No. PCT/KR2020/008208, filed on Jun. 24, 2020.
Claims priority of provisional application 62/865,921, filed on Jun. 24, 2019.
Prior Publication US 2022/0353518 A1, Nov. 3, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/86 (2014.01); H04N 19/132 (2014.01); H04N 19/176 (2014.01); H04N 19/169 (2014.01); H04N 19/70 (2014.01); H04N 19/96 (2014.01); H04N 19/186 (2014.01); H04N 19/117 (2014.01)
CPC H04N 19/186 (2014.11) [H04N 19/132 (2014.11); H04N 19/176 (2014.11); H04N 19/1887 (2014.11); H04N 19/70 (2014.11); H04N 19/96 (2014.11); H04N 19/117 (2014.11)] 11 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 residual information and information on luma mapping with chroma scaling (LMCS) data from a bitstream;
generate mapped predicted luma samples based on the information on the LMCS data and predicted 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; and
generate modified reconstructed luma samples based on the reconstructed luma samples and the information on the LMCS data,
wherein:
the image information includes LMCS adaptation parameter sets (APSs);
an LMCS APS includes identifier information of the LMCS APS, and type information indicating that the LMCS APS is an APS including an LMCS data field;
the LMCS data field includes the information on the LMCS data;
the LMCS APS includes the LMCS data field based on the type information;
LMCS codewords are derived based on the LMCS data field;
the mapped predicted luma samples and the modified reconstructed luma samples are generated based on the LMCS codewords;
a value of the identifier information is in a predetermined range;
the image information includes header information;
the header information includes LMCS related APS ID information;
the LMCS related APS ID information represents the identifier information of the LMCS APS; and
a value of the LMCS related APS ID information is in a range of 0 to 3.