US 12,294,713 B2
Video or image coding based on luma mapping and chroma scaling
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 Dec. 11, 2023, as Appl. No. 18/535,517.
Application 18/535,517 is a continuation of application No. 17/960,986, filed on Oct. 6, 2022, granted, now 11,889,082.
Application 17/960,986 is a continuation of application No. 17/556,551, filed on Dec. 20, 2021, granted, now 11,496,742.
Application 17/556,551 is a continuation of application No. PCT/KR2020/008053, filed on Jun. 22, 2020.
Claims priority of provisional application 62/864,483, filed on Jun. 20, 2019.
Prior Publication US 2024/0146930 A1, May 2, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/00 (2014.01); H04N 19/109 (2014.01); H04N 19/132 (2014.01); H04N 19/159 (2014.01); H04N 19/176 (2014.01); H04N 19/186 (2014.01); H04N 19/70 (2014.01)
CPC H04N 19/132 (2014.11) [H04N 19/109 (2014.11); H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/186 (2014.11); H04N 19/70 (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 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 procedure for luma samples; and
generate modified reconstructed luma samples based on an inverse mapping procedure for luma samples,
wherein the image information includes LMCS adaptation parameter sets (APSs),
wherein an LMCS APS includes an LMCS data field,
wherein the LMCS data field includes the LMCS related information,
wherein LMCS codewords used in the mapping procedure and the inverse mapping procedure are derived based on the LMCS data field,
wherein a maximum number of the LMCS APSs is a predetermined value, and
wherein the predetermined value is 4.