US 11,930,191 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)
Appl. No. 17/608,096
Filed by LG ELECTRONICS INC., Seoul (KR)
PCT Filed May 12, 2020, PCT No. PCT/KR2020/006205
§ 371(c)(1), (2) Date Nov. 1, 2021,
PCT Pub. No. WO2020/231139, PCT Pub. Date Nov. 19, 2020.
Claims priority of provisional application 62/848,606, filed on May 16, 2019.
Prior Publication US 2022/0329828 A1, Oct. 13, 2022
Int. Cl. H04N 19/186 (2014.01); H04N 19/132 (2014.01); H04N 19/169 (2014.01)
CPC H04N 19/186 (2014.11) [H04N 19/132 (2014.11); H04N 19/188 (2014.11)] 14 Claims
OG exemplary drawing
 
1. An image decoding method performed by a decoding apparatus, the method comprising:
obtaining image information including luma mapping with chroma scaling (LMCS) related information from a bitstream;
deriving at least one LMCS codeword for an LMCS process based on the LMCS related information;
generating reconstructed luma samples based on the at least one LMCS codeword; and
generating modified reconstructed luma samples based on the reconstructed luma samples and the at least one LMCS codeword,
wherein the LMCS related information includes information on linear mapping,
wherein the at least one LMCS codeword is derived based on signaling of the information on the linear mapping, and
wherein the at least one LMCS codeword is a multiple of two.