Patent ID: 11924447
Assignee: LG ELECTRONICS INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 3:
4. A transmission method of data for an image, the method comprising:
obtaining a bitstream for the image, wherein the bitstream is generated based on generating prediction chroma samples for a current block in a current picture, generating residual chroma samples for the current block based on the prediction chroma samples, deriving luma mapping with chroma scaling (LMCS) codewords, deriving information on LMCS data based on the LMCS codewords, generating scaled residual chroma samples based on the residual chroma samples and the LMCS codewords, deriving residual information based on the scaled residual chroma samples, and encoding image information including the information on the LMCS data and the residual information; and
transmitting the data comprising the bitstream,
wherein the image information includes a sequence parameter set (SPS), information on an absolute value of a chroma residual scaling delta value and information on a sign of the chroma residual scaling delta value,
wherein the SPS includes an LMCS enabled flag representing whether an LMCS data field is enabled,
wherein the information on the LMCS data includes information on the LMCS codewords,
wherein the information on the sign of the chroma residual scaling delta value is included in the image information based on the information on the absolute value of the chroma residual scaling delta value,
wherein the information on the absolute value of the chroma residual scaling delta value and the information on the sign of the chroma residual scaling delta value represent a chroma residual scaling factor, and
wherein the scaled residual chroma samples are derived based on the chroma residual scaling factor.