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US 11,889,082 B2Granted
Video or image coding based on luma mapping and chroma scaling
AssigneeLG Electronics Inc.
InventorsJie Zhao, Seunghwan Kim
Life of this patent
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Abstract
According to disclosure of the present document, an LMCS procedure can be used for blocks having various block tree structures, and memories used in the LMCS procedure can be reduced (limited).
Claims16
An image decoding method performed by a decoding apparatus, the method comprising:
- obtaining image information including prediction mode information, residual information and luma mapping with chroma scaling (LMCS) related information from a bitstream;
- deriving an inter prediction mode for a current block in a current picture based on the prediction mode information;
- generating predicted luma samples based on the inter prediction mode;
- generating residual luma sample based on the residual information;
- generating mapped predicted luma samples based on a mapping process for luma samples;
- and
- generating 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,
- wherein the LMCS data field includes the LMCS related information,
- wherein LMCS codewords used in the mapping process and an inverse mapping process are derived based on the LMCS data field,
- wherein the mapped predicted luma samples are generated based on the LMCS codewords,
- wherein a maximum number of the LMCS APSs is a specific value, and
- wherein the specific value is 4.
11 more elements
An image encoding method performed by an encoding apparatus, the method comprising:
- deriving an inter prediction mode;
- generating predicted luma samples based on the inter prediction mode;
- generating luma mapping with chroma scaling (LMCS) related information;
- generating mapped predicted luma samples based on a mapping process for luma samples;
- generating residual samples based on the mapped predicted luma samples;
- generating residual information based on the residual samples;
- and
- encoding image information including the LMCS related information and the residual information,
- 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 process and the inverse mapping process are derived based on the LMCS data field,
- wherein the mapped predicted luma samples are generated based on the LMCS codewords,
- wherein a maximum number of the LMCS APSs is a specific value, and
- wherein the specific value is 4.
12 more elements
A transmission method of data for an image, the method comprising:
- obtaining a bitstream for the image, wherein the bitstream is generated based on deriving an inter prediction mode, generating predicted luma samples based on the inter prediction mode, generating luma mapping with chroma scaling (LMCS) related information, generating mapped predicted luma samples based on a mapping process for luma samples, generating residual samples based on the mapped predicted luma samples, generating residual information based on the residual samples, and encoding image information including the LMCS related information and the residual information;
- and
- transmitting the data comprising the bitstream,
- 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 process and the inverse mapping process are derived based on the LMCS data field,
- wherein the mapped predicted luma samples are generated based on the LMCS codewords,
- wherein a maximum number of the LMCS APSs is a specific value, and
- wherein the specific value is 4.
7 more elements
Dependencies are inferred from the claim text.