| CPC H04N 19/30 (2014.11) [H04N 19/103 (2014.11); H04N 19/124 (2014.11); H04N 19/132 (2014.11); H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/18 (2014.11); H04N 19/70 (2014.11)] | 4 Claims |
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1. An image decoding method performed by a decoding apparatus, the method comprising:
obtaining image information including prediction mode information and residual information from a bitstream;
deriving prediction samples for a current block based on the prediction mode information;
deriving quantized transform coefficients for the current block based on the residual information;
deriving transform coefficients based on the quantized transform coefficients;
deriving residual samples based on the transform coefficients; and
generating reconstruction samples based on the prediction samples and the residual samples,
wherein the transform coefficients are derived by applying a dequantization process to the quantized transform coefficients based on scaling list data,
wherein the image information includes a sequence parameter set (SPS),
wherein the SPS includes first enabled flag information related to whether the scaling list data is used,
wherein, based on the first enabled flag information being signaled in the SPS, the scaling list data is included in an adaptation parameter set (APS),
wherein the APS including the scaling list data is identified based on APS ID information,
wherein the APS ID information is related to representing identification information of the APS including the scaling list data and is obtained from header information,
wherein the APS further includes APS type information,
wherein the APS type information represents one of APS types including a first APS type related to adaptive loop filter (ALF), a second APS type related to luma mapping with chroma scaling (LMCS), and a third APS type related to the scaling list data, and
wherein, based on the APS type information representing the third APS type, the scaling list data is included in the APS.
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