CPC H04N 19/124 (2014.11) [H04N 19/132 (2014.11); H04N 19/186 (2014.11); H04N 19/70 (2014.11)] | 13 Claims |
1. An image decoding method, performed by a decoding apparatus, comprising:
receiving a flag representing whether quantization parameter data for combined chroma coding is present, based on a chroma type;
receiving the quantization parameter data for the combined chroma coding based on the flag;
receiving quantization parameter offset information for the combined chroma coding;
deriving a chroma quantization parameter table based on the quantization parameter data;
deriving a quantization parameter for the combined chroma coding based on the chroma quantization parameter table and the quantization parameter offset information;
deriving residual samples based on the quantization parameter; and
generating a reconstructed picture based on the residual samples,
wherein the quantization parameter data includes a syntax element for a starting quantization parameter of the chroma quantization parameter table and a syntax element for a number of quantization parameters in the chroma quantization parameter table.
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