CPC H04N 19/126 (2014.11) [H04N 19/70 (2014.11)] | 19 Claims |
1. A method, comprising:
obtaining a single identifier used to identify a quantization matrix from a plurality of quantization matrices, based on a size identifier, a color component type, and a prediction mode parameter of a block to be decoded in a picture, wherein said single identifier is derived based on N*sizeId+matrixTypeId, where matrixTypeId indicates said color component type and said prediction mode parameter of said block, N is a number of possible type identifiers indicated by matrixTypeId, and sizeId indicates said size identifier;
decoding a syntax element indicating a reference quantization matrix, wherein said syntax element specifies a difference between an identifier of said reference quantization matrix and said obtained identifier for said quantization matrix;
obtaining said quantization matrix based on said reference quantization matrix;
de-quantizing transform coefficients for said block based on said quantization matrix; and
decoding said block based on said de-quantized transform coefficients.
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