METHOD AND EQUIPMENT FOR IMAGE ENCODING/DECODING USING QUANTIZATION MATRIX AND METHOD FOR BITSTREAM TRANSMISSION Russian patent published in 2023 - IPC H04N19/124 H04N19/186 H04N19/105 

FIELD: encoding/decoding images.

SUBSTANCE: image decoding method by means of image decoding equipment is provided, comprising obtaining quantization mode information for a current block from a bitstream, determining whether or not a quantization matrix is constructed for the current block from a reference quantization matrix based on the quantization mode information, and constructing a quantization matrix for the current block, based on the result of the determination. When the quantization matrix for the current block is constructed from the reference quantization matrix, the quantization matrix for the current block may be constructed based on the identification information of the reference quantization matrix. When the quantization matrix for the current block is not constructed from the reference quantization matrix, the quantization matrix for the current block may be constructed based on the value of the quantization matrix obtained from the bitstream. When the current block is an intra-predicted chrominance block, a quantization matrix for the current block may be constructed only when the size of the current block is larger than 2×2.

EFFECT: increasing the efficiency of encoding/decoding images using a quantization matrix.

12 cl, 22 dwg, 1 tbl