IMAGE ENCODING METHOD BASED ON TRANSFORMATION AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2023 - IPC H04N19/18 H04N19/176 H04N19/186 H04N19/132 H04N19/124 H04N19/96 

FIELD: image encoding and decoding.

SUBSTANCE: discrete prediction samples for the current block are outputted. The residual samples for the current block are derived based on the prediction samples. The transformation coefficients for the current block are derived based on the primary transformation of the residual discrete samples. The modified transform coefficients are derived from the transform coefficients by applying LFNST. The transform coefficients or modified transform coefficients are quantized based on a predetermined scaling list. Whether or not to apply the scaling list is determined based on whether LFNST is applied and the tree type of the current block. The tree type of the current block is one of three tree types, including a single tree, a dual brightness tree, a dual chroma tree. The scaling list is applied to the current block when the tree type of the current block is a single tree and the current block is a chroma component. The scaling list is not applied to the current block when the current block's tree type is dual chroma tree.

EFFECT: increased efficiency of image encoding.

13 cl, 13 tbl, 16 dwg