ENCODER, DECODER AND CORRESPONDING METHODS HARMONIZING MATRIX-BASED INTRA PREDICTION AND SECONDARY TRANSFORMATION KERNEL SELECTION Russian patent published in 2024 - IPC H04N19/12 H04N19/593 H04N19/176 H04N19/61 

FIELD: physics.

SUBSTANCE: invention relates to video encoding means. Internal prediction mode of the current block is determined. Secondary transformation of the current block is selected based on the intra prediction mode determined for the current block. When the internal prediction mode is less than 0, the set of cores of inseparable secondary transformation is set equal to 1. When the internal prediction mode is equal to 0 or 1, the set of cores of inseparable secondary transformation is set equal to 0. When the internal prediction mode is greater than or equal to 2 and less than or equal to 12, the set of cores of the inseparable secondary transformation is set equal to 1. When the internal prediction mode is greater than or equal to 13 and less than or equal to 23, the set of cores of the inseparable secondary transformation is set equal to 2. When the internal prediction mode is greater than or equal to 24 and less than or equal to 44, the set of cores of the inseparable secondary transformation is set equal to 3. When the internal prediction mode is greater than or equal to 45 and less than or equal to 55, the set of cores of the inseparable secondary transformation is set equal to 2.

EFFECT: high efficiency of video encoding.

31 cl, 20 dwg, 8 tbl