ENCODER, DECODER, ENCODING METHOD, DECODING METHOD Russian patent published in 2025 - IPC H04N19/12 H04N19/159 H04N19/176 

FIELD: physics.

SUBSTANCE: invention relates to video encoding. Result is achieved by the fact that the encoding device outputs, by subtraction, from the image of the prediction of said image, which is generated by intra-prediction or inter-prediction, image prediction error (S311), performs primary transformation on the prediction error (S312), performs secondary transformation on the primary transformation result (S312), performs quantisation on the secondary transformation result (S313) and encodes the quantisation result as image data (S314). When performing secondary transformation, when matrix computation type intra prediction (MIP), in which a prediction image is generated by performing a matrix calculation on a pixel array obtained from pixel values of peripheral pixels of the target block, and which has a plurality of prediction modes, is used as intra-prediction, the encoding device uses a set of transformations common for the plurality of prediction modes, as a set of secondary transformation transformations, which is used for the primary transformation coefficient obtained as a result of the primary transformation (S312).

EFFECT: high coding efficiency.

5 cl, 70 dwg