ENCODER, DECODER AND CORRESPONDING METHODS THAT ARE USED FOR THE CONVERSION PROCESS Russian patent published in 2023 - IPC H04N19/122 H04N19/593 H04N19/625 

FIELD: image or video processing.

SUBSTANCE: invention relates to a conversion process. Methods are provided that comprise the following steps: when the prediction mode of the current coding block is intra prediction, and the current coding block is processed using the coding mode of the intra prediction subsection, determining whether the width of the current transform block is greater than or equal to a first threshold value, and whether or not it is less than or equal to the width of the current transform block to the second threshold value, the current transform block corresponds to the current coding block; when the width of the current transformation block is greater than or equal to the first threshold value, and the width of the current transformation block is less than or equal to the second threshold value, performing a transformation process for the current transformation block, where the transformation core DST 7 is used in horizontal direction transformation.

EFFECT: increased efficiency and speed of coding without any loss of image quality.

9 cl, 10 dwg, 5 tbl