METHOD OF CONVERTING IN AN IMAGE ENCODING SYSTEM AND A DEVICE FOR REALIZING SAID METHOD Russian patent published in 2020 - IPC H04N19/13 

FIELD: computer equipment.

SUBSTANCE: invention relates to computer engineering. Conversion method in accordance with the present invention comprises the steps of: obtaining transform coefficients for the target block; determining an indivisible secondary transformation set (NSST) for a target block; selecting one of the plurality of NSST cores included in the NSST set based on the NSST index and generating the modified transform coefficients by the nonseparable secondary conversion of the transform coefficients based on the NSST core, which has been selected, wherein the NSST set for the target block is determined based on the intra-prediction mode and / or the size of the target block. In accordance with the present invention, the amount of transmitted data required for residual processing can be reduced, and the efficiency of residual coding can be improved.

EFFECT: technical result is higher efficiency of encoding images.

15 cl, 7 dwg, 6 tbl