IMAGE ENCODING METHOD BASED ON TRANSFORMATION AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2023 - IPC H04N19/122 

FIELD: image encoding.

SUBSTANCE: invention is related in particular to image encoding based on transformation. The result is achieved in that the decoding of the image contains the following steps: deriving the position of the last significant coefficient in the current block and the transformation coefficients for the current block based on the residual information; determining whether the index of the sub-block including the last significant coefficient is 0 and whether the position of the last significant coefficient in the sub-block is greater than 0; determining whether there is a significant coefficient in the second region except for the first region at the upper left end of the current block; and parsing the LFNST index from the bitstream when the position of the last significant coefficient is determined to be greater than 0 in the subblock in which the index is 0 and the significant coefficient does not exist in the second region.

EFFECT: increasing the encoding efficiency.

15 cl, 18 dwg, 13 tbl