IMAGE ENCODING METHOD BASED ON INDIVIDUAL SECONDARY CONVERSION AND DEVICE FOR IT Russian patent published in 2021 - IPC H04N19/40 H04N19/176 H04N19/18 H04N19/186 H04N19/119 H04N19/70 H04N19/167 

FIELD: images encoding.

SUBSTANCE: invention relates to a means for encoding images. Residual information for the target block is obtained from the bitstream. The transformation coefficients of the target block are obtained based on the residual information. Get the index of the inseparable transform for the target block. Residual samples of the target block are obtained based on the inverse transform for the transform coefficients of the target block, the inverse transform being based on the index of the inseparable transform. A reconstructed frame is generated based on the residual samples. In this case, based on the case where a non-zero transform coefficient is included in the transform coefficients from the (R+1)-th to the Nth among the transform coefficients of the target block, 0 is obtained as the value of the indivisible transform index the non-separable transform index value is not 0, the inverse transform based on the inseparable transform for the transform coefficients in the upper left target area of ​​the target block is performed based on the transform matrix associated with the inseparable transform index.

EFFECT: improving the efficiency of image coding.

15 cl, 18 dwg, 5 tbl