PICTURE DECODING DEVICE, PICTURE DECODING METHOD AND A NON-TRANSITORY COMPUTER READABLE RECORDING MEDIUM Russian patent published in 2018 - IPC H04N19/91 H04N19/176 H04N19/593 

FIELD: data processing.

SUBSTANCE: invention relates to decoding images. An image decoding device that decodes the bitstream obtained by separating the difference information between the image being the decoding object, and the image being the prediction object to the plurality of subblocks and coding the divided subblock in a predetermined order, comprises: a decoding unit for information about a significant subblock indicating that all or not all values of the difference coefficients belonging to the subblock are equal to zero; a decoding unit for information about a significant difference coefficient indicative of equality or inequality of the value of the difference coefficient value; a decoding unit for the difference coefficient value; and a context extractor that extracts the context for decoding information about the significant difference coefficient of the subblock being the decoding object extracts the index and, based on this extracted index, extracts the context, and further extracts the context based on the position of the difference coefficient related to the subblock being the decoding object.

EFFECT: increase the efficiency of image decoding.

3 cl, 20 dwg