IMAGE ENCODING DEVICE, IMAGE DECODING DEVICE, IMAGE ENCODING METHOD AND IMAGE DECODING METHOD Russian patent published in 2020 - IPC H04N19/117 H04N19/463 H04N19/86 

FIELD: data processing.

SUBSTANCE: invention relates to encoding and decoding devices. Device comprises: an image compression means, which performs a conversion process over a differential image between the input image and the prediction image, quantises the differential image conversion coefficients, outputs quantised transformation coefficients as compressed data; filter which determines a classification method of a class relative to each coding unit having the largest size, performs classification with respect to each pixel within each coding unit having the largest size, by using said classification method, calculates an offset value for each class for each encoding unit having the largest size, performs an adaptive pixel shift operation; variable-length coder which encodes a parameter with variable word length associated with a quantisation matrix to form a quantisation matrix and an index, maximum displacement value is determined by bit depth of the decoded image.

EFFECT: technical result is higher efficiency of encoding and decoding images.

2 cl, 28 dwg