IMAGE ENCODING DEVICE, IMAGE DECODING DEVICE, IMAGE ENCODING METHOD AND IMAGE DECODING METHOD Russian patent published in 2019 - IPC H04N19/117 H04N19/463 H04N19/86 

FIELD: data processing.

SUBSTANCE: invention relates to devices and methods for encoding and decoding images. Encoding device contains image compression means that quantizes the transformation coefficients of the difference image between the image and the prediction image and outputs, as compressed data, quantized transform coefficients, a filter that performs the filtering process on the decoded image, and an encoder, the filter determines the classification method relative to the coding block having the largest size, performs the classification for each pixel within the coding block, calculates the offset value for each class for the coding block, and performs an adaptive pixel offset process, the encoder encodes a quantization matrix parameter to form a quantization matrix and an index indicating said classification method, and encodes an offset value parameter based on a binarization process using a truncated unary code, and the maximum of the offset value is determined by the bit depth of the decoded image.

EFFECT: high efficiency of encoding and decoding images.

4 cl, 29 dwg