CONTEXT INITIALIZATION IN ENTROPY CODING Russian patent published in 2021 - IPC H04N19/126 H04N19/13 H04N19/91 

FIELD: video data coding.

SUBSTANCE: invention relates to a principle of entropy coding for coding video data. A video decoder contains an entropy decoder capable of extracting the number of binarization bins from data stream using binary entropy decoding by selecting context from different contexts and updating probability states associated with different contexts. The module for conversion from a symbolic form is configured with the possibility to perform debinarization of syntax elements. The recovery module is capable to restore video based on integer values of syntax elements using a quantization parameter. The entropy decoder is capable to distinguish between 126 probability states and initialize probability states associated with different contexts according to a linear equation of the quantization parameter. The entropy decoder is capable to extract slope and offset of the linear equation from the first and second four-bit parts of the corresponding 8-bit initialization value for each of the different contexts.

EFFECT: increased coding efficiency.

26 cl, 12 tbl, 17 dwg