IMAGE ENCODING METHOD, IMAGE ENCODING DEVICE Russian patent published in 2025 - IPC H04N7/00 H04N19/10 

FIELD: data processing.

SUBSTANCE: invention relates to methods of encoding an image and methods of decoding an image. Encoding method includes: performing arithmetic encoding on a first flag (greater1_flag), which indicates whether an absolute value of a target coefficient in a target coefficient block is greater than 1 (S701); and performing arithmetic coding on a second flag (greater2_flag), which indicates whether the absolute value is greater than 2 (S702). In arithmetic coding over the first flag and arithmetic coding over the second flag, it is determined whether the immediately preceding block of coefficients, which has been encoded immediately before the target block of coefficients, a coefficient having an absolute value greater than a threshold value (S711). Based on the determination result, corresponding contexts are selected for use in arithmetic coding over the first and second flags (S712).

EFFECT: reducing the amount of processing while simultaneously suppressing the deterioration of coding efficiency.

17 cl, 64 dwg