METHOD FOR IMAGE CODING AND DECODING, CODING AND DECODING DEVICE AND CORRESPONDING COMPUTER PROGRAMS Russian patent published in 2023 - IPC H04N19/13 H04N19/105 H04N19/18 

FIELD: coding/decoding images.

SUBSTANCE: medium is proposed for decoding a section (Bi) of an image divided into sections, as well as a method comprising: receiving a set of coefficients encoded by a context-adaptive binary arithmetic coding (CABAC) type encoder; decoding a set of coefficients representing a block of residual data of the portion, wherein the first non-zero coefficient does not contain any sign value; applying the function to the set of coefficients to generate sign data, wherein applying the function to the set of coefficients comprises: calculating the sum of non-zero coefficients from said set of coefficients; calculation of the parity of the mentioned sum of coefficients. A sign is assigned to the first non-zero coefficient based on parity, wherein an even value of said sum of coefficients means that the sign of the first non-zero coefficient is positive, and an odd value of said sum of coefficients means that the sign of the first non-zero coefficient is negative.

EFFECT: increasing the accuracy of image coding/decoding.

3 cl, 4 dwg