Method of coding and decoding images, coding and decoding device and computer programs corresponding thereto

A method for decoding a partition of a plurality of partitions corresponding to an image, the method comprising:

• receiving, from an encoder, the plurality of partitions and a plurality of context-based adaptive binary arithmetic coding (CABAC) encoded coefficients associated with the plurality of partitions;
• selecting a partition of the plurality of partitions;
• entropy decoding the partition, comprising entropy decoding of digital information corresponding to amplitudes of the encoded coefficients;
• obtaining a plurality of decoded coefficients representing a residual block for the partition, the plurality of decoded coefficients including at least one non-zero coefficient that is without a sign designation;
• estimating a number of hidden signs associated with the plurality of decoded coefficients;
• entropy decoding signs associated with the plurality of decoded coefficients based at least on estimating the number of hidden signs;
• generating a sign for the at least one non-zero coefficient without a sign designation by applying a function to the plurality of decoded coefficients, wherein applying the function to the plurality of decoded coefficients comprises:
• computing a sum of modifiable coefficients of the plurality of decoded coefficients,
• computing remainder data based on a division between the sum and a specific number, and
• designating the sign for the at least one non-zero coefficient based on the remainder data;
• dequantizing the plurality of decoded coefficients including the at least one non-zero coefficient with the designated sign to generate a dequantized block of coefficients;
• inverse transforming the dequantized block of coefficients to generate a decoded residual block for the selected partition;
• predictive decoding the selected partition with respect to at least one previously decoded partition to generate a predicted block for the selected partition;
• and
• constructing a decoded block for the selected partition by combining the decoded residual block and the predicted block.