Method for encoding and decoding images, encoding and decoding device, and corresponding computer programs

摘要

A method for encoding an image having been cut up into partitions. The method includes: predicting data of a current partition based on an already encoded and then decoded reference partition, generating a predicted partition; determining residual data by comparing data relating to the current partition with the predicted partition, the residual data associated with various digital data items. Prior producing a signal containing the encoded information, performing the following steps: determining, from the predetermined residual data, a subset containing residual data capable of being modified; calculating the value of a function representative of the residual data; comparing the calculated value with a value of at least one of the digital data items; based on the comparison, modification or non-modification of at least one of the residual data items of the subset; and, in the event of a modification, entropy encoding the at least one modified residual data item.

主权项

1. A method for decoding a sign-data-hiding enabled partition of an image, comprising:
receiving a set of context-based adaptive binary arithmetic coding (CABAC) encoded coefficients from an encoder; decoding the set of CABAC encoded coefficients to generate a set of coefficients representing a residual block for the sign-data-hiding enabled partition, the set of coefficients including a first non-zero coefficient that is without a sign designation; applying a function to the set of coefficients to generate sign data, wherein applying the function to the set of coefficients comprises:
computing a sum of non-zero coefficients in the set of coefficients; andcomputing remainder data based on a division between the sum and a specific number; and designating a sign for the first non-zero coefficient based on the sign data, wherein designating the sign for the first non-zero coefficient comprises:
designating the sign for each one of the non-zero coefficients that are without sign designations based on the remainder data and inverse transforming the residual block for the sign-data-hiding enabled partition.