France Telecom

Orange

Matthieu Moinard

Isabelle Amonou

Nathalie Cammas

Pierre Duhamel

Isabelle Corouge

Patrice Brault

A method and device are provided for encoding at least one image broken up into blocks. The method includes, for at least one current block, transforming the current block from the spatial domain into a transformed domain, outputting a transformed block including of a set of coefficients representative of the current block, referred to as original coefficients. The method further includes selecting a subset of original coefficients from the set and, for at least one original coefficient of the subset, the following steps: estimating the original coefficient, outputting an estimated coefficient in the transformed domain; determining a residual of a coefficient by comparing the original coefficient and the estimated coefficient; and encoding the residual of a coefficient.

Methods and devices for encoding and decoding at least one image implementing an estimation in the transform domain, and corresponding signal and computer program

A method for coding a sequence of video images comprising a cutting into zones of at least one current image of the sequence, characterized in that, for the coding of at least one target zone of said at least one current image, it comprises the steps of: determination (E) of a set of candidate zones in previously coded and then decoded parts of images of the sequence, minimizing a prediction error calculated over the neighborhood of the target zone, formation (E) of a set of groups of candidate zones in said set of candidate zones, as a function of a criterion of similarity between the candidate zones, identification (E) of a best group in said set of groups, minimizing a reconstruction error with respect to the target zone, determination (E) of an indication (n) representative of said identified best group; and coding (E) of said indication (n).

Encoding and decoding a video image sequence by image areas

A method is provided for encoding at least one image, divided into macroblocks, one macroblock including a set of blocks de pixels. The method includes, for at least one current macroblock of a current image, at least two iterations of the following steps: allocation of a priority level for encoding to at least one pixel of the current macroblock, selection of a pixel with the highest priority level called the priority pixel, prediction of a set of pixels including the priority pixel and a step of encoding a remainder from prediction for a region made up of predicted pixels of the macroblock, called the predicted region, the encoding step being used as and when the predicted region meets a predetermined encoding criterion.

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Solna, Sweden

Matthieu Moinard