Canon Kabushiki Kaisha

France Telecom

Orange

Isabelle Corouge

Félix Henry

Christophe Gisquet

Isabelle Amonou

Matthieu Moinard

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

The present invention relates to a method and a device for coding a multidimensional signal (LL) comprising samples to form a coded stream (FC), such as an image or a multimedia content. The method comprises: &#x2014;filtering (E) original samples by applying a first filter (F, G) to obtain filtered samples (L) &#x2014;coding (E) said filtered samples to obtain coded filtered samples adapted to be decoded by a decoder into decoded filtered samples, &#x2014;applying (E) a lossy modification on the filtered samples to obtain modified samples (L); &#x2014;determining (E, E, E) a geometric orientation of one second filter (F', G&#x2032;) to be applied by the decoder to a decoded filtered sample, the determining being based on the modified samples, the original samples and a predetermined criterion, and &#x2014;providing (E) said determined geometric orientations and said coded filtered samples to the decoder.

Method and device for coding a multi dimensional digital signal comprising original samples to form coded stream

To filter a digital signal, in which, for each sample of the signal, a plurality of context functions take account of a predetermined number of other samples of the signal: the value of a context function from the plurality of context functions for each sample to be filtered is calculated; the signal is divided into a set of sub-signals corresponding respectively to the different values of the context functions; and, for each sub-signal: an optimal filter is determined according to a first criterion that depends on the values of the sub-signal; and the optimal filter is associated with the context function corresponding to the sub-signal. Application to the coding of a digital signal representing an image.

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Rennes, France

Isabelle Corouge