Thales

Erwann Renan

Cédric Le Barz

Benjamin Gadat

Catherine Lamy-Bergot

François Capman

Marc Leny

Sébastien Marcille

Frédéric Dufaux

Marc Decombas

A method of determining the coding parameters of a variable-resolution video stream by a video coder, said video stream including multiple resolution layers and being compressed so as to be transmitted at a given rate or a given quality through a heterogeneous network to multiple users, said method including a classification step to associate each resolution level with a group of users and to determine the optimal coding parameters for each resolution level as a function of the requirements of each group of users.

Method and system for determining coding parameters on variable-resolution streams

A method and interactive system for the on-line transmission of a high-resolution video sequence composed of a succession of T images includes a step of selecting relevant images comprising at least the following steps: split each image to be transmitted at the instant t into a number N of zones, for each zone n determined in the previous step, calculate a value representative of the content of said zone, for each image to be transmitted, generate a vector representative of the content of said image containing the values obtained in the previous step, calculate a normalized coefficient of correlation &#x3b1; between the reference vector determined for a previously selected image and that calculated for the current image, make a decision on the selection (or not) of the current image as a function of the value of the normalized correlation coefficient &#x3b1;.

Interactive system and method for transmitting key images selected from a video stream over a low bandwidth network

A method is provided for visually encrypting at least one part of an at least partially compressed video stream or video sequence, it being possible for said stream to be decomposed into a first type of objects and a second type of objects, the method being applied on each of the images contained in a video sequence, including at least the following steps:

Method and system making it possible to protect after compression the confidentiality of the data of a video stream during its transmission

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Paris, France

Erwann Renan