Other

Thomson Licensing

France Telecom

Thomson Licensing S.a.

Thomson Multimedia S.a.

Nextream France

Ludovic Noblet

Patrice Alexandre

Xavier Ducloux

Philippe Guillotel

Olivier Le Meur

Claude Perron

Michel Jouan

Gilles Teniou

Christophe Daguet

Eric Mercier

Pierre Ruellou

A method is provided of coding a video sequence as a video stream having a base layer and one or more refinement layers destined for users having different user profiles. A visual object is coded in at least one of the refinement layers codes, which is distinct from visual objects coded in the base layer or in another of the refinement layers. The visual object corresponds to semantic content destined specifically for the users of one of the profiles.

Method of coding a scalable video stream destined for users with different profiles

The invention relates to a method for detecting a fade in a sequence of images which comprises the following steps:

Procedure and device for detecting fades in a sequence of images

The invention relates to a device for coding video frame sequences, comprising According to the invention, the means () for coding the frames as a frame structure or as a field structure are able to choose the field or frame structure dynamically as a function of the measurements of spatial and temporal activity of the said frame.

Device and method for coding video data

A device and a method for coding video images by motion compensation. The device incorporates a coding unit and a filtering unit. A calculation unit for calculating a recursivity coefficient as a function of an estimated noise level and a prediction error, a measurement unit for measuring the intra-image correlation and the inter-image correlation, a selection unit for selecting a type of coding applied to the current input image as a function at least of the measurements of the inter-image correlation and of the measurements of the intra-image correlation and as a function of the estimated noise level, a coding unit for coding the current input image as a function of the type of coding selected.

Device and process for coding video images by motion compensation

Variable bit-rate encoder

A block based signal compression system, as for example for coding video signal, and employing quantization of codewords or transform coefficients includes circuitry for adaptively controlling the quantization. Adaptivity of quantization is made a function of several parameters. One parameter is coding cost or bandwidth, wherein coding cost is generated on a macroblock basis but averaged over a window of macroblocks centered on a macroblock currently to be quantized. Another parameter is block or macroblock motion attributes, wherein block motion attribut values are used to modify the quantizing function.

Quantization process for video encoding

Growing community of inventors

Betton, France

Ludovic Noblet