Thomson Licensing

Canon Kabushiki Kaisha

Thomson Licensing Dtv

Edouard François

Christophe Gisquet

Dominique Thoreau

Patrice Onno

Guillaume Laroche

Jérôme Vieron

Philippe Bordes

Ying Li

Laurent Blonde

Philippe Guillotel

Patrick Lopez

Jean Kypreos

Vincent Bottreau

Lila Huguenel

Aurélie Martin

Thierry Kerber

Gwenael Kervella

The invention relates to video coding. A method of encoding or decoding such a video sequence according to the invention comprises: obtaining a reconstructed frame area made of an array of sample values; applying a sample adaptive offset, SAO, filtering to the reconstructed frame area based on SAO parameters; wherein at least one of the SAO parameters is determined independently of the sample values of the reconstructed frame area. Preferably, the sample-independent SAO parameters define an Edge Offset filtering.

Method, device, computer program, and information storage means for encoding or decoding a video sequence

A method and a device for classifying samples of an image, each sample having a respective sample value the method comprising repartition of each of the samples into a plurality of index classes, wherein the index class allocated to each sample is determined in dependence upon the sample value of the said sample with respect to the sample values of first neighboring samples of said sample according to a given direction and further in respect to the sample values of the first neighboring samples with respect to the sample values of samples neighboring the first neighboring samples according to the said given direction. Processing each sample according to the respective allocated index class.

Method and device for classifying samples of an image

A method for processing components of an image for coding a sample of the image, the image being composed of a first type of component and a second type of component, wherein samples of the second type of component are predictable from samples of the first type of component using a prediction model, computing one parameter value for use in representing, in the prediction model, the link between the first type of component and the second type of component; detecting, whether or not, one type of error exists in one such computed parameter value of the prediction model and in the case where a first type of error is detected; adapting the computed parameter value to correct for the error detected; and predicting a sample of the second type from a sample of the first type using the prediction model and the adapted parameter value.

Method and apparatus for processing components of an image

A high dynamic picture transmission system is provided. The transmission system includes a coding unit configured to generate a standard bitstream and at least a second bitstream. The standard bitstream coding the pictures such that the luminance of each pixel is coded with a standard dynamic, and the second bitstream contains the information necessary to reconstruct the luminance of high dynamic pictures from the coded luminance with the standard dynamic contained in the standard bitstream.

High-dynamics image transmission system, encoding and decoding units and methods therefor

The method comprises a coding of a source block according to a coding mode wherein the selection of the coding mode is carried out, for a source block, according to coding error estimations and source block coding cost estimations for the different coding modes tested, the coding error being estimated, for a coding mode, according to the sum of the absolute values of coefficients obtained after a mathematical transformation in the frequency domain of the residue block related to this coding mode and as a function of the sum of absolute values of quantized coefficients corresponding to this coding mode. An application is the decision of the coding mode for data using the MPEG 2 or MPEG4-AVC standard.

Method and device for coding a video image with a coding error estimation algorithm

The invention relates to a method for generating for at least one macroblock of a high resolution image at least one motion predictor from motion data associated to macroblock(s) of a low resolution image. The method comprises the following steps: &#x2014;defining a virtual structure made up of non overlapping macroblocks, called virtual base layer macroblocks; &#x2014;identifying for the high resolution macroblock corresponding virtual base layer macroblocks in the virtual image on the basis of the location of the high resolution macroblock within the high resolution image and on the basis of the ratios of low resolution and high resolution images dimensions; &#x2014;deriving, for each identified virtual base layer macroblocks, motion data from motion data associated to at least one macroblock of a corresponding low resolution macroblocks pair on the basis of the field/frame mode of the corresponding low resolution macroblocks pair and on the basis of the field/frame mode of the high resolution macroblock; &#x2014;resampling motion data associated to the corresponding virtual base layer macroblocks so as to generate the at least one motion predictor.

Inter-layer motion prediction method using resampling

A process for converting the format of an image sequence wherein, for a coded pixel group to be converted, if the mode of coding used is of the inter type with no residue, the conversion is performed by a copy of a converted pixel group of a preceding image linked by the motion vector associated with said coded pixel group.

Process for the format conversion of an image sequence

Device and method for inserting error correcting codes and for reconstructing data streams, and corresponding products The present invention relates to a device () for inserting error correcting codes into data streams () intended to be sent in packets in a network (), a device () for reconstructing data streams (), and corresponding methods and products. The insertion device comprises a unit () for identifying resynchronization indicators dispersed in the data streams and a unit () for determining successive segments in these streams, the segments forming partitions of the data lying between two consecutive resynchronization indicators. It also comprises a unit () for allocating a set of error correcting codes to each of these segments, these sets of codes having decreasing sizes between any two of the consecutive resynchronization indicators. Preferably, the device also comprises a data interleaving unit ().

Device and method for inserting error correcting codes and for reconstructing data streams, and corresponding products

The device is characterized in that it comprises means for preventing the 'skipped macroblock' mode of coding of a macroblock of an image of P type on the basis of a correlation item measuring the correlation of this macroblock or of the co-located macroblock of the previous I or P image with the co-located macroblock of a next image of B type, in the order of coding.

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Bourg des Comptes, France

Edouard François