Thomson Licensing S.a.

Thomson Licensing

Orange

Interdigital Madison Patent Holdings

Pierre Ruellou

Dominique Thoreau

Sylvain Kervadec

Edouard Francois

Philippe Bordes

Christophe Chevance

Philippe Salmon

Jean-Yves Aubie

Alain Sorin

Frédéric Plissonneau

A method is provided for processing an error during restitution of digital content during a multimedia session on a terminal. The session offers a plurality of representations of the digital content which are described in a medium carrying information describing the multimedia session and transmitted independently of the representation data. The method includes, following the obtaining of the description-carrying medium, acts of obtaining, for at least one representation indicated in the description information-carrying medium, at least one item of information regarding guarantee of availability of the data of the representation on a server; of comparing the information regarding guarantee of availability of the data of the representation on the server with at least one predetermined value; of selecting a fallback representation as a function of the result of the comparison, and upon detecting a restitution error, of toggling to the fallback representation selected.

Method of processing an error during the rendering of a digital content

The process for coding the current block comprises a step of selecting the predicted block from among candidate blocks, the selection being dependent on a difference Dbetween the co-located block of the current image block lying in an image of type B and the block of a reference image, the latter block being designated by the motion vector with components drx, dry which is allocated to co-located block and which is colinear with the motion vector Vp allocated to the current block and designating the candidate block. The process relates to data compression, the transmission of digital images using the video coding standard comprising a direct prediction mode, for example the h263, MPEG4 or h261 standard.

Motion estimation or P-type images using direct mode prediction

The method includes segmentation of the video image into image blocks, movement estimation per image block in order to obtain a field of movement vectors. It is characterized in that it includes a stage of reassignment of a vector to a block by selecting one movement vector from among N predominant vectors belonging to the field of vectors. The applications relate to movement estimation, for example, by image-block matching.

Method of motion estimation for transmission cost reduction of motion vectors

The process utilizing the inter mode with motion estimation with respect to a reference image and the intra mode, wherein: an exclusion zone which includes the macroblocks which lie even partially in the location of the imagette is defined in the image, the motion estimation of the macroblocks of the image not belonging to the exclusion zone cannot take account of an image block belonging to the exclusion zone in the reference image. Applications relate to the coding of images which is compatible with the inserting of logos or other imagettes specific to the utilizer. They also relate to the real-time coding of images comprising insets.

Process and device for coding images according to the MPEG standard for the insetting of imagettes

Picture compression process, especially of the MPEG2 type

The invention concerns a method comprising a step which consists in a quantizing step relative to a pixel or group of pixels in accordance with a desired rate. The invention is characterized in that it comprises an additional step which consists in modifying the quantizing step on the basis of an information of a subjective nature concerning said pixel or group of pixels. The invention is applicable to compression of video images.

Quantizing method and device for video compression

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Domloup, France

Pierre Ruellou