Thomson Licensing

Thomson Licensing Dtv

Interdigital Madison Patent Holdings

Jerome Vieron

Edouard Francois

Dominique Thoreau

Philippe Bordes

Aurelie Martin

Fabien Racape

Guillaume Boisson

Patrick Lopez

Gwenaelle Marquant

Philippe Robert

Olivier Le Meur

Christine Guillemot

Vincent Bottreau

Safa Cherigui

Jean-Jacques Fuchs

Chen Ying

Marie Babel

Philipe Bordes

Simon Lefort

Olivier Deforges

The method includes determining at least one candidate motion vector associated with a neighboring block of said current block. A prediction motion vector is determined from the candidate motion vector, and the current block is coded from the prediction motion vector. The prediction motion vector is determined according by determining, for the candidate motion vector, a corrective motion vector so as to minimize a distortion calculated between the neighoboring block successively coded and reconstructed and a prediction block motion compensated by the at least one candidate motion vector modified by the corrective motion vector. The prediction motion vector is then determined from the candidate motion vector modified by the corrective motion vector.

Motion vector prediction and refinement using candidate and correction motion vectors

A spatial prediction method of a block of pixels of an image, called current block, using a plurality of spatial prediction modes based on neighboring pixels of the current block is disclosed. The method comprises determining a prediction block of the current block according to each one of said spatial prediction modes and selecting one of said prediction blocks according to a predetermined criterion. According to the invention, before carrying out the preceding steps, it is detected, among said spatial prediction modes, whether some of them are redundant. If such redundant modes are detected, one of them is replaced by an additional mode, distinct from the other spatial prediction modes.

Spatial prediction method and device, coding and decoding methods and devices

A method for decoding a stream of coded data to reconstruct a current block of a sequence of images is disclosed. The method comprises the steps of: The step of determination of the second item of motion data is a function of the first distortion calculated between the first prediction block and the second prediction block.

Method for coding and method for decoding a block of an image and corresponding coding and decoding devices

A method for coding a current block using a parametric motion model whose parameters are defined from the motion data of the causal neighborhood is disclosed. Specifically, the method for coding the current block comprises the following steps: According to the invention, the parameters of the motion model are determined from the motion data associated with the causal neighborhood blocks of the current block. Therefore, they can be deducted from parts of images already coded and do not need to be incorporated in the image data stream.

Method for coding and decoding a block of pixels from a motion model

The invention proposes a method for reconstructing a self-similar textured region of an image. Said method comprises determining pixels of a part of the self-similar textured region by copying sample pixels from a sample part of the self-similar textured region, the sample pixels being selected using a neighborhood matching, wherein a size of neighborhoods used for matching is selected based on an analysis of descriptors computed from coefficients of OCT transform of differently sized blocks of the sample part. The analysis of descriptors computed from coefficients of DCT transform of differently sized blocks of the sample part allows for determining the neighborhood size close to a feature size of the texture.

Method and device for reconstructing a self-similar textured region of an image

A method for coding a block of pixels is disclosed. The method comprises the following steps: According to the invention, the current threshold value is determined or coded from neighboring reconstructed pixels of the current block.

Spatial prediction technique for video coding

A method for predicting a current block belonging to a current image with a view to the coding or the reconstruction of the current block. The method includes determining for the current block a reference block from at least one motion data previously associated with the current block. The fulfillment of a predefined condition is is verified. The predefined condition being representative of a temporal variation between the image data of the reference block and the image data of a prediction block of the reference block previously determined from at least one motion data associated with the reference block. The motion data is modified according to the result of the verification, and a final prediction block for the current block is generated from the motion data of the current block.

Method for predicting a block of image data by verifying condition relating temporal variation between image data of reference block and prediction block of previous reference block, decoding and coding devices implementing said method

The invention is made in the field of image block encoding and reconstruction. A method for reconstructing a current block of an image is described, the current block being encoded using predictive encoding of segments resulting from geometry adaptive block partitioning of said current block. After decoding encoded data comprising at least one flag and motion vectors, wherein blocks referenced by the motion vectors are used for prediction of segments of the current block, the at least one flag and an encoding order of the motion vectors in the encoded data is used for determining which of the referenced blocks exhibits a geometry that matches the geometry of the current block and for determining a segment of the determined block, wherein prior to determining the segment, the determined block is geometry adaptive block partitioned into segments from which the segment is determined for predicting one of the segments of the current block.

Method for reconstructing a current block of an image and corresponding encoding method, corresponding devices as well as storage medium carrying an images encoded in a bit stream

A method for coding a block of pixels is described. The coding method comprises: The determination of the prediction block comprises the following steps:

Method for coding and reconstructing a pixel block and corresponding devices

A method for decoding a stream of coded data representative of a sequence of images is disclosed. The decoding method comprises: A method for coding is further disclosed.

Method for decoding a stream of coded data representative of a sequence of images and method for coding a sequence of images

The process comprising splitting of an image into blocks, intra coding of a current block using spatial prediction based on a matching pursuit algorithm selecting, from a dictionary of atoms, the atom the most correlated with a causal neighborhood of the current block, is characterized in that it performs the following steps: &#x2014; determination of the two dimensional shift between the causal neighborhood and the selected atom, &#x2014; generation of at least, a new phased atom taking into account the values of the two dimensional spatial shift, &#x2014; use of this new atom for intra prediction, according to the matching pursuit algorithm, if better correlated than the selected one. Application to video data compression.

Process for coding and decoding video data of a sequence of images and corresponding encoder and decoder

A method for coding a current block is disclosed. The method comprises an iterative step of decomposition into atoms of a first dictionary of a vector of data comprising at least reconstructed image data associated with pixels situated in a causal neighboring area of a current block. At each iteration, the step of decomposition into atoms comprises the following steps for:

Method for coding and method for reconstruction of a block of an image sequence and corresponding devices

A method for coding a picture portion of a picure of a video sequence is disclosed, at least one picture of the video sequence being a key picture. The method comprises the following steps: The invention also relates to a method for decoding a binary stream, a coder able to code pictures of a video sequence and a decoder of a binary stream.

Method of coding, decoding, coder and decoder

A method for arithmetic coding of symbols in a stream is described. The method comprises the following steps:

Methods for arithmetic coding and decoding and corresponding devices

A method for decoding a stream of coded data representative of a sequence of images divided into blocks is described. It comprises the following steps for a current block: According to the invention, the decoding method comprises in addition a step of reorganization of residual data in the residual block before the reconstruction of the current block according to the content of the prediction block. The invention also relates to a method for coding.

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Paris, France

Jerome Vieron