Interdigital Vc Holdings, Inc.

Thomson Licensing

Canon Kabushiki Kaisha

Interdigital Madison Patent Holdings, Sas

Interdigital Ce Patent Holdings, Sas

Thomson Licensing Dtv

Thomson Licensing S.a.

Interdigital Madison Patent Holdings

Interdigital Vc Holdings France, Sas

Interdigital Ce Patent Holdings

Edouard Francois

Guillaume Laroche

Dominique Thoreau

Patrice Onno

Philippe Bordes

Pierre Andrivon

Christophe Gisquet

Franck Galpin

Jerome Vieron

Fabrice Leleannec

Philippe De Lagrange

Christophe Chevance

Franck Hiron

Tangi Poirier

Fabien Racape

Yannick Olivier

Guillaume Boisson

Sebastien Lasserre

David Touze

Ya Chen

Patrick Lopez

Karam Naser

Fabrice LeLeannec

Fabrice Le Leannec

Philippe Robert

Philippe Guillotel

Olivier Le Meur

Christine Guillemot

Ying Hai Chen

Ying Li

Erik Reinhard

Michel Kerdranvat

Fabrice Urban

Gagan Bihari Rath

Christel Chamaret

Laurent Blonde

Jurgen Stauder

Kangying Cai

Paul Kerbiriou

Patrick Morvan

Jürgen Stauder

Gwenaelle Marquant

Patrick Perez

Patrick Le Callet

Philippe Salmon

Jérôme Vieron

Aurelie Martin

Vincent Bottreau

Anne Lorette

Safa Cherigui

Remi Jullian

Zoubida Ameur

Milos Radosavljevic

Aurélie Martin

Chen Ying

Kai Xie

Dominique Barba

Nicolas Burdin

Anita Orhand

Jean Kypreos

Claire-Helene Demarty

Pierre Ruellou

Gagan Rath

Srinivas Gudumasu

Gaëlle Martin-Cocher

Joaquin Zepeda Salvatierra

Francois Cellier

Lila Huguenel

Gwenaëlle Marquant

Sébastien Lasserre

Jean-Jacques Fuchs

Jérome Vieron

Gwenael Kervella

Hadrien Gurnel

Jéróme Vieron

Shasha Shi

Philipe Bordes

Ying Chen

Methods and apparatus for performing intra prediction in an encoder or a decoder for non-square blocks enable a combination of reference samples from a row above the non-square block and a row to the left of the non-square block to be used for the prediction. In one embodiment, a weighted combination of reference samples are used. In another embodiment, the angles of prediction are extended in the longer direction of the non-square block, such that less angles of prediction are used in the shorter direction.

Wide angle intra prediction and position dependent intra prediction combination

Methods and apparatuses for video coding and decoding are provided. The method of video encoding includes accessing a reconstructed block corresponding to a block in a picture of a video, determining at least one filter pattern based on a property of the block and filtering the reconstructed block according to the at least one filter pattern. The method of video decoding includes accessing a reconstructed block corresponding to a block in a picture of an encoded video, determining at least one filter pattern based on a property of the block and filtering the reconstructed block according to the at least one filter pattern. A bitstream formatted to include encoded data, a computer-readable storage medium and a computer program product are also described.

Method and apparatus for video encoding and decoding using pattern-based block filtering

A method and device for reducing power consumption of display devices proposes to reduce the total amount of light emitted in a perceptually indistinguishable manner based on the on the human visual sensitivity at the position of a pixel. The visibility of the processing can be made to remain provably below threshold, whereas other techniques may not be able to provide such proof. This is achieved by determining a minimum detectable modulation or a corresponding just-noticeable difference based on frequency intensity information for a pixel representative of how much there is of a set of frequencies at the pixel and a contrast sensitivity function representative of a model of human vision that predicts which contrasts at which frequencies are visible to the human eye. Pixel values may be reduced based on this minimum detectable modulation or just-noticeable difference. The contrast sensitivity function may be given by Barten's model and the frequency intensity information may be based on a hierarchical map built using a discrete wavelet transform or a continuous wavelet transform.

Pixel modification to reduce energy consumption of a display device

A method for encoding a block of a picture comprising, for at least one sample of the block and for one current component: obtaining a prediction value; determining a mapped residual value from a source value of the sample and from the prediction value responsive to a mapping function; and encoding the mapped residual value into a bitstream; wherein the mapping function is derived to obtain at least one of a reduction of a bit cost of the bitstream for a given quality of reconstruction or an increase of quality of reconstruction for a given bit cost of the bitstream.

Method and device for predictive picture encoding and decoding

A video coding system uses a value of a chroma quantization parameter table to quantize or de-quantize chroma values of a block of the video, the chroma quantization parameter table being directly coded in a set of parameters at the picture level or at the sequence level of the coded video stream. A corresponding encoding method, encoding device, decoding method, decoding device, and non-transitory readable medium are proposed.

Chroma quantization parameter adjustment in video encoding and decoding

At least a method and an apparatus are presented for efficiently processing film grain while encoding or decoding video. For example, the method comprises estimating film grain parameters for a plurality of image blocks in an image with film grain, wherein the film grain parameters comprise at least one scaling factor. The estimating further comprises obtaining a plurality of film grain blocks, a film grain block being representative of a film grain estimate in an image block; obtaining a plurality of filtered blocks, a filtered block being representative of an image block without film grain; and determining at least one scaling factor for the plurality of images blocks in the image wherein the at least one scaling factor is adapted to statistics based on the plurality of film grain blocks and on the plurality of filtered blocks.

Method or an apparatus for estimating film grain parameters

Apparatuses and methods for encoding or decoding picture information that involve determining a scaling factor to scale a chroma prediction residual associated with chroma information included in the picture information; scaling the chroma prediction residual based on the scaling factor to provide a scaled chroma prediction residual; and encoding or decoding at least a portion of the picture information based on the scaled chroma prediction residual.

Chroma processing for video encoding and decoding

At least a method and an apparatus are provided for efficiently encoding or decoding video. For example, a plurality of different motion prediction modes for a current block are obtained. The current block is encoded or decoded based on a combination of the plurality of different motion prediction modes with corresponding weights for a plurality of sub-blocks of the current block, wherein the combination with the corresponding weights comprising an inter prediction mode and an intra prediction mode.

Triangle and multi-hypothesis combination for video coding and decoding

Different implementations are described, particularly implementations for video encoding and decoding are presented. According to an implementation, in a method for encoding or decoding a part of an image, at least an equation of the bi-directional optical flow is modified for unequal weights in a weighted prediction of the part of the image. According to non-limiting examples, modifying the bi-directional optical flow equation comprises bit depth shifting the unequal weights used in the weighted prediction, quantifying the unequal weighs used in the weighted prediction or deriving modified weighs to apply to predictions of the part of the image from the unequal weights used in weighted prediction.

Method and apparatus for video encoding and decoding with bi-directional optical flow adapted to weighted prediction

An encoding method is disclosed. At least one context is first determined for encoding a syntax element associated with a block of a picture responsive to a current quantization parameter associated with the block. Second, the syntax element is context-based entropy encoded with the at least one determined context.

Context-based binary arithmetic encoding and decoding

Video coding tools can be controlled by including syntax in a video bitstream that makes better use of video decoding resources. An encoder inserts syntax into a video bitstream to enable a decoder to parse the bitstream and easily control which tools combinations are enabled, which combinations are not permitted, and which tools are activated for various components in a multiple component bitstream, leading to potential parallelization of bitstream decoding.

Managing coding tools combinations and restrictions

A method comprising: obtaining () a syntax element associated with video data, wherein said syntax element specifies that a cross-color component transform process in which at least one second color component is transformed based on at least one first color component different from the second color component is to be applied to the video data as a post processing process following a decoding process to be applied to the video data.

Method and device for luma mapping with cross component scaling

An image is split into a plurality of blocks of various sizes and a subdivision level counter is associated to each of the blocks. The value of this subdivision level counter for a block is representative of the size of the block and is used to determine the quantization parameter for the block. The value is propagated for each subdivision and incremented according the type of the subdivision. When the image is split, an analysis is done according to the subdivision level counter, a maximal value of subdivision and the type of split, in order to determine the start of a new quantization group and when it is the case, the current position of the partition is propagated to the further split partitions to be stored with these partition and serve in the prediction process when decoding.

Quantization for video encoding or decoding based on the surface of a block

Flexible methods to use a combination of coding modes while keeping good performance tradeoff are implemented with embodiments that determine coding mode information. In one embodiment, determination is made of activation of a first coding mode, and upon determination of whether a second coding mode is used, coding or decoding using the determined modes occurs. Other embodiments enable use of multiple reference lines, intra sub-block partitioning, matrix intra prediction, and low frequency non-separable transforms.

Method and apparatus using homogeneous syntax with coding tools

A cross-component dependent tool to be used for a chroma block of a picture is enabled responsive to a size of said chroma block and to a size of at least one luma block co-located with the chroma block. Then, the chroma block is decoded responsive to said enablement of said cross-component dependent tool. A encoding and decoding methods are presented as well as encoding and decoding devices.

Method and device for picture encoding and decoding

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Bourg des Comptes, France

Edouard Francois