Interdigital Vc Holdings, Inc.

Thomson Licensing

Interdigital Madison Patent Holdings, Sas

Interdigital Ce Patent Holdings

Interdigital Ce Patent Holdings, Sas

Sebastien Lasserre

Fabrice Leleannec

Yannick Olivier

Pierre Andrivon

David Touze

Philippe Bordes

Fabrice Le Leannec

Edouard Francois

Saurabh Puri

Franck Galpin

Kangying Cai

Celine Guede

Julien Ricard

Patrick Le Callet

Patrick Lopez

Tangi Poirier

Jean-Claude Chevet

Catherine Serre

Didier Doyen

Jurgen Stauder

Paul Kerbiriou

Klaus Gaedke

Mary-Luc Champel

Nicolas Le Scouarnec

Christophe Diot

Jean C Bolot

Joan Llach Pinsach

Martin May

Jens Peter Wittenburg

Wei Hu

Brian Charles Eriksson

Remi Jullian

Mark Crovella

Meinolf Bilawat

Piere Andrivon

Coding of the last coded coefficient position is performed by basing the coding of the y coordinate of the position of the last coded coefficient on knowledge of the size of the partial transform used to generate a block of coefficients from a block of video pixels. This enables a context adaptive coding of the last coded coefficient parameter to be performed much more efficiently.

Last coefficient coding for adaptive transform based video compression

A method and apparatus for improving the performance of video encoders and decoders involves selecting a set of transforms from among a plurality of sets of transforms that can be used for coding blocks in a region of a video image. Within a region, selection of a particular transform from among a plurality of transforms comprising the selected set of transforms is used to encoder or decode at least one block in the region. Associated indices representing the set of transforms to be used within a region and the selected transform for a block can be sent in a bitstream. In an alternate embodiment, a default set of transforms is complemented by selection of an additional set of transforms on a block or region basis.

Pools of transforms for local selection of a set of transforms in video coding

A method and device for generating points of a 3D scene from a depth image. To reach that aim, depth information associated with a current pixel is compared with depth information associated with pixels spatially adjacent to the current pixel in the depth image. When the difference of depth between the current pixel and an adjacent pixel is greater than a first value and less than a second value, at least an additional point of said 3D scene is generated, in addition to a current point associated with the current pixel of the depth image, the number of additional points depending on the depth difference.

Method and device for generating points of a 3D scene

This method for inter-predictive encoding of a time-varying 3D point cloud including a series of successive frames divided in 3D blocks into at least one bitstream comprises encoding (20) 3D motion information including a geometric transformation comprising rotation information representative of a rotation transformation and translation information representative of a translation transformation, wherein the translation information comprises a vector &#x394;T representing an estimation error of the translation transformation.

Method and device for predictive encoding/decoding of a point cloud

The present principles a method and a device for encoding the colors of a point cloud (IPC) representing a 3D object. The method is characterized in that the method comprises: &#x2014;obtaining () a set of points (SP) approximating the geometry of said point cloud (IPC); &#x2014;encoding () a color information data indicating that the color of at least one of the point of said set of points is encoded in a bitstream and that the colors of the other points of said set of points are not encoded in the bitstream. The present principles also relates to a method and a device for decoding the colors of a point cloud.

Method and apparatus for encoding/decoding the colors of a point cloud representing a 3D object

A decoding method is disclosed. The decoding method comprises: In a specific embodiment, determining the index comprises:

Method and a device for picture encoding and decoding

The present disclosure relates to the transmission of sets of data and metadata and more particularly to the transmission of light-field contents. Light-field data take up large amounts of storage space which makes storage cumbersome and processing less efficient. In addition, light-field acquisition devices are extremely heterogeneous and each camera has its own proprietary file format. Since acquired light-field data from different cameras have a diversity of formats a complex processing is induced on the receiver side. To this end, it is proposed a method for encoding a signal representative of a light-field content in which the parameters representing the rays of light sensed by the different pixels of the sensor are mapped on the sensor. A second set of encoded parameters are used to reconstruct the light-field content from the parameters representing the rays of light sensed by the different pixels of the sensor.

Method and a device for encoding a signal representative of a light-field content

The present disclosure generally relates to a device and a method of decoding a color picture from a bitstream. It comprises:

Method and device for decoding a color picture

This method comprises: &#x2014;accessing () a point cloud (PC) comprising a plurality of points defined by attributes, said attributes including a spatial position of a point in a 3D space and at least one feature of the point;&#x2014;segmenting () the point cloud into one or more clusters (C) of points on the basis of the attributes of the points; and for at least one cluster (C):&#x2014;constructing () a similarity graph having a plurality of vertices and at least one edge, the similarity graph representing a similarity among neighboring points of the cluster (C) in terms of the attributes, the plurality of vertices including vertices Pand Pcorresponding to points of the cluster (C);&#x2014;assigning one or more weights wto one or more edges connecting vertices Pand Pof the graph;&#x2014;computing () a transform using the one or more assigned weights, said transform being characterized by coefficients; and&#x2014;quantizing () and encoding () the transform coefficients.

Methods and devices for encoding and reconstructing a point cloud

Coding of the last coded coefficient position is performed by basing the coding of they coordinate of the position of the last coded coefficient on knowledge of the size of the partial transform used to generate a block of coefficients from a block of video pixels. This enables a context adaptive coding of the last coded coefficient parameter to be performed much more efficiently.

Significance flags in advanced video compression systems are coded using contexts adaptive to the last N significance flags coded taken in a scanning order. One embodiment uses the last N significance flags in scanning order as a predictor to determine which of a plurality of sets of significance flag contexts to use for coding subsequent significance flags. A second embodiment uses the last N significance flags in scanning order as a predictor in order to modulate the probability value associated with significance flag contexts that are used to code significance flags for future coding.

Method and apparatus for improved significance flag coding using simple local predictor

This method for up-sampling a point cloud representing a 3D object, comprises: &#x2014;detecting () points belonging to at least one under-sampled region of the point cloud on the basis of at least one desirable sampling rate (K); &#x2014;obtaining (), for each detected point, an associated tangent plane; &#x2014;inserting () in the point cloud at least one neighboring point of each detected point if a distance between the neighboring point and the tangent plane associated with the detected point is less than a first threshold.

Method and device for up-sampling a point cloud

Network equipment for establishing a manifest to be provided to a requesting terminal configured to receive a multimedia content divided into segments from a network equipment, each segment being available in one or more representations, said manifest listing available representations for the multimedia content and specifying a plurality of adaptation sets, each adaptation set defining a spatial object of the multimedia content, the spatial objects of the adaptation sets defining a whole spatial object is described. The network equipment includes at least one memory and at least one processing circuitry configured to define, in the manifest, a type of mapping of the multimedia content to the whole spatial object and a point of reference in one adaptation set of reference amongst the adaptation sets, and associate depth information with each adaptation set.

Method and network equipment for establishing a manifest

This method for encoding a 3D point cloud comprises: &#x2014;segmenting the point cloud into first patches (); &#x2014;determining inverse projection parameters of the patches (); &#x2014;projecting the first patches to planes using the inverse projection parameters (); &#x2014;encoding the planes (); &#x2014;determining sparse points in the point cloud not belonging to any patch (HC,); and&#x2014;encoding the sparse points using an octree-decomposition ().

The present principles relate to a method and device for context-adaptive binary arithmetic coding a sequence of binary symbols representing a syntax element related to video data or a syntax element relative to a video data. The method comprises, for each binary symbol of the sequence of binary symbols:&#x2014;obtaining () a context value from a context model defined for the binary symbol, said context value comprising bits representing the probability, called a first probability p, for the binary symbol to be equal to a binary value;&#x2014;determining () a second probability p' by modifying said first probability p according to at least one previously coded binary symbol of the sequence of binary symbols;&#x2014;arithmetic coding () the binary symbol based on said second probability p&#x2032;; and&#x2014;updating and storing () the first probability p of said context value

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Thorigné Fouillard, France

Sebastien Lasserre