Patents by Inventor Tangi POIRIER

Tangi POIRIER has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • SECONDARY TRANSFORM FOR VIDEO ENCODING AND DECODING
    Publication number: 20220345744
    Abstract: A method and apparatus for encoding/decoding a picture use a secondary transform for video encoding and decoding in INTRA mode and more particularly use a secondary transform for the transform units of a coding unit in intra sub partition mode. Different signaling and selection variants are proposed according to various parameters of the coding unit and transform unit.
    Type: Application
    Filed: July 27, 2020
    Publication date: October 27, 2022
    Inventors: Fabrice LeLeannec, Karam Naser, Tangi Poirier, Franck Galpin
  • METHOD AND APPARATUS FOR ENCODING AND DECODING A LARGE FIELD OF VIEW VIDEO
    Publication number: 20220345728
    Abstract: A method for coding/decoding a large field of view video into a bitstream in an immersive rendering system is disclosed. At least one picture of said large field of view video is represented as a surface, said surface being projected onto at least one 2D picture using a projection function. For at least one current block of said at least one 2D picture, at least one item of information representative of a modification of a 2D spatial neighborhood is determined according to said projection function. A group of neighboring blocks using said at least on item of information representative of a modification is determined and at least one part of encoding/decoding of said current block is performed using said determined group of neighboring blocks.
    Type: Application
    Filed: September 26, 2017
    Publication date: October 27, 2022
    Inventors: Tangi POIRIER, Franck GALPIN, Fabrice LELEANNEC
  • Method and apparatus for video encoding and decoding based on context switching
    Patent number: 11483562
    Abstract: Methods and apparatuses for video coding and decoding are provided. The method of video encoding includes accessing (1410) a bin of a syntax element associated with a block in a picture of a video, determining (1420) a context for the bin of the syntax element from a set of contexts associated with a block type of the block, the set of contexts including at least a first context and a second context, the second context being associated with a larger number of block types than the first context and entropy encoding (1430) the bin of the syntax element based on the determined context. A bitstream formatted to include encoded data, a computer-readable storage medium and a computer-readable program product are also described.
    Type: Grant
    Filed: December 12, 2018
    Date of Patent: October 25, 2022
    Assignee: InterDigital VC Holdings, Inc.
    Inventors: Fabrice Leleannec, Tangi Poirier, Ya Chen, Edouard Francois
  • Method and a device for picture encoding and decoding
    Patent number: 11483576
    Abstract: A method for encoding a picture block is disclosed. A predictor is determined as a weighted sum of sample values of a first motion compensated reference block in a first reference image and of a second motion compensated reference block in a second reference image. Then, a residual block determined from the picture block and the predictor is encoded in a bitstream. Advantageously, the weights of the weighted sum are determined by minimizing an error between reconstructed samples neighboring the picture block and samples neighboring the first and second reference blocks.
    Type: Grant
    Filed: March 19, 2019
    Date of Patent: October 25, 2022
    Assignee: InterDigital VC Holdings, Inc.
    Inventors: Tangi Poirier, Philippe Bordes, Fabrice Urban
  • Method and apparatus for video encoding and decoding with partially shared luma and chroma coding trees
    Patent number: 11483559
    Abstract: Different implementations are described, particularly implementations for video encoding and decoding based on wherein the partitioning tree structure is partially shared between luma and chroma blocks are presented. According to an implementation, a single partitioning tree structure is shared between luma and chroma blocks from a root node of the partitioning tree down to a switching node and a dual partitioning tree structure is determined for luma and chroma blocks from the switching node down to a leaf node of the partitioning tree. Thus, this implementation optimizes the coding efficiency by allowing separated trees for smaller blocks, while limiting the complexity of decoding pipeline.
    Type: Grant
    Filed: May 21, 2019
    Date of Patent: October 25, 2022
    Assignee: InterDigital VC Holdings, Inc.
    Inventors: Fabrice Leleannec, Franck Galpin, Tangi Poirier, Gagan Rath
  • SCALAR QUANTIZER DECISION SCHEME FOR DEPENDENT SCALAR QUANTIZATION
    Publication number: 20220329804
    Abstract: When dependent scalar quantization is used, the choice of the quantizer depends on the decoding of the preceding transform coefficient, and the entropy decoding of a transform coefficient depends on quantizer choice. To maintain high throughput in hardware implementations for transform coefficient entropy coding, several decision schemes of the scaler quantizer are proposed. In one implementation, the state transition and the context model selection are based on only regular coded bins. For example, the state transition can be based on the sum of the SIG, gt1 and gt2 flags, the exclusive-or function of the SIG, gt1 and gt2 flags, or based on only the gt1 or gt2 flag. When a block of transform coefficients is coded, the regular mode bins can be coded first in one or more scan passes, and the remaining bypass coded bins are grouped together in another one or more scan passes.
    Type: Application
    Filed: June 1, 2022
    Publication date: October 13, 2022
    Inventors: Ya Chen, Fabrice LELEANNEC, Tangi POIRIER, Philippe DE LAGRANGE
  • CODING TREE PARTITIONING
    Publication number: 20220321883
    Abstract: To encode a picture, a coding tree unit (CTU) in the picture is partitioned by a quadtree structure, and the quadtree leaf nodes can be further partitioned by a multi-type tree (MTT) structure. To increase the set of reachable coding tree nodes and leaves, we propose to increase the maximum allowed MTT hierarchy depth to be twice the difference between the CTU size and the minimum allowed size for a CU. The maximum allowed MTT hierarchy depth can be specified for all QT levels in order to provide more flexibility in the split tree. Alternatively, only two levels of maximum allowed MTT depth are signaled: one when QT splits are allowed, and another one when no more QT splits are allowed. In addition, an upper bound can be set for the minimum allowed coding block size, based on the coding tree unit size or the maximum allowed transform size.
    Type: Application
    Filed: September 18, 2020
    Publication date: October 6, 2022
    Inventors: Tangi POIRIER, Franck GALPIN, Fabrice URBAN, Fabrice LELEANNEC, Philippe DE LAGRANGE
  • METHOD FOR IMPROVED INTRA PREDICTION WHEN REFERENCE SAMPLES ARE MISSING
    Publication number: 20220312000
    Abstract: The method for intra frame prediction allows for the recovery of some intra directional modes that are otherwise rendered useless due to the classical padding process. Directional modes are recovered by filling pixel locations in the prediction unit with samples from the portion of the unit that is determined to have samples available for use using a counterpart directional mode to the one that is useless. When it is determined that reference samples are missing for a particular prediction unit or portion thereof given a particular directional mode, a determination is made about whether reference samples along another portion of the prediction unit are available. The other portion is the side of the prediction unit at an opposite end of the particular directional mode.
    Type: Application
    Filed: June 13, 2022
    Publication date: September 29, 2022
    Inventors: Fabien RACAPE, Franck GALPIN, Tangi POIRIER
  • TRANSFORM SELECTION FOR IMPLICIT MULTIPLE TRANSFORM SELECTION
    Publication number: 20220312040
    Abstract: A method and apparatus to improve compression efficiency in a video compression scheme enables use of new tools with multiple transform selection. In one embodiment, transform pair selection is based on a flag indicative of low-frequency non-separable transforms. In another embodiment, transform pair selection is based on a flag indicative of low-frequency non-separable transforms and on a flag indicative of matrix-based intra prediction. In another embodiment, when an implicit multiple transform selection mode is used, transform pair selection is based on a flag indicative of low-frequency non-separable transforms. Bitstream syntax is used to convey the flags.
    Type: Application
    Filed: May 28, 2020
    Publication date: September 29, 2022
    Inventors: Karam Naser, Fabrice LeLeannec, Tangi Poirier
  • Flexible implementations of multiple transforms
    Patent number: 11457211
    Abstract: In video coding, a transform can be selected from multiple transform sets. To efficiently implement multiple transforms, a unified architecture of implementing the Discrete Trigonometric Transforms (DTTs) or flipped DTT can be used. In the proposed unified architecture, the relationships between the transforms are utilized. In particular, all transforms can be implemented based on DCT-II, DCT-IV, a reverse order operation, and a sign changing operation for odd elements. The DCT-II can be implemented at a minimum size, and other sizes for DCT-II can be implemented recursively from the minimum size DCT-II and DCT-IV at various sizes. In one example, the multiple transforms are {DCT-II, DST-II, DCT-III, DST-III, DCT-IV, DST-IV}. The relationships between transforms can also be used to guide the design of additional transforms that can be implemented by the unified architecture.
    Type: Grant
    Filed: April 29, 2019
    Date of Patent: September 27, 2022
    Assignee: InterDigital VC Holdings, Inc.
    Inventors: Karam Naser, Tangi Poirier, Gagan Bihari Rath
  • LOSSLESS MODE FOR VERSATILE VIDEO CODING
    Publication number: 20220303535
    Abstract: A lossless coding mode is proposed in a video coding system comprising a plurality of coding tools, some being lossy by design, some of which can be adapted to become lossless or near lossless. To enable a lossless mode in such system, it is proposed to disable the tools that are lossy by design and use only lossless tools, to adapt some tools to enable lossless coding, and adapt some tools to enable near-lossless coding so that a secondary lossless coding may be applied after residual coding. In a specific embodiment, it is proposed to determine the type of residual coding by, when an information indicates that a transform skip residual coding is used, obtaining a flag representative of a special mode, and when this flag is true, determine that regular residual coding must be used instead of the transform skip residual coding that should be used.
    Type: Application
    Filed: June 16, 2020
    Publication date: September 22, 2022
    Inventors: Tangi Poirier, Fabrice Le Leannec, Karam Naser, Edouard Francois
  • SWITCHABLE INTERPOLATION FILTERS
    Publication number: 20220295057
    Abstract: A method and apparatus to improve compression efficiency in a video compression scheme enables use of switchable interpolation filters. The interpolation filters are used on multiple partitions of video blocks, enabling better motion compensated prediction and improved video coding efficiency. In one embodiment, an interpolation filter index is derived for triangle partitions of a block from motion information candidate parameters, so that each unidirectional motion compensation can use a different value of interpolation filter index. In another embodiment, an interpolation filter index is a function of characteristics, such as shape or area, of video partitions.
    Type: Application
    Filed: September 2, 2020
    Publication date: September 15, 2022
    Inventors: Philippe BORDES, Franck GALPIN, Tangi POIRIER, Philippe DE LAGRANGE
  • HMVC FOR AFFINE AND SBTMVP MOTION VECTOR PREDICTION MODES
    Publication number: 20220264147
    Abstract: An apparatus for encoding or decoding blocks of a current picture encodes sub-blocks of a first block of a current picture. The sub-blocks encoded or decoded based on motion vectors determined according a motion information data associated with the first block. In a second step, a set of second motion information data is determined as a function of the first motion information data. These second motion information data are added to a list of motion information data, that is used to determine a motion information data for further blocks of the current picture to encode or decode.
    Type: Application
    Filed: June 18, 2020
    Publication date: August 18, 2022
    Inventors: Antoine Robert, Fabrice Le Leannec, Tangi Poirier, Franck Galpin
  • Virtual temporal affine candidates
    Patent number: 11394960
    Abstract: A video encoder or decoder processes portions of video using virtual temporal affine motion candidates. Under the general aspects, virtual temporal affine candidates are created using only the classical temporal motion buffer information, avoiding the storage of additional affine parameters in a temporal motion buffer. A motion field for encoding or decoding a video block is generated based on the virtual temporal affine candidates. In one embodiment, collocated motion candidates are rescaled by adjusting the picture order count of the determined motion field. In another embodiment, resolution adaptation is performed to enable a current motion buffer to correspond to a reference motion buffer.
    Type: Grant
    Filed: June 14, 2019
    Date of Patent: July 19, 2022
    Assignee: INTERDIGITAL VC HOLDINGS, INC.
    Inventors: Antoine Robert, Franck Galpin, Tangi Poirier
  • QUANTIZATION MATRICES SELECTION FOR SEPARATE COLOR PLANE MODE
    Publication number: 20220224902
    Abstract: Methods and apparatus are provided for quantization matrix selection when using separate color plane mode so separate quantization matrices are assigned for each component of a video block. In one embodiment, even when in separate color plane mode, use of a color plane identification syntax element, such as colour_plane_id, is made for quantization matrix selection, instead of using the quantization matrices signaled for luma for all color components.
    Type: Application
    Filed: June 23, 2020
    Publication date: July 14, 2022
    Inventors: Philippe DE LAGRANGE, Fabrice URBAN, Tangi POIRIER, Michel KERDRANVAT
  • Scalar quantizer decision scheme for dependent scalar quantization
    Patent number: 11381822
    Abstract: When dependent scalar quantization is used, the choice of the quantizer depends on the decoding of the preceding transform coefficient, and the entropy decoding of a transform coefficient depends on quantizer choice. To maintain high throughput in hardware implementations for transform coefficient entropy coding, several decision schemes of the scaler quantizer are proposed. In one implementation, the state transition and the context model selection are based on only regular coded bins. For example, the state transition can be based on the sum of the SIG, gt1 and gt2 flags, the exclusive-or function of the SIG, gt1 and gt2 flags, or based on only the gt1 or gt2 flag. When a block of transform coefficients is coded, the regular mode bins can be coded first in one or more scan passes, and the remaining bypass coded bins are grouped together in another one or more scan passes.
    Type: Grant
    Filed: September 13, 2019
    Date of Patent: July 5, 2022
    Assignee: InterDigital VC Holdings, Inc.
    Inventors: Ya Chen, Fabrice Le Leannec, Tangi Poirier, Philippe De Lagrange
  • Translational and affine candidates in a unified list
    Patent number: 11375202
    Abstract: At least a method and an apparatus are presented for efficiently encoding or decoding video. For example, one or more prediction models are determined respectively for one or more prediction candidates used for the video encoding based on one or more control point motion vectors of a current block of the video being encoded or decoded. It is determined from the one or more control point motion vectors that a first prediction model of the one or more prediction models may be a translational prediction model. It is also determined from the one or more control point motion vectors that a second prediction model of the one or more prediction models is to be an affine prediction model. The video is encoded or decoded based on a candidate list comprising the one or more prediction candidates determined respectively from the one or more prediction models.
    Type: Grant
    Filed: September 4, 2019
    Date of Patent: June 28, 2022
    Assignee: InterDigital VC Holdings, Inc.
    Inventors: Franck Galpin, Tangi Poirier, Ya Chen
  • Multiple splits prioritizing for fast encoding
    Patent number: 11375189
    Abstract: A block of video data is split using at least one splitting rule and coded using existing transform sizes through one of several embodiments. In one embodiment, the block is split using a triple tree splitting operation if said at least two rectangular sub-blocks can be achieved with two successions of split operations with at least one triple tree split. In another embodiment, the video block is split using an asymmetric binary tree splitting if said at least two rectangular sub-blocks can be achieved with two successions of split operations with at least one asymmetric binary split. In another embodiment, a video block is split using successive splits, using both of the rules of the other embodiments.
    Type: Grant
    Filed: March 23, 2018
    Date of Patent: June 28, 2022
    Assignee: InterDigital VC Holdings, Inc.
    Inventors: Fabrice Leleannec, Fabien Racape, Tangi Poirier, Gagan Rath
  • Method for improved intra prediction when reference samples are missing
    Patent number: 11363254
    Abstract: The method for intra frame prediction allows for the recovery of some intra directional modes that are otherwise rendered useless due to the classical padding process. Directional modes are recovered by filling pixel locations in the prediction unit with samples from the portion of the unit that is determined to have samples available for use using a counterpart directional mode to the one that is useless. When it is determined that reference samples are missing for a particular prediction unit or portion thereof given a particular directional mode, a determination is made about whether reference samples along another portion of the prediction unit are available. The other portion is the side of the prediction unit at an opposite end of the particular directional mode.
    Type: Grant
    Filed: September 9, 2020
    Date of Patent: June 14, 2022
    Assignee: INTERDIGITAL VC HOLDINGS, INC.
    Inventors: Fabien Racape, Franck Galpin, Tangi Poirier
  • METHOD AND DEVICE FOR PICTURE ENCODING AND DECODING USING ILLUMINATION COMPENSATION
    Publication number: 20220159260
    Abstract: A method for reconstructing a picture block is disclosed, wherein the block is predicted using local illumination compensation. The parameters of local illumination compensation are determined according to a selection of reconstructed samples located to the left and above of the current block. In the case where some of them are unavailable, they may be replaced using different techniques.
    Type: Application
    Filed: February 3, 2020
    Publication date: May 19, 2022
    Inventors: Philippe BORDES, Fabrice LELEANNEC, Tangi POIRIER, Fabrice URBAN