公开(公告)号：US11240505B2

公开(公告)日：2022-02-01

申请号：US16762184

申请日：2018-11-07

Applicant: INTERDIGITAL VC HOLDINGS, INC.

Inventor： Tangi Poirier ,  Fabrice Leleannec ,  Fabrice Urban

IPC: H04N19/129 ,  H04N19/119 ,  H04N19/176 ,  H04N19/593 ,  H04N19/124

Abstract: Different implementations arc described, particularly implementations for selecting a scan order of the sub-blocks of a current block being encoded or decoded when the current block is composed of multiple sub-blocks. In one example, a corresponding dependency number indicative of a number of the other of the plurality of sub-blocks that each of the sub-blocks uses for spatial prediction is determined, based on the corresponding intra prediction mode for the each of the plurality of sub-blocks. A scan order of the plurality of sub-blocks is determined based on the determined corresponding dependency number for the each of the plurality of the sub-blocks. The current block is encoded or decoded using the determined scan order of the plurality of sub-blocks.

公开(公告)号：US20220030268A1

公开(公告)日：2022-01-27

申请号：US17277199

申请日：2019-09-20

Applicant: InterDigital VC Holdings, Inc.

Inventor： Fabrice Le Leannec ,  Franck Galpin ,  Tangi Poirier ,  Philippe Bordes

IPC: H04N19/55 ,  H04N19/176

Abstract: In general, encoding or decoding a picture part can involve determining a spatiotemporal motion vector predictor (STMVP) candidate for a merge mode of operation from spatial motion vector candidates taken from spatial positions around a current coding unit (CU) and a temporal motion vector candidate, where at least one embodiment involves determining the STMVP candidate based on considering at most two spatial positions and based on an average of at least two of the spatial and temporal motion vector candidates.

公开(公告)号：US11223830B2

公开(公告)日：2022-01-11

申请号：US16760890

申请日：2019-01-22

Applicant: InterDigital VC Holdings, Inc.

Inventor： Tangi Poirier ,  Fabrice Leleannec ,  Franck Galpin ,  Ya Chen

IPC: H04N19/137 ,  H04N19/105 ,  H04N19/176 ,  H04N19/46

Abstract: Different implementations are described for determining one or more illumination compensation parameters for a current block being encoded by a video encoder or decoded by a video decoder. A plurality of motion vectors for a current block being encoded in a picture are determined. One or more illumination compensation parameters for each of the plurality of motion vectors are determined and encoded or decoded. The current block is then encoded or decoded using the plurality of motion vectors and the one or more illumination compensation parameters for each of the plurality of motion vectors. In one embodiment, a flag is used to signal the use or not of the illumination compensation. In another embodiment, the illumination compensation flag is not encoded or decoded if illumination compensation is not used.

公开(公告)号：US11197006B2

公开(公告)日：2021-12-07

申请号：US17047908

申请日：2019-06-21

Applicant: InterDigital VC Holdings, Inc.

Inventor： Tangi Poirier ,  Fabrice Le Leannec ,  Franck Galpin

IPC: H04N19/186 ,  H04N19/176 ,  H04N19/70 ,  H04N19/96 ,  H04N19/167 ,  H04N19/436 ,  H04N19/13

Abstract: At least a method and an apparatus are presented for improving parallelization for wavefront parallel encoding and decoding of luma and chroma components of a vide picture. For example, a luma component and a chroma component of a video picture are independently subdivided into respectively a plurality of luma coding units and a plurality of chroma coding units. A context-based adaptive binary coding context variable is propagated from a previous row to a current row of the independently subdivided plurality of luma coding units, and a context-based adaptive binary coding context variable is propagated from a previous row to a current row of the independently subdivided plurality of chroma coding units. The video picture is encoded or decoded using the propagations to provide the wavefront parallel processing.

公开(公告)号：US20210168384A1

公开(公告)日：2021-06-03

申请号：US17047248

申请日：2019-03-19

Applicant: InterDigital VC Holdings, Inc.

Inventor： Tangi Poirier ,  Philippe BORDES ,  fabrice URBAN

IPC: H04N19/184 ,  H04N19/176

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.

公开(公告)号：US10986366B2

公开(公告)日：2021-04-20

申请号：US16312213

申请日：2017-06-27

Applicant: InterDigital VC Holdings, Inc.

Inventor： Philippe Bordes ,  Fabien Racape ,  Tangi Poirier ,  Franck Galpin

IPC: H04N19/53 ,  H04N19/139 ,  H04N19/176 ,  H04N19/31 ,  H04N19/52 ,  H04N19/513 ,  H04N19/44 ,  H04N19/14 ,  H04N19/46

Abstract: In a particular implementation, a video decoder may decode an initial motion vector predictor from the bitstream for a current block, and perform motion search in a small search window to refine the initial motion vector predictor. The initial motion vector may be rounded before being refined. The motion refinement can be based on a discontinuity measure between pixels of a current block and pixels of adjacent block, and can also be based on gradients between the current block and adjacent blocks. The motion vector for the current block is then decoded based on the refined motion vector predictor, and the motion vector difference if there is any. The motion refinement can also be performed on the motion vector for the current block directly. Through motion refinement, the decoder may increase the motion resolution. A corresponding video encoder may choose whether to use motion refinement based on encoder decisions.

公开(公告)号：US10834387B2

公开(公告)日：2020-11-10

申请号：US16336228

申请日：2017-09-18

Applicant: INTERDIGITAL VC HOLDINGS, INC.

Inventor： Fabien Racape ,  Franck Galpin ,  Tangi Poirier

IPC: H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/11 ,  H04N19/176 ,  H04N19/593 ,  H04N19/182

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. When it is determined that such reference samples are available, it is possible to extend the number of intra directional modes by replacing the particular directional modes that are rendered useless, because of the unavailability of reference samples, with their counterpart directional modes that are oppositely directed.

公开(公告)号：US12267529B2

公开(公告)日：2025-04-01

申请号：US17615499

申请日：2020-05-28

Applicant: InterDigital VC Holdings, Inc.

Inventor： Karam Naser ,  Fabrice LeLeannec ,  Tangi Poirier

IPC: H04N19/70 ,  H04N19/103 ,  H04N19/176 ,  H04N19/46

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.

公开(公告)号：US12126803B2

公开(公告)日：2024-10-22

申请号：US18377902

申请日：2023-10-09

Applicant: INTERDIGITAL VC HOLDINGS, INC.

Inventor： Fabrice Leleannec ,  Tangi Poirier ,  Gagan Rath ,  Fabrice Urban

IPC: H04N19/122 ,  G06T9/40 ,  H04N19/119 ,  H04N19/176 ,  H04N19/70

CPC classification number: H04N19/122 ,  G06T9/40 ,  H04N19/119 ,  H04N19/176 ,  H04N19/70

Abstract: An improvement in coding efficiency is achieved through restrictions on successive divisions of asymmetric splitting in advanced video coding algorithms, which frequently rely on splitting of a block of video data prior to coding using several transform sizes. Successive divisions of asymmetric splitting are forbidden if an equivalent split can be attained using triple splitting. In an embodiment, a video block is split using successive splits, but the second type of split is dependent on the first type of split.

公开(公告)号：US12063376B2

公开(公告)日：2024-08-13

申请号：US18197695

申请日：2023-05-15

Applicant: InterDigital VC Holdings, Inc.

Inventor： Fabrice Le Léannec ,  Tangi Poirier ,  Ya Chen ,  Philippe Bordes

IPC: H04N19/00 ,  H04N19/136 ,  H04N19/176 ,  H04N19/186

CPC classification number: H04N19/186 ,  H04N19/136 ,  H04N19/176

Abstract: A Local illumination compensation system for video encoding and decoding uses memory for storing illumination compensation parameters and does not require access to reconstructed pixels of neighboring blocks. A set of illumination compensation parameters is stored in a dedicated buffer, which is of limited size, and which is decoupled from the coding unit level storage of information. The buffer contains a set of illumination compensation parameters, which may be, for example, computed (or determined in some other manner) on the fly or determined beforehand (for example for example obtained from the video signal or from a device).