公开(公告)号：US20220417515A1

公开(公告)日：2022-12-29

申请号：US17295634

申请日：2019-12-02

Applicant: InterDigital VC Holdings, Inc.

Inventor： Ya Chen ,  Tangi Poirier ,  Karam Naser

IPC: H04N19/129 ,  H04N19/18 ,  H04N19/13 ,  H04N19/147 ,  H04N19/176

Abstract: An encoding method is presented. Transform coefficients of a block are first obtained. They are then scanned according to a scan pattern for entropy coding. The scan pattern is determined responsive to a shape of the block.
FIG. 5

公开(公告)号：US11539951B2

公开(公告)日：2022-12-27

申请号：US17296729

申请日：2019-12-02

Applicant: InterDigital VC Holdings, Inc.

Inventor： Karam Naser ,  Fabrice Leleannec ,  Tangi Poirier

IPC: H04N19/12 ,  H04N19/176 ,  H04N19/18 ,  H04N19/60

Abstract: A decoding method is presented. a type of split of a block into transform units is first decoded. A transform is then determined for each transform unit of said block responsive to said type of split. Finally, decoded transform coefficients of said transform units are inverse transformed using the determined transforms.

公开(公告)号：US11483562B2

公开(公告)日：2022-10-25

申请号：US16955859

申请日：2018-12-12

Applicant: InterDigital VC Holdings, Inc.

Inventor： Fabrice Leleannec ,  Tangi Poirier ,  Ya Chen ,  Edouard Francois

IPC: H04N19/13 ,  H04N19/157 ,  H04N19/176 ,  H04N19/96

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.

公开(公告)号：US20220060743A1

公开(公告)日：2022-02-24

申请号：US17280218

申请日：2019-10-01

Applicant: InterDigital VC Holdings, Inc.

Inventor： Philippe Bordes ,  Fabrice Le Leannec ,  Tangi Poirier ,  Philippe De Lagrange

IPC: H04N19/577 ,  H04N19/70 ,  H04N19/44 ,  H04N19/176

Abstract: A decoding method is presented. At least one high level syntax element is decoded that indicates whether generalized bi-prediction applies for predicting blocks of a slice. A block is then decoded from said slice using generalized bi-prediction in the case where said at least one high level syntax element indicates to apply generalized bi-prediction.

公开(公告)号：US20210385471A1

公开(公告)日：2021-12-09

申请号：US17290302

申请日：2019-10-31

Applicant: InterDigital VC Holdings, Inc.

Inventor： Fabrice Le Leannec ,  Tangi Poirier ,  Karam Naser

IPC: H04N19/436 ,  H04N19/124

Abstract: At least a method and an apparatus are presented for encoding or decoding video and can involve, for example, obtaining a group of coding units including two or more of a plurality of coding units divided from a current block wherein the two or more of the plurality of coding units share a coding parameter, and the group of coding units overlaps at least two different pipeline units associated with a pipelined decoding operation, and encoding or decoding the current block based on the group of coding units, and the shared coding parameter.

公开(公告)号：US11172221B2

公开(公告)日：2021-11-09

申请号：US16624472

申请日：2018-06-25

Applicant: INTERDIGITAL VC HOLDINGS, INC.

Inventor： Tangi Poirier ,  Gagan Rath ,  Fabrice Urban

IPC: H04N19/593 ,  H04N19/176 ,  H04N19/182 ,  H04N19/96

Abstract: A method of performing intra prediction for encoding or decoding uses multiple layers of reference samples. The layers are formed into reference arrays that are used by a function, such as a weighted combination, to form a final prediction. The prediction is used in encoding or decoding a block of video data. The weights can be determined in a number of ways, and for a given prediction mode, the same weights, or different weights can be used for all pixels in a target block. If the weights are varied, they can depend on the distance of the target pixel from reference arrays.

公开(公告)号：US11122296B2

公开(公告)日：2021-09-14

申请号：US16477021

申请日：2018-01-05

Applicant: INTERDIGITAL VC HOLDINGS, INC.

Inventor： Fabrice Leleannec ,  Franck Galpin ,  Tangi Poirier

IPC: H04N19/61 ,  H04N19/105 ,  H04N19/119 ,  H04N19/13 ,  H04N19/176

Abstract: A coding unit having a size multiple of three in horizontal or vertical direction is coded through one of several embodiments. In one embodiment, for some block sizes, the coding unit is coded and decoded systematically through SKIP mode. In another embodiment, the coding units can be coded in SKIP mode or with a DC coefficient. In another embodiment, an asymmetric division of a common coding unit parent is performed and transform coefficients are factorized among at least two sub-blocks to encode a coding unit. In another embodiment, a separable two dimensional transform can be applied by applying a transform over the block in one direction, and using two one-dimensional transforms on sub-blocks in the other direction to code. Methods, apparatus, and signal embodiments are provided for encoding and decoding.

公开(公告)号：US20210144391A1

公开(公告)日：2021-05-13

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

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：US10939108B2

公开(公告)日：2021-03-02

申请号：US16477452

申请日：2017-12-27

Applicant: InterDigital VC Holdings, Inc.

Inventor： Fabrice Leleannec ,  Tangi Poirier ,  Fabrice Urban

IPC: H04N19/00 ,  H04N19/124 ,  H04N19/176 ,  H04N19/60

Abstract: A decoding method is disclosed that comprises: —decoding a block of transform coefficients from a bitstream; —de-quantizing the decoded block of transform coefficients by a quantization step size; —scaling said dequantized block by a scaling factor; and —transforming said scaled block into an image block, wherein the scaling factor's value depends on whether at least one of the width and the height of the block is a power of 2.

公开(公告)号：US10462492B2

公开(公告)日：2019-10-29

申请号：US15353045

申请日：2016-11-16

Applicant: INTERDIGITAL VC HOLDINGS, INC.

Inventor： Fabrice Leleannec ,  Sebastien Lasserre ,  Franck Galpin ,  Tangi Poirier ,  Patrick Lopez ,  Yannick Olivier ,  Edouard Francois

IPC: H04N19/70 ,  H04N19/136 ,  H04N19/65 ,  H04N19/196 ,  H04N19/98

Abstract: A method for coding an HDR picture is disclosed that includes mapping the HDR picture to obtain a SDR picture, determining color correcting parameters, color correcting said SDR picture responsive to said color correcting parameters, and encoding the color corrected SDR picture in a stream. In the method, determining color correcting parameters includes determining an intermediate SDR picture so that at least one color appearance value is preserved between said HDR picture and said intermediate SDR picture, and determining the color correcting parameters from said intermediate SDR picture and from said SDR picture.