公开(公告)号：US11178412B2

公开(公告)日：2021-11-16

申请号：US16408639

申请日：2019-05-10

Applicant: INTERDIGITAL VC HOLDINGS, INC.

Inventor： Sebastien Lasserre ,  Pierre Andrivon ,  Fabrice Leleannec ,  David Touze

IPC: H04N19/186 ,  H04N19/30 ,  H04N19/85 ,  H04N19/00 ,  H04N19/98

Abstract: The present disclosure generally relates to a method and device of encoding a color picture having color components (Ec) comprising obtaining (11) a luminance component (L) and two chrominance components (C1, C2) from the color picture to be encoded. The method for encoding a color picture having color components comprising obtaining at least one chrominance component from the color picture to be encoded, characterized in that the method further comprises: determining a first factor based on the value of each pixel (i) of said luminance component; obtaining at least one final chrominance component by scaling said at least one chrominance component by said first factor; and encoding (13) said at least one final chrominance component.

公开(公告)号：US11032579B2

公开(公告)日：2021-06-08

申请号：US16086240

申请日：2017-03-13

Applicant: INTERDIGITAL VC HOLDINGS, INC

Inventor： Pierre Andrivon ,  Sebastien Lasserre ,  David Touze ,  Edouard Francois

IPC: G06T5/00 ,  G06T9/00 ,  H04N19/186 ,  H04N19/98 ,  G06T3/40

Abstract: A decoding method is disclosed that comprises:—decoding (S120) a stream to obtain a decoded standard dynamic range picture and colour metadata associated with the standard dynamic range picture, wherein the colour metadata are representative at least of characteristics of a high dynamic range picture associated with the standard dynamic range picture; and—reconstructing (S130) a high dynamic range access the input stream(s) picture from the decoded standard dynamic range picture and from the colour metadata.

公开(公告)号：US10721484B2

公开(公告)日：2020-07-21

申请号：US15761100

申请日：2016-09-19

Applicant: InterDigital VC Holdings, Inc.

Inventor： Fabrice Le Leannec ,  Sebastien Lasserre ,  Edouard Francois ,  Franck Galpin

IPC: H04N19/186 ,  G06T9/00 ,  H04N19/59 ,  G06T5/00

Abstract: A method for determining a luminance value used to process color samples in a decoder or encoder is provided comprising determining (33, 44) a luminance sample associated with a chroma sample position in a common space; and applying (34, 492) the determined luminance sample in a process that depends on luminance that is being applied to the chroma sample.

公开(公告)号：US10511863B2

公开(公告)日：2019-12-17

申请号：US15546646

申请日：2016-01-28

Applicant: INTERDIGITAL VC HOLDINGS, INC.

Inventor： Sebastien Lasserre ,  Fabrice Leleannec ,  David Touze

IPC: G06K9/00 ,  H04N19/98 ,  H04N19/186 ,  H04N19/85 ,  H04N19/117

Abstract: A method is disclosed that comprises mapping a high-dynamic range luminance picture to a standard-dynamic range luminance picture based on a backlight value Bac associated with the high-dynamic range luminance picture.

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.

公开(公告)号：US11683505B2

公开(公告)日：2023-06-20

申请号：US16490589

申请日：2018-02-21

Applicant: INTERDIGITAL VC HOLDINGS, INC.

Inventor： Saurabh Puri ,  Sebastien Lasserre ,  Patrick Le Callet

IPC: H04N19/184 ,  H04N19/176 ,  H04N19/18 ,  H04N19/44

CPC classification number: H04N19/184 ,  H04N19/176 ,  H04N19/18 ,  H04N19/44

Abstract: A decoding method is disclosed. The decoding method comprises:



determining an index from a bitstream, the index identifying a coding element in a set of a plurality of coding elements;
decoding a picture block from the bitstream using the coding element of the set identified by the index.




In a specific embodiment, determining the index comprises:



determining, for each coding element in the set, a probability that the coding element was used for encoding the picture block; and
determining the index responsive to the determined probabilities.

公开(公告)号：US11627339B2

公开(公告)日：2023-04-11

申请号：US16616491

申请日：2018-04-12

Applicant: INTERDIGITAL VC HOLDINGS, INC.

Inventor： Kangying Cai ,  Wei Hu ,  Sebastien Lasserre

IPC: H04N19/62 ,  H04N19/18

Abstract: This method comprises: —accessing (2) 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;—segmenting (2) the point cloud into one or more clusters (Ci) of points on the basis of the attributes of the points; and for at least one cluster (Ci):—constructing (4) 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 (Ci) in terms of the attributes, the plurality of vertices including vertices Pi and Pj corresponding to points of the cluster (Ci);—assigning one or more weights wi,j to one or more edges connecting vertices Pi and Pj of the graph;—computing (6) a transform using the one or more assigned weights, said transform being characterized by coefficients; and—quantizing (8) and encoding (10) the transform coefficients.

公开(公告)号：US11496752B2

公开(公告)日：2022-11-08

申请号：US16317228

申请日：2017-07-12

Applicant: INTERDIGITAL VC HOLDINGS, INC.

Inventor： Sebastien Lasserre ,  Saurabh Puri ,  Patrick Le Callet

IPC: H04N19/18 ,  H04N19/13 ,  H04N19/176 ,  H04N19/60 ,  H04N19/91 ,  H04N19/12 ,  H04N19/147 ,  H04N19/132 ,  H04N19/463 ,  H04N19/192

Abstract: 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.

公开(公告)号：US11317108B2

公开(公告)日：2022-04-26

申请号：US16655558

申请日：2019-10-17

Applicant: INTERDIGITAL VC HOLDINGS, INC.

Inventor： Sebastien Lasserre ,  Fabrice Leleannec ,  Yannick Olivier

IPC: H04N19/44 ,  H04N19/30 ,  H04N19/136 ,  H04N19/186 ,  H04N19/126 ,  H04N19/98

Abstract: The present disclosure generally relates to a device and a method of decoding a color picture from a bitstream. It comprises: obtaining an expanded range luminance as a first component by applying a nonlinear dynamic expansion function to a luminance component obtained from the bitstream, wherein said nonlinear dynamic expansion function is determined depending on an inverse of a dynamic reduction function that has been applied to an original luminance component obtained when encoding the color picture; obtaining a second component by calculating a square root of a difference between a value determined by the first component and another value computed as a linear combination of a multiplication product of two chrominance components and square values of the two chrominance components obtained from the bitstream; and obtaining at least one color component of the color picture to be decoded at least from said second component and said two chrominance components by determining said at least one color component as a linear combination of the second component and the two chrominance components.

公开(公告)号：US11250597B2

公开(公告)日：2022-02-15

申请号：US16756352

申请日：2018-10-17

Applicant: InterDigital VC Holdings, Inc.

Inventor： Sebastien Lasserre ,  Celine Guede ,  Jean-Claude Chevet

IPC: G06T9/40 ,  G06T9/00

Abstract: The present principles generally relate to encoding and decoding of a point cloud representing the geometry of a point cloud representing a 3D object. According to the invention, prediction is used in the encoding process of the splitting information of the local octree-based structure and/or in the 10 encoding process of the occupancy information of the leaf cubes of the local octree-based structure. A predictor of the local octree-based structure is used for determining the context of the context-dependent entropy encoding in order to reduce the number of bits needed for the octree encoding.