公开(公告)号：US20220159260A1

公开(公告)日：2022-05-19

申请号：US17429077

申请日：2020-02-03

Applicant: INTERDIGITAL VC HOLDINGS, INC.

Inventor： Philippe BORDES ,  Fabrice LELEANNEC ,  Tangi POIRIER ,  Fabrice URBAN

IPC: H04N19/132 ,  H04N19/105 ,  H04N19/196 ,  H04N19/176

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.

公开(公告)号：US20220155596A1

公开(公告)日：2022-05-19

申请号：US17440911

申请日：2020-03-18

Applicant: interDigital VC Holdings, Inc.

Inventor： Pierre ANDRIVON ,  Franck GALPIN ,  Fabrice URBAN

IPC: G02B27/01

Abstract: A method and an apparatus are defined for displaying images on a flexible display in a head-mountable device (HMD). One or more flexible display devices may be inserted in the HMD. The one or more flexible display devices may be constrained by the HMD to take a particular curved form and wrap the field of view (FOV) of images displayed on the one or more flexible display devices for an improved user experience. The display surface of the one or more flexible displays may be divided in display areas, the display areas corresponding to a focus area and a peripheral FOV. Image processing may be differentiated features as a function of according to display area.

公开(公告)号：US20220138990A1

公开(公告)日：2022-05-05

申请号：US17260144

申请日：2019-06-24

Applicant: InterDigital VC Holdings, Inc.

Inventor： Julien FLEUREAU ,  Bertrand CHUPEAU ,  Gerard BRIAND ,  Renaud DORE ,  Thierry TAPIE ,  Franck THUDOR

IPC: G06T9/00 ,  G06T15/20 ,  G06T17/20

Abstract: A sequence of three-dimension scenes is encoded as a video by an encoder and transmitted to a decoder which retrieves the sequence of 3D scenes. Points of a 3D scene visible from a determined point of view are encoded as a color image in a first track of the stream in order to be decodable independently from other tracks of the stream. The color image is compatible with a three degrees of freedom rendering. Depth information and depth and color of residual points of the scene are encoded in separate tracks of the stream and are decoded only in case the decoder is configured to decode the scene for a volumetric rendering.

公开(公告)号：US11310505B2

公开(公告)日：2022-04-19

申请号：US17040023

申请日：2019-04-08

Applicant: InterDigital VC Holdings, Inc.

Inventor： Ya Chen ,  Fabrice Le Leannec ,  Tangi Poirier

IPC: H04N19/13 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18

Abstract: A significance-coefficient flag indicates whether a given quantized transform coefficient is equal to zero or not. To encode the significant-coefficient flags, context-based entropy coding can be used. To adapt to the characteristics of a video sequence, the context model is selected based on the statistics of the transform coefficients. In one embodiment, the non-zero probabilities of transform coefficients are compared to different thresholds to divide a transform block into several context regions, where all coefficients in a context region use the same set of context models. In another embodiment, the transform block is first divided into several context regions based on the positions of the transform coefficients, and the non-zero probabilities of transform coefficients are compared with a threshold to divide each context region into two sub-regions, where all coefficients in a sub-region share the same set of context models.

公开(公告)号：US20220116662A1

公开(公告)日：2022-04-14

申请号：US17431819

申请日：2020-03-05

Applicant: InterDigital VC Holdings, Inc.

Inventor： YA Chen ,  Fabrice Le Leannec ,  Tangi Poirier

IPC: H04N19/70 ,  H04N19/46 ,  H04N19/13 ,  H04N19/176

Abstract: Encoding or decoding syntax information associated with video information can involve identifying a coding context associated with a syntax element of a current coding unit of the video information, wherein the identifying occurs without using a syntax element of a neighboring block, and encoding or decoding the syntax element of the current coding unit based on the coding context.

公开(公告)号：US20220086488A1

公开(公告)日：2022-03-17

申请号：US17533235

申请日：2021-11-23

Applicant: INTERDIGITAL VC HOLDINGS, INC.

Inventor： Yang HU ,  Joel SOLE ,  Xiaoan LU ,  Peng YIN ,  Yunfei ZHENG

IPC: H04N19/60 ,  H03M7/40 ,  H04N19/70 ,  H04N19/46 ,  H04N19/13 ,  H04N19/61

Abstract: Methods and apparatus are provided for improved entropy encoding and decoding. An apparatus includes a video encoder (200) for encoding at least a block in a picture by transforming a residue of the block to obtain transform coefficients, quantizing the transform coefficients to obtain quantized transform coefficients, and entropy coding the quantized transform coefficients. The quantized transform coefficients are encoded using a flag to indicate that a current one of the quantized transform coefficients being processed is a last non-zero coefficient for the block having a value greater than or equal to a specified value.

公开(公告)号：US11270417B2

公开(公告)日：2022-03-08

申请号：US17259471

申请日：2019-05-01

Applicant: InterDigital VC Holdings, Inc.

Inventor： Tania Pouli ,  Laurent Cauvin ,  Jonathan Kervec ,  Hassane Guermoud

IPC: G06T5/00 ,  G06T5/50 ,  H04N9/64

Abstract: For the processing of an image with a tone-mapping function, it is known to select a tone-mapping function among a reference collection of reference tone-mapping functions and to apply the selected tone-mapping function to colors of this image. When applying this method to images of a video content, it is proposed to add, after such a selection for an image, a step of validation of this selection for the next images of video content. Advantage: prevent too frequent changes of tone-mapping function inside a video content, lower temporal instabilities and visual discomfort during visualization.

公开(公告)号：US11263731B2

公开(公告)日：2022-03-01

申请号：US16608860

申请日：2018-04-17

Applicant: INTERDIGITAL VC HOLDINGS, INC.

Inventor： Cedric Thebault ,  Marie-Jean Colaitis ,  Angelo Mazzante

IPC: G06T5/00 ,  H04N9/64 ,  H04N9/68

Abstract: The present principles relate to a method and device for gamut mapping from a first color gamut towards a second color gamut. The method comprises, in a plane of constant hue, obtaining a target lightness for a color on the boundary of first gamut with maximum chroma, called first cusp color; and lightness mapping of the color from the first color gamut towards the second color gamut wherein the lightness mapped color is calculated from a parabolic function applied to the color, the parabolic function mapping the first cusp color to a color having the target lightness. According to a particular characteristic, a preserved chroma is also obtained; and in case the chroma of the color is lower than or equal to the preserved chroma, the lightness mapped color is the color, and in case the chroma of the color is higher than the preserved chroma, the lightness mapped color is calculated from the parabolic function applied to the color.

公开(公告)号：US11252435B2

公开(公告)日：2022-02-15

申请号：US17083007

申请日：2020-10-28

Applicant: InterDigital VC Holdings, Inc.

Inventor： Oscar Divorra Escoda ,  Peng Yin

IPC: H04N7/12 ,  H04N19/57 ,  H04N19/119 ,  H04N19/50 ,  H04N19/159 ,  H04N19/176 ,  H04N19/70 ,  H04N19/13 ,  H04N19/61 ,  H04N19/117 ,  H04N19/126 ,  H04N19/146 ,  H04N19/156 ,  H04N19/44 ,  H04N19/543 ,  H04N19/189

Abstract: There are provided methods and apparatus for adaptive geometric partitioning for video encoding and decoding. An apparatus includes an encoder for encoding image data corresponding to pictures by adaptively partitioning at least portions of the pictures responsive to at least one parametric model. The at least one parametric model involves at least one of implicit and explicit formulation of at least one curve.

公开(公告)号：US11245921B2

公开(公告)日：2022-02-08

申请号：US16622895

申请日：2018-06-25

Applicant: InterDigital VC Holdings, Inc.

Inventor： Antoine Robert ,  Fabrice Leleannec ,  Tangi Poirier

IPC: H04N19/513 ,  H04N19/105 ,  H04N19/139 ,  H04N19/176 ,  H04N19/52

Abstract: Different implementations are described, particularly implementations for selecting a predictor candidate from a set of multiple predictor candidates for motion compensation of a picture block based on a motion model. The motion model, may be, e.g., an affine model in a merge mode for a video content encoder or decoder. In an embodiment, a predictor candidate is selected from the set based on a motion model for each of the multiple predictor candidates, and may be based on a criterion such as, e.g., a rate distortion cost. The corresponding motion field is determined based on, e.g., one or more corresponding control point motion vectors for the block being encoded or decoded. The corresponding motion field of an embodiment identifies motion vectors used for prediction of sub-blocks of the block being encoded or decoded.