公开(公告)号：US20190313097A1

公开(公告)日：2019-10-10

申请号：US16338476

申请日：2017-08-31

Applicant: INTERDIGITAL VC HOLDINGS, INC.

Inventor： Fabrice URBAN ,  Thierry VIELLARD ,  Fabrice LELEANNEC

IPC: H04N19/122 ,  H04N19/176 ,  H04N13/161

Abstract: A method is proposed for coding a large field of view video into a bitstream, at least one picture of the omnidirectional video being represented as a surface, the surface being projected onto at least one 2D picture using a projection function. Such method comprises, for at least one current block of the at least one 2D picture: adapting (S2400) a size of the at least one current block as a function of a pixel density function determined according to the projection function; and encoding (S2410) the at least one current block into the bitstream using the adapted size.

公开(公告)号：US20200068200A1

公开(公告)日：2020-02-27

申请号：US16346826

申请日：2017-11-21

Applicant: InterDigital VC Holdings, Inc.

Inventor： Franck GALPIN ,  Fabrice LELEANNEC ,  Fabien RACAPE ,  Tangi POIRIER ,  Thierry VIELLARD ,  Fabrice URBAN

IPC: H04N19/147 ,  H04N19/196 ,  H04N19/159 ,  H04N19/105 ,  H04N19/176 ,  G06K9/62

Abstract: Methods and apparatuses for encoding and decoding video are disclosed. The method of encoding video includes assigning (12) a distortion versus quantization curve to a block in a picture of a video based on a perceptual metric classification of the block, determining a quantization parameter (132) for the block based on the distortion versus quantization curve and a target distortion for the block, the target distortion being an overall target distortion for the picture and encoding (16) the block based on the quantization parameter. A bitstream formatted to include encoded data, and computer-readable storage mediums and computer-readable program products for encoding and decoding video are also disclosed.

公开(公告)号：US20200045312A1

公开(公告)日：2020-02-06

申请号：US16339929

申请日：2017-08-31

Applicant: INTERDIGITAL VC HOLDINGS, INC.

Inventor： Tangi POIRIER ,  Fabrice LELEANNEC ,  Franck GALPIN ,  Fabien RACAPE ,  Thierry VIELLARD ,  Fabrice URBAN

IPC: H04N19/119 ,  H04N19/176 ,  H04N19/124 ,  H04N19/147

Abstract: A method and an apparatus for encoding a picture are disclosed. Such method comprises: —determining a rate-distortion cost (41) for a current block of said picture when said current block is not split into subblocks, taking into account quantization parameters assigned to the subblocks of said current block, —determining (42) whether said current block is split or not according at least to the determined rate-distortion cost, —encoding (43) the current block according to the result of determining whether a current block is split or not into subblocks.

公开(公告)号：US20190208200A1

公开(公告)日：2019-07-04

申请号：US16334439

申请日：2017-09-28

Applicant: INTERDIGITAL VC HOLDINGS, INC.

Inventor： Franck GALPIN ,  Fabien RACAPE ,  Thierry VIELLARD

IPC: H04N19/11 ,  H04N19/105 ,  H04N19/176

Abstract: In omnidirectional videos, only some intra prediction directions may be relevant for intra prediction. For example, for a video generated from an equi-rectangular mapping, only the horizontal directions may be relevant for intra prediction around the poles. To improve compression efficiency, we propose to reduce the number of possible directions, based on the location of the block to be encoded or decoded in the frame. In various embodiments, we may adapt the derivation of the MPM in order to take into account the reduction of intra directions depending on geometric distortions. The encoding method can also be adapted to reduce the number of modes to estimate for a block in omnidirectional videos. The coding of the syntax elements representing the intra direction can also be improved.

公开(公告)号：US20190281299A1

公开(公告)日：2019-09-12

申请号：US16336439

申请日：2017-10-05

Applicant: InterDigital VC Holdings, Inc.

Inventor： Fabrice LELEANNEC ,  Tangi POIRIER ,  Thierry VIELLARD

IPC: H04N19/122 ,  H04N19/176 ,  H04N19/61

Abstract: Method and apparatus for encoding and decoding a video. A method and an apparatus for encoding a video are disclosed. Such a method comprises, for at least one block having a size N which is not a power of 2 along at least one dimension: —determining (40) a predicted block for said at least one block, —obtaining (41) a residual block from said at least one block and said predicted block, —performing (42) block transform of said residual block, said residual block having a size N, —encoding (43) said transformed residual block. Corresponding method and apparatus for decoding a video are also disclosed.