公开(公告)号：US12167028B2

公开(公告)日：2024-12-10

申请号：US18171154

申请日：2023-02-17

Applicant: CANON KABUSHIKI KAISHA

Inventor： Guillaume Laroche ,  Christophe Gisquet ,  Patrice Onno ,  Jonathan Taquet

IPC: H04N19/56 ,  H04N19/13 ,  H04N19/184

Abstract: A method of encoding a motion vector predictor index, in particular a Merge index, comprises generating a list of motion vector predictor candidates, in particular merge candidates. The list includes an ATMVP candidate. One of the motion vector predictor candidates in the list is selected. A motion vector predictor index for the selected motion vector predictor candidate is generated using CABAC coding. One or more bits of the motion vector predictor index are bypass CABAC coded. For example, only the first bit of the motion vector predictor index is CABAC coded using a single context.

公开(公告)号：US12034953B2

公开(公告)日：2024-07-09

申请号：US17275091

申请日：2019-09-18

Applicant: CANON KABUSHIKI KAISHA

Inventor： Guillaume Laroche ,  Christophe Gisquet ,  Patrice Onno ,  Jonathan Taquet

IPC: H04N19/46 ,  H04N19/105 ,  H04N19/13 ,  H04N19/176

CPC classification number: H04N19/46 ,  H04N19/105 ,  H04N19/13 ,  H04N19/176

Abstract: A signalling affine mode in an encoded video stream; in particular determining an inter prediction mode used for a portion of a bitstream and signalling affine motion mode in dependence on said inter prediction mode used in said portion of said bitstream. Related encoding and decoding methods and devices are also disclosed.

公开(公告)号：US12010319B2

公开(公告)日：2024-06-11

申请号：US18319237

申请日：2023-05-17

Applicant: CANON KABUSHIKI KAISHA

Inventor： Patrice Onno ,  Christophe Gisquet ,  Guillaume Laroche ,  Jonathan Taquet

IPC: H04N19/00 ,  H04N19/105 ,  H04N19/132 ,  H04N19/176 ,  H04N19/186 ,  H04N19/189

CPC classification number: H04N19/132 ,  H04N19/105 ,  H04N19/176 ,  H04N19/186 ,  H04N19/189

Abstract: The disclosure regards cross-component prediction and methods for deriving of a linear model for obtaining a first-component sample for a first-component block from an associated reconstructed second-component sample of a second-component block in the same frame, the method comprising determining the parameters of a linear equation representing a straight line passing through two points, each point being defined by two variables, the first variable corresponding to a second-component sample value, the second variable corresponding to a first-component sample value, based on reconstructed samples of both the first-component and the second-component; and deriving the linear model defined by the straight line parameters; wherein said determining the parameters uses integer arithmetic.

公开(公告)号：US11979581B2

公开(公告)日：2024-05-07

申请号：US18163743

申请日：2023-02-02

Applicant: CANON KABUSHIKI KAISHA

Inventor： Guillaume Laroche ,  Patrice Onno ,  Jonathan Taquet ,  Christophe Gisquet

IPC: H04N19/137 ,  H04N19/119 ,  H04N19/176 ,  H04N19/52

CPC classification number: H04N19/137 ,  H04N19/119 ,  H04N19/176 ,  H04N19/52

Abstract: The present disclosure concerns a method and a device for encoding or decoding video data. It concerns more particularly the encoding according to a particular encoding mode using a decoder side motion vector derivation mode referenced as frame-rate up conversion mode or FRUC mode. It concerns encoding and decoding improvement which reduce the need for memory accesses when using an encoding mode where the motion information is predicted using a decoder side motion vector derivation method.

公开(公告)号：US11979579B2

公开(公告)日：2024-05-07

申请号：US18163610

申请日：2023-02-02

Applicant: CANON KABUSHIKI KAISHA

Inventor： Guillaume Laroche ,  Patrice Onno ,  Jonathan Taquet ,  Christophe Gisquet

IPC: H04N19/137 ,  H04N19/119 ,  H04N19/176 ,  H04N19/52

CPC classification number: H04N19/137 ,  H04N19/119 ,  H04N19/176 ,  H04N19/52

Abstract: The present disclosure concerns a method and a device for encoding or decoding video data. It concerns more particularly the encoding according to a particular encoding mode using a decoder side motion vector derivation mode referenced as frame-rate up conversion mode or FRUC mode. It concerns encoding and decoding improvement which reduce the need for memory accesses when using an encoding mode where the motion information is predicted using a decoder side motion vector derivation method.

公开(公告)号：US11516466B2

公开(公告)日：2022-11-29

申请号：US17283163

申请日：2019-10-18

Applicant: CANON KABUSHIKI KAISHA

Inventor： Guillaume Laroche ,  Christophe Gisquet ,  Patrice Onno ,  Jonathan Taquet

IPC: H04N19/105 ,  H04N19/13 ,  H04N19/176 ,  H04N19/70

Abstract: A method of encoding a motion information predictor index, comprising: generating a list of motion information predictor candidates; when an Affine Merge mode is used, selecting one of the motion information predictor candidates in the list as an Affine Merge mode predictor; when a non-Affine Merge mode is used, selecting one of the motion information predictor candidates in the list as a non-Affine Merge mode predictor; and generating a motion information predictor index for the selected motion information predictor candidate using CABAC coding, one or more bits of the motion information predictor index being bypass CABAC coded.

公开(公告)号：US10972742B2

公开(公告)日：2021-04-06

申请号：US15105521

申请日：2014-12-18

Applicant: CANON KABUSHIKI KAISHA

Inventor： Christophe Gisquet ,  Patrice Onno ,  Guillaume Laroche

IPC: H04N19/186 ,  G09G5/06 ,  H04N19/147 ,  H04N19/176 ,  H04N19/124 ,  H04N1/64 ,  H04N19/94 ,  H04N19/182 ,  H04N19/593 ,  H04N19/50

Abstract: The present invention is related to video coding and decoding, in particular HEVC RExt that define a palette coding mode dedicated to the coding of screen contents. In improved palette coding modes according to the invention, when building a palette, each time a new pixel is added to the class a palette entry defines, the palette entry is modified to take the means value of the pixels belonging to such class. In other improved palette coding modes, a built palette is post-processed to substitute a palette entry with a close entry of a palette predictor PRED. In yet other embodiments, palette coding modes having different threshold values to drive the building of their respective palettes are successively tested to use the best one in terms of rate-distortion criterion.

公开(公告)号：US10861195B2

公开(公告)日：2020-12-08

申请号：US15990496

申请日：2018-05-25

Applicant: CANON KABUSHIKI KAISHA

Inventor： Patrice Onno ,  Guillaume Laroche ,  Christophe Gisquet

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

Abstract: The invention relates to the valence-based encoding of connectivity data of a 3D mesh. A command is generated for each free edge of each vertex traversed and describes the vertex at the other end of the edge. The obtained list of commands is encoded by mapping each command onto a symbol. A mapping table associating commands with a set of respective consecutive numeral symbols is used. The list of symbols is then encoded, separately to the encoding of parameters of the commands. A joint encoding may be used to encode two or more consecutive symbols using a single coding word. A look-up table may be used based on the valence values intrinsically defined by each symbol, in order to give priority to the most frequent valence values (usually around 6). Prior to generating the commands, a vertex may be added to the 3D mesh to artificially fill any hole therein.

公开(公告)号：US10535162B2

公开(公告)日：2020-01-14

申请号：US15855352

申请日：2017-12-27

Applicant: CANON KABUSHIKI KAISHA

Inventor： Guillaume Laroche ,  Patrice Onno ,  Christophe Gisquet

IPC: G06T9/20 ,  G06T9/40

Abstract: Encoding and decoding of property data, such as colour values, associated with vertices forming 3D objects. From an analysis of connectivity data, a spiral-like scanning path of the vertices within the 3D model is obtained. The colour values are mapped to a 2D image, each attribute value to a pixel. Next, the mapped 2D image is encoded. To increase redundancies in the 2D image, the spiral-like path is split into path segments, each forming a turn in the spiral; each path segment is assigned to a respective line of the 2D image; and the colour values of each path segment are mapped, in the same order, to the respective line of the 2D image. Successive lines in the 2D image thus contain the colour values of neighbouring vertices in the 3D object, and a better encoding can be achieved.

公开(公告)号：US10448021B2

公开(公告)日：2019-10-15

申请号：US16058396

申请日：2018-08-08

Applicant: CANON KABUSHIKI KAISHA

Inventor： Christophe Gisquet ,  Guillaume Laroche

IPC: H04N19/46 ,  H04N19/52 ,  H04N19/65 ,  H04N19/89 ,  H04N19/103 ,  H04N19/139 ,  H04N19/176 ,  H04N19/192

Abstract: For an image portion to encode an initial set of motion information predictors is obtained. It is tested whether the number of motion information predictors in the initial set is lower than a target number and, if so, one or more motion information predictors are added to the initial set to generate a set of motion information predictors having controlled diversity. The motion information predictors of the initial set are actual motion information predictors, having motion vectors obtained from image portions of the image being encoded or of a reference image, and potential motion information predictors for addition include one or more further such actual motion information predictors and also include one or more virtual motion information predictors not having motion vectors obtained from image portions of said image being encoded or of a reference image. A motion information predictor for the image portion to encode is selected from the generated set of motion information predictors.