公开(公告)号：US20250071336A1

公开(公告)日：2025-02-27

申请号：US18943189

申请日：2024-11-11

Applicant: CANON KABUSHIKI KAISHA

Inventor： Guillaume LAROCHE ,  Naël OUEDRAOGO ,  Patrice ONNO

IPC: H04N19/70 ,  H04N19/174

Abstract: There is described a method of decoding video data from a bitstream. The bitstream comprising video data corresponding to one or more slices. The decoding comprises parsing the syntax elements, and not permitting use of a subpicture and/or parsing of subpicture information in combination with at least one syntax element that indicates that a picture to be decoded contains only one slice. The bitstream is decoded using said syntax elements.

公开(公告)号：US20240397116A1

公开(公告)日：2024-11-28

申请号：US18796142

申请日：2024-08-06

Applicant: CANON KABUSHIKI KAISHA

Inventor： Christophe GISQUET ,  Jonathan TAQUET ,  Patrice ONNO ,  Guillaume LAROCHE

IPC: H04N19/82 ,  H04N19/117 ,  H04N19/14 ,  H04N19/176 ,  H04N19/182 ,  H04N19/86

Abstract: A method of filtering a block of pixels in an image, comprising obtaining a first clipping control parameter (tc) value based on a quantization parameter of the block; comparing a first value of a first pixel located on one side of an edge in said block and a second value of a second pixel located on the other side of the edge in said block with a predetermined threshold derived from the first clipping control parameter value; and determining whether to apply a strong filtering to the first pixel based on the result of the comparison, wherein: the strong filtering comprises filtering the first pixel value so that the filtered first pixel value differs from the first pixel value by no more than a range value based on the clipping control parameter (tc), the ration between two range values corresponding to successive values of bitdepths being strictly lower than 2.

公开(公告)号：US20240372998A1

公开(公告)日：2024-11-07

申请号：US18652694

申请日：2024-05-01

Applicant: CANON KABUSHIKI KAISHA

Inventor： Jonathan TAQUET ,  Christophe GISQUET ,  Guillaume LAROCHE ,  Patrice ONNO

IPC: H04N19/117 ,  H04N19/176 ,  H04N19/186 ,  H04N19/46 ,  H04N19/82

Abstract: A method of controlling an Adaptive Loop Filter comprises obtaining for a slice containing one or more coding tree blocks, data indicating a number of available alternative chroma filters, obtaining for a coding tree block in the slice, an alternative filter index identifying one of the available alternative chroma filters, and selecting the alternative chroma filter identified by the index to filter chroma image data in the coding tree block.

公开(公告)号：US20240364877A1

公开(公告)日：2024-10-31

申请号：US18652687

申请日：2024-05-01

Applicant: CANON KABUSHIKI KAISHA

Inventor： Jonathan TAQUET ,  Christophe GISQUET ,  Guillaume LAROCHE ,  Patrice ONNO

IPC: H04N19/117 ,  H04N19/176 ,  H04N19/186 ,  H04N19/46 ,  H04N19/82

CPC classification number: H04N19/117 ,  H04N19/176 ,  H04N19/186 ,  H04N19/46 ,  H04N19/82

Abstract: A method of controlling an Adaptive Loop Filter comprises obtaining for a slice containing one or more coding tree blocks, data indicating a number of available alternative chroma filters, obtaining for a coding tree block in the slice, an alternative filter index identifying one of the available alternative chroma filters, and selecting the alternative chroma filter identified by the index to filter chroma image data in the coding tree block.

公开(公告)号：US20240348779A1

公开(公告)日：2024-10-17

申请号：US18652710

申请日：2024-05-01

Applicant: CANON KABUSHIKI KAISHA

Inventor： Jonathan TAQUET ,  Christophe GISQUET ,  Guillaume LAROCHE ,  Patrice ONNO

IPC: H04N19/117 ,  H04N19/176 ,  H04N19/186 ,  H04N19/46 ,  H04N19/82

CPC classification number: H04N19/117 ,  H04N19/176 ,  H04N19/186 ,  H04N19/46 ,  H04N19/82

Abstract: A method of controlling an Adaptive Loop Filter comprises obtaining for a slice containing one or more coding tree blocks, data indicating a number of available alternative chroma filters, obtaining for a coding tree block in the slice, an alternative filter index identifying one of the available alternative chroma filters, and selecting the alternative chroma filter identified by the index to filter chroma image data in the coding tree block.

公开(公告)号：US20230370594A1

公开(公告)日：2023-11-16

申请号：US18355933

申请日：2023-07-20

Applicant: CANON KABUSHIKI KAISHA

Inventor： Jonathan TAQUET ,  Christophe GISQUET ,  Guillaume LAROCHE ,  Patrice ONNO

IPC: H04N19/117 ,  H04N19/86 ,  H04N19/132 ,  H04N19/176 ,  H04N19/136

CPC classification number: H04N19/117 ,  H04N19/86 ,  H04N19/132 ,  H04N19/176 ,  H04N19/136

Abstract: A method of controlling an Adaptive Loop Filter for one or more image portions of an image, the method comprising controlling filtering on a first sample of an image portion based on one or more neighbouring sample value(s) of the first sample value, wherein the controlling uses a nonlinear function which has one or more variables based on one or more of the neighbouring sample value(s).

公开(公告)号：US20230121486A1

公开(公告)日：2023-04-20

申请号：US17914096

申请日：2021-03-22

Applicant: CANON KABUSHIKI KAISHA

Inventor： Naël OUEDRAOGO ,  Patrice ONNO ,  Guillaume LAROCHE

IPC: H04N19/70 ,  H04N19/426 ,  H04N19/169 ,  H04N19/172

Abstract: A sequence of images is encoded in a bitstream as a series of picture units PU-01˜03. Each picture unit corresponds to one encoded image and includes one or more network abstraction layer (NAL) units NAL-01˜23. The NAL units may be video coding layer (VCL) NAL units which each contain encoded image data or adaptation parameter set NAL units which each contain an adaptation parameter set (APS) having parameters for performing one or more types of processing operation on the image data contained in one or more VCL NAL units. The APS NAL units may be prefix APS NAL units P-APS or suffix APS NAL units S-APS. An additional constraint is applied to the bitstream prohibiting inclusion, in a picture unit, of a prefix APS NAL unit after the first NAL unit of the picture unit concerned. This can avoid more than one APS applying to slices belonging to the same picture unit, and hence reduce the size of an APS buffer. Alternatively, or in addition, it is permitted to include, in the same picture unit, of a prefix APS NAL unit and a suffix APS NAL unit having the same APS type and the same APS identifier but different contents. This can reduce rewriting operations when performing random access decoding at a specific timing in the coded video sequence.

公开(公告)号：US20220360804A1

公开(公告)日：2022-11-10

申请号：US17752677

申请日：2022-05-24

Applicant: CANON KABUSHIKI KAISHA

Inventor： Guillaume LAROCHE ,  Christophe GISQUET ,  Patrice ONNO ,  Jonathan TAQUET

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

Abstract: The invention relates to signalling affine mode in an encoded video stream; in particular determining a list of merge candidates corresponding to blocks neighbouring a current block; and signalling affine mode for said current block; wherein signalling said affine mode comprises decoding a context encoded flag from the data stream, and wherein the context variable for said flag is determined based on whether or not said neighbouring blocks use affine mode. Related encoding and decoding methods and devices are also disclosed.

公开(公告)号：US20220094989A1

公开(公告)日：2022-03-24

申请号：US17541058

申请日：2021-12-02

Applicant: CANON KABUSHIKI KAISHA

Inventor： Christophe GISQUET ,  Jonathan TAQUET ,  Patrice ONNO ,  Guillaume LAROCHE

IPC: H04N19/82 ,  H04N19/117 ,  H04N19/14 ,  H04N19/176 ,  H04N19/182 ,  H04N19/86

Abstract: A method of filtering a block of pixels in an image, comprising obtaining a first clipping control parameter (tc) value based on a quantization parameter of the block; comparing a first value of a first pixel located on one side of an edge in said block and a second value of a second pixel located on the other side of the edge in said block with a predetermined threshold derived from the first clipping control parameter value; and determining whether to apply a strong filtering to the first pixel based on the result of the comparison, wherein: the strong filtering comprises filtering the first pixel value so that the filtered first pixel value differs from the first pixel value by no more than a range value based on the clipping control parameter (tc), the ration between two range values corresponding to successive values of bitdepths being strictly lower than 2.

公开(公告)号：US20210352275A1

公开(公告)日：2021-11-11

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 ,  H04N19/70 ,  H04N19/176

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.