公开(公告)号：US11706417B2

公开(公告)日：2023-07-18

申请号：US17195798

申请日：2021-03-09

Applicant: Huawei Technologies Co., Ltd.

Inventor： Huanbang Chen ,  Haitao Yang

IPC: H04N19/13 ,  H04N19/159 ,  H04N19/176 ,  H04N19/52 ,  H04N19/70

CPC classification number: H04N19/13 ,  H04N19/159 ,  H04N19/176 ,  H04N19/52 ,  H04N19/70

Abstract: A video decoding method includes obtaining a to-be-entropy-decoded syntax element in a current block by parsing a received bitstream, where the to-be-entropy-decoded syntax element includes a syntax element 1 or a syntax element 2 in the current block, obtaining a context model corresponding to the to-be-entropy-decoded syntax element, where both of a context model corresponding to the syntax element 1 and a context model corresponding to the syntax element 2 are determined from the same preset context model set, entropy decoding the to-be-entropy-decoded syntax element based on the context model corresponding to the to-be-entropy-decoded syntax element, and obtaining a reconstructed image of the current block based on the syntax element obtained by entropy decoding.

公开(公告)号：US11659161B2

公开(公告)日：2023-05-23

申请号：US17189577

申请日：2021-03-02

Applicant: Huawei Technologies Co., Ltd.

Inventor： Huanbang Chen ,  Haitao Yang

IPC: H04N19/105 ,  H04N19/159 ,  H04N19/172 ,  H04N19/176 ,  H04N19/137

CPC classification number: H04N19/105 ,  H04N19/137 ,  H04N19/159 ,  H04N19/172 ,  H04N19/176

Abstract: A reference frame obtaining method includes determining a first reference frame list and a second reference frame list of a current picture block, determining, from the first reference frame list, whether an X-directional reference frame x1 satisfying a condition A1 exists, determining, from the second reference frame list, whether a Y-directional reference frame y1 satisfying a condition B1 exists, and in response to determining that the X-directional reference frame x1 exists and determining that the Y-directional reference frame y1 exists, obtaining index values (R1, R2) of bidirectional reference frames of the current picture block.

公开(公告)号：US11516464B2

公开(公告)日：2022-11-29

申请号：US17180274

申请日：2021-02-19

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Huanbang Chen ,  Haitao Yang ,  Lian Zhang

IPC: H04N19/00 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/30

Abstract: This disclosure discloses a method for obtaining a candidate motion vector list, an apparatus, an encoder, and a decoder. The method for obtaining a candidate motion vector list comprises: when a first candidate picture block is encoded/decoded and an inter prediction mode is used, determining whether a reference picture of the first candidate picture block is the same as a reference picture of a current block; and constructing a candidate motion vector list of the current block based on a determining result; when the reference picture of the first candidate picture block is different from the reference picture of the current block, the MV of the first candidate picture block is not used to construct the list. Implementing this disclosure can reduce complexity of a motion information derivation process, and improve coding efficiency.

公开(公告)号：US11496754B2

公开(公告)日：2022-11-08

申请号：US17366735

申请日：2021-07-02

Applicant: Zhejiang University ,  Huawei Technologies Co., Ltd.

Inventor： Lu Yu ,  Ye-Kui Wang ,  Yuqun Fan ,  Hualong Yu ,  Yin Zhao ,  Xiangyu Lin ,  Haitao Yang

IPC: H04N19/184 ,  H04N19/136 ,  H04N19/172 ,  H04N19/124

Abstract: A decoding method includes obtaining an identifier from a bitstream, where the identifier indicates a minimum decoding time interval k between library pictures that is allowed in the bitstream, obtaining, when parsing the bitstream, a decoding moment ti of a current decoded picture and a decoding moment tj of a first decoded picture that is closest to the current decoded picture and that references a new library picture when the current decoded picture is decoded by referencing a library picture, where the new library picture is a library picture that is not decoded or needs to be re-decoded when the first decoded picture is decoded, and determining a preset quantity of library pictures as candidate reference pictures of the current decoded picture based on a relationship between k and a difference between ti and tj.

公开(公告)号：US20220264134A1

公开(公告)日：2022-08-18

申请号：US17732205

申请日：2022-04-28

Applicant: Huawei Technologies Co., Ltd.

Inventor： Yin Zhao ,  Haitao Yang ,  Jianle Chen

IPC: H04N19/44 ,  H04N19/12 ,  H04N19/176 ,  H04N19/61 ,  H04N19/625 ,  H04N19/124 ,  H04N19/184 ,  H04N19/51

Abstract: A video decoding method, including: parsing a received bitstream to obtain prediction information of a coding unit (CU); obtaining a target transform mode of a residual transform unit (TU); parsing the received bitstream to obtain transform coefficients of the residual TU; applying an inverse quantization to the transform coefficients of the residual TU to obtain dequantized coefficients; applying, based on the target transform mode, an inverse transform to the dequantized coefficients to obtain a residual block of the residual TU; obtaining a prediction block of the CU based on the prediction information; obtaining a video block based on the residual block and the prediction block; and outputting a video sequence including a video frame that includes the video block.

公开(公告)号：US11388428B2

公开(公告)日：2022-07-12

申请号：US17191934

申请日：2021-03-04

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Yin Zhao ,  Haitao Yang

IPC: H04N19/44 ,  H04N19/105 ,  H04N19/13 ,  H04N19/176 ,  H04N19/169

Abstract: The present disclosure discloses a video decoding method and a video decoder. The method includes: parsing coding tree split information to obtain a current node; determining coordinates of an upper-left corner of a region covered by a current quantization group based on a depth N of the current node; obtaining a QP delta of a current CU in the region covered by the current quantization group; and obtaining a reconstructed picture of the current CU based on the QP delta of the current CU.

公开(公告)号：US11388402B2

公开(公告)日：2022-07-12

申请号：US16838948

申请日：2020-04-02

Applicant: Huawei Technologies Co., Ltd.

Inventor： Yin Zhao ,  Haitao Yang ,  Jianle Chen

IPC: H04N19/61 ,  H04N19/12 ,  H04N19/147 ,  H04N19/176 ,  H04N19/625 ,  H04N19/96

Abstract: A mechanism for position dependent spatial varying transform (SVT) for video coding. A prediction block and a corresponding transformed residual block are received at a decoder. A type of spatial varying transform (SVT) employed to generate the transformed residual block is determined. A position of the SVT relative to the transformed residual block is also determined. An inverse of the SVT is applied to the transformed residual block to reconstruct a reconstructed residual block. The reconstructed residual block is then combined with the prediction block to reconstruct an image block.

公开(公告)号：US11388399B2

公开(公告)日：2022-07-12

申请号：US17369350

申请日：2021-07-07

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Yin Zhao ,  Haitao Yang ,  Jianle Chen ,  Lian Zhang

IPC: H04N19/107 ,  H04N19/157 ,  H04N19/176 ,  H04N19/186 ,  H04N19/593

Abstract: An image prediction method, apparatus, and system, a device, and a storage medium are provided. The method includes: (401) obtaining a split mode of a current node, where the current node is an image block in a coding tree unit in a current image; (402) determining, based on the split mode of the current node and a size of the current node, whether the current node satisfies a first condition; and (403) when it is determined that the current node satisfies the first condition, performing intra prediction on all coding blocks belonging to the current node, to obtain predictors of all the coding blocks belonging to the current node.

公开(公告)号：US11290724B2

公开(公告)日：2022-03-29

申请号：US16894268

申请日：2020-06-05

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Shan Gao ,  Weiwei Xu ,  Huanbang Chen ,  Haitao Yang

IPC: H04N19/139 ,  H04N19/176 ,  H04N19/56 ,  H04N19/573

Abstract: An inter prediction method includes parsing, by a processor, a bitstream to obtain a location of a target adjacent image block of a current image block. The method further includes obtaining a preset correspondence between an adjacent image block location and a motion vector precision, wherein in the preset correspondence, locations of at least two adjacent image blocks correspond to different motion vector precisions. The method further includes determining, based on the location of the target adjacent image block and the preset correspondence, a target motion vector precision corresponding to the target adjacent image block. The method further includes determining a motion vector predictor of the current image block based on the location of the target adjacent image block and the target motion vector precision.

公开(公告)号：US20220078442A1

公开(公告)日：2022-03-10

申请号：US17478697

申请日：2021-09-17

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Huanbang Chen ,  Haitao Yang ,  Jianle Chen

IPC: H04N19/139 ,  H04N19/176 ,  H04N19/174 ,  H04N19/172 ,  H04N19/119 ,  H04N19/52

Abstract: The present disclosure relates to an apparatus, an encoder, a decoder and corresponding methods for prediction refinement with optical flow (PROF) for an affine coded block, in which when a plurality of optical flow decision conditions are fulfilled for the affine coded block, performing a PROF process for a current sub-block of the affine coded block to obtain refined prediction sample values of the current sub-block of the affine coded block. After the sub-block based affine motion compensation is performed, a prediction sample value of the current sample of the current sub-block is refined by adding a delta prediction value. Thus, it allows for a better trade-off between coding complexity and prediction accuracy.