公开(公告)号：US20230135166A1

公开(公告)日：2023-05-04

申请号：US17974068

申请日：2022-10-26

Applicant: Tencent America LLC

Inventor： Xin ZHAO ,  Xiaozhong XU ,  Shan LIU

IPC: H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/46

Abstract: This disclosure relates generally to video coding and particularly to intra block copy coding mode using wedgelet partitioning. For example, a method is disclosed for processing video data which may include receiving a video bitstream comprising a current block of a video frame; extracting an IntraBC flag from the video bitstream indicating that the current block is predicted under an IntraBC mode; determining from the video bitstream that the current block is partitioned under a wedgelet partitioning mode, wherein the current block is partitioned into a plurality of partitions comprising a first partition and a second partition; identifying at least the first partition and the second partition of the current block; determining a first block vector for predicting the first partition and a second block vector for predicting the second partition, respectively; and decoding the current block based on at least the first block vector and second block vector.

公开(公告)号：US20230128313A1

公开(公告)日：2023-04-27

申请号：US17824248

申请日：2022-05-25

Applicant: TENCENT AMERICA LLC

Inventor： Liang ZHAO ,  Xin ZHAO ,  Shan LIU

IPC: H04N19/137 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/70

Abstract: This disclosure relates signaling of adaptive resolution for motion vector difference in video encoding and decoding. An example method is disclosed decoding one or more video blocks of a video stream. The method may include receiving the video stream; extracting an inter-prediction syntax element from the video stream to determine whether an ADAPTMV mode is signaled for one or more video blocks, the ADAPTMV mode being a single-reference inter-prediction mode with adaptive motion vector difference (MVD) pixel resolution; determining a current MVD pixel resolution associated with the one or more video blocks abased on whether the ADAPTMV mode is signaled in the inter-prediction syntax element; and extracting and decoding one or more MVD-related syntax elements associated with the one or more video blocks based on whether the ADAPTMV mode is signaled in the inter-prediction syntax element and the current MVD pixel resolution.

公开(公告)号：US20230126552A1

公开(公告)日：2023-04-27

申请号：US17700887

申请日：2022-03-22

Applicant: Tencent America LLC

Inventor： Liang ZHAO ,  Xin ZHAO ,  Shan LIU

IPC: H04N19/137 ,  H04N19/70 ,  H04N19/176

Abstract: This disclosure relates encoding and decoding of motion vector difference in for inter-predicting a video block. An example is disclosed for decoding an inter-predicted video block of a video stream. The method includes deriving an inter-prediction mode for the video block from the video stream; deriving a motion vector prediction mode for the video block; deriving, from the video stream, a context for signaling a set of syntax elements associated with a Motion Vector Difference (MVD) associated with the video block based on the inter-prediction mode and/or the motion vector prediction mode; and decoding the video block based on the set of syntax elements and the derived context.

公开(公告)号：US20230068825A1

公开(公告)日：2023-03-02

申请号：US17975850

申请日：2022-10-28

Applicant: TENCENT AMERICA LLC

Inventor： Xin ZHAO ,  Xiang Li ,  Shan Liu

IPC: H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/13 ,  H04N19/46

Abstract: A method of controlling intra-inter prediction for decoding or encoding of a video sequence, is performed by at least one processor. The method includes determining whether one or more neighboring blocks in a video sequence is coded by an intra prediction mode, coding a prediction mode flag of a current block by a first context based on determining that at least one of the neighboring blocks is coded by the intra prediction mode, and coding the prediction mode flag of the current block by a second context based on determining that none of the neighboring blocks are coded by at least the intra prediction mode.

公开(公告)号：US20230061216A1

公开(公告)日：2023-03-02

申请号：US17893877

申请日：2022-08-23

Applicant: Tencent America LLC

Inventor： Xin ZHAO ,  Xiaozhong XU ,  Shan LIU

IPC: H04N19/105 ,  H04N19/463 ,  H04N19/423 ,  H04N19/176 ,  H04N19/172 ,  H04N19/593 ,  H04N19/159 ,  H04N19/132 ,  H04N19/136

Abstract: Aspects of the disclosure provide a method, an apparatus, and non-transitory computer-readable storage medium for video decoding. The apparatus includes processing circuitry configured to reconstruct an area in a block in a current picture from a coded video bitstream. The block includes one or more coding blocks (CBs) in the current picture. After the reconstructing, the processing circuitry determines whether to update a previous local reference range for an intra block copy (IBC) mode based on a content of the reconstructed area and/or prediction information of the reconstructed area. In response to a determination not to update the previous local reference range for the IBC mode, the previous local reference range for the IBC mode is not updated. The processing circuitry decodes a coding block in the current picture using the IBC mode that is based on the previous local reference range, which does not include the reconstructed area.

公开(公告)号：US20230060151A1

公开(公告)日：2023-03-02

申请号：US17978125

申请日：2022-10-31

Applicant: Tencent America LLC

Inventor： Xin ZHAO ,  Liang ZHAO ,  Shan LIU ,  Xiang LI

IPC: H04N19/11 ,  H04N19/70 ,  H04N19/176

Abstract: A method for video encoding includes determining an intra prediction angle for encoding a current block in a coded video sequence, the intra prediction angle being (i) beyond a bottom left direction diagonal mode, or (ii) beyond a top right direction diagonal mode. The method further includes determining an intra prediction mode corresponding to the intra prediction angle used to encode the current block based on a predetermined relationship between a plurality of intra prediction modes and a corresponding plurality of intra prediction angles, and generating prediction information indicating the determined intra prediction mode corresponding to the intra prediction angle used to encode the current block.

公开(公告)号：US20230012475A1

公开(公告)日：2023-01-19

申请号：US17940936

申请日：2022-09-08

Applicant: Tencent America LLC

Inventor： Xin ZHAO ,  Liang ZHAO ,  Shan LIU ,  Xiang LI

IPC: H04N19/11 ,  H04N19/176 ,  H04N19/70

Abstract: A method for video decoding is provided. The method includes determining an intra prediction angle that corresponds to an intra prediction mode of a plurality of intra prediction modes, a subset of the plurality of intra prediction modes being mapped to a plurality of wide-angle intra prediction modes based on a ratio of a width of a block and a height of the block not being equal to 1, a number of the subset of the intra prediction modes mapped to the plurality wide-angle intra prediction modes being based on the ratio of the width of the block and the height of the block. At least one sample of the block is reconstructed based on the intra prediction angle that is determined to correspond to the intra prediction mode.

公开(公告)号：US20230007251A1

公开(公告)日：2023-01-05

申请号：US17941952

申请日：2022-09-09

Applicant: TENCENT AMERICA LLC

Inventor： Xin ZHAO ,  Liang ZHAO ,  Shan LIU

IPC: H04N19/119 ,  H04N19/105 ,  H04N19/176 ,  H04N19/159 ,  H04N19/132

Abstract: There is includes a method and apparatus comprising computer code configured to cause a hardware processor or processors to perform obtaining a block of video data, splitting the block into an L-shaped partition and a second partition, the second partition being one of a rectangular shaped partition and another L-shaped partition, and performing intra prediction of the L-shaped partition by using a reference sample chain, comprising a chain of neighboring reconstructed samples, as reference samples.

公开(公告)号：US20220417497A1

公开(公告)日：2022-12-29

申请号：US17570603

申请日：2022-01-07

Applicant: Tencent America LLC

Inventor： Liang ZHAO ,  Xin ZHAO ,  Shan LIU

IPC: H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176

Abstract: Methods, apparatus, and computer readable storage medium for intra bi-prediction and multiple reference line intra prediction in video decoding. The method includes receiving, by a device, a coded video bitstream for a block. The method also includes determining, by the device, whether a single directional intra prediction or an intra bi-prediction applies to the block, based on mode information of the block, the mode information of the block comprising at least one of: a reference line index of the block, an intra prediction mode of the block, and a size of the block; in response to determining that the single directional intra prediction applies to the block, performing, by the device, the single directional intra prediction to the block; and in response to determining that the intra bi-prediction applies to the block, performing, by the device, the intra bi-prediction to the block.

公开(公告)号：US20220377386A1

公开(公告)日：2022-11-24

申请号：US17879371

申请日：2022-08-02

Applicant: Tencent America LLC

Inventor： Xiang LI ,  Xin ZHAO ,  Yixin DU ,  Liang ZHAO ,  Shan LIU

IPC: H04N19/82 ,  H04N19/176 ,  H04N19/117 ,  H04N19/46 ,  H04N19/132 ,  H04N19/186

Abstract: A method for video encoding includes determining a filter shape of a cross-component filter applied to a chroma coding block (CB), generating a first intermediate CB by applying a loop filter to the chroma CB, and generating a second intermediate CB by applying, to a corresponding luma CB, the cross-component filter applied to the chroma CB and having the determined filter shape. The method further includes determining a filtered chroma CB based on the first intermediate CB and the second intermediate CB by combining the loop filtered chroma CB with the cross-component filtered luma CB, and generating coded information of the chroma CB in a coded video bitstream. Determining the filter shape includes determining the filter shape of the cross-component filter based on the number of the filter coefficients and based on at least one of (i) the chroma subsampling format or (ii) the chroma sample type.