公开(公告)号：US20250106398A1

公开(公告)日：2025-03-27

申请号：US18974661

申请日：2024-12-09

Applicant: Tencent America LLC

Inventor： Xin ZHAO ,  Xiang LI ,  Shan LIU

IPC: H04N19/122 ,  H04N19/169 ,  H04N19/18 ,  H04N19/44 ,  H04N19/70

Abstract: In a method for video decoding in a video decoder, a maximum transform size associated with a video sequence is determined. The maximum transform size is indicated by a syntax element associated with the video sequence. Whether a coding unit (CU) size of a CU of the video sequence is larger than the maximum transform size is determined. When the CU size is less than the maximum transform size, a sub-block transform (SBT) mode is enabled. When the CU size is larger than the maximum transform size, the CU is split into a plurality of first transform units (TUs) and when intra sub partition (ISP) mode is enabled, one of the plurality of first TUs is split into a plurality of second TUs. The CU is reconstructed based on whether the CU size is larger than the maximum transform size.

公开(公告)号：US20250097428A1

公开(公告)日：2025-03-20

申请号：US18963170

申请日：2024-11-27

Applicant: Tencent America LLC

Inventor： Lien-Fei CHEN ,  Xiang LI ,  Shan LIU

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

Abstract: Aspects of the disclosure provide a method and an apparatus for video decoding. The apparatus includes processing circuitry that determines motion information of a current block. The motion information indicates one or more reference blocks of the current block. If a motion information constraint indicates that the one or more reference blocks are within picture boundaries of respective one or more reference pictures, the processing circuitry reconstructs the current block based on the one or more reference blocks. If a first motion vector (MV) points from a region in the current block to a first reference region of a first reference block that is outside a picture boundary of a first reference picture, the processing circuitry determines a first clipped MV pointing from the region to an updated first reference region by clipping the first MV where the updated first reference region is within the picture boundary.

公开(公告)号：US20250097427A1

公开(公告)日：2025-03-20

申请号：US18958988

申请日：2024-11-25

Applicant: Tencent America LLC

Inventor： Xin ZHAO ,  Xiaozhong XU ,  Xiang LI ,  Shan LIU

IPC: H04N19/137 ,  H04N19/119 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186 ,  H04N19/80 ,  H04N19/96

Abstract: A method and apparatus for encoding or decoding a video sequence includes encoding or decoding the video sequence using a 4:4:4 chroma format, or encoding or decoding the video sequence using a 4:2:2 chroma format, wherein when encoding or decoding the video sequence using the 4:4:4 chroma format, copying an affine motion vector of one 4×4 luma block using an operation other than an averaging operation and associating the affine motion vector to a co-located 4×4 chroma block, and when encoding or decoding the video sequence using the 4:2:2 chroma format, associating each 4×4 chroma block with two 4×4 co-located luma blocks such that an affine motion vector of one 4×4 chroma block is an average of the motion vectors of the two co-located luma blocks.

公开(公告)号：US20250056013A1

公开(公告)日：2025-02-13

申请号：US18932031

申请日：2024-10-30

Applicant: TENCENT AMERICA LLC

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

IPC: H04N19/159 ,  H04N19/105 ,  H04N19/11 ,  H04N19/176

Abstract: A method of signaling an intra prediction mode used to encode a current block in an encoded video bitstream using at least one processor includes generating a first most probable mode (MPM) list corresponding to a zero reference line of the current block, wherein the first MPM list includes a plurality of angular intra prediction modes; generating a second MPM list corresponding to one or more non-zero reference lines of the current block, wherein the second MPM list includes the plurality of angular intra prediction modes; signaling a reference line index indicating a reference line used to encode the current block from among the zero reference line and the one or more non-zero reference lines; and signaling an intra mode index indicating the intra prediction mode within the first MPM list or the second MPM list.

公开(公告)号：US20250055986A1

公开(公告)日：2025-02-13

申请号：US18933701

申请日：2024-10-31

Applicant: Tencent America LLC

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

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

Abstract: In a method for video decoding in a video decoder, at least one syntax element is decoded from a coded video sequence. The at least one syntax element is indicative of an intra prediction mode. An intra prediction angle that corresponds to the intra prediction mode is determined based on a predetermined relationship between a plurality of intra prediction modes and a plurality of intra prediction angles. At least one sample of a block is reconstructed using the intra prediction angle that is determined to correspond to the intra prediction mode. The plurality of intra prediction modes in the predetermined relationship includes at least one of a first plurality of wide angle prediction modes beyond a bottom left direction diagonal mode and a second plurality of wide angle prediction modes beyond a top right direction diagonal mode. The block is a non-square block.

公开(公告)号：US20250016327A1

公开(公告)日：2025-01-09

申请号：US18889860

申请日：2024-09-19

Applicant: Tencent America LLC

Inventor： Xiaozhong XU ,  Xiang LI ,  Shan LIU

IPC: H04N19/139 ,  H04N19/105 ,  H04N19/176 ,  H04N19/43 ,  H04N19/436 ,  H04N19/58

Abstract: In a method of video decoding performed by a decoder, a current picture is obtained from a coded video bitstream. The current picture is divided into a plurality of units and divided into a plurality of tiles. Each tile includes at least one unit of the plurality of units. A first current unit in a first tile of the plurality of tiles is decoded. A first HMVP buffer is updated with a motion vector of the first current unit that has been decoded. A position of the first current unit in the first tile of the plurality of tiles is determined. The first HMVP buffer is reset when the first current unit is located in a first column of the first tile.

公开(公告)号：US20240397075A1

公开(公告)日：2024-11-28

申请号：US18792160

申请日：2024-08-01

Applicant: TENCENT AMERICA LLC.

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

IPC: H04N19/44 ,  H04N19/105 ,  H04N19/11 ,  H04N19/119 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186 ,  H04N19/46

Abstract: Prediction information for a current block in a current picture is decoded, the prediction information indicating whether the current block is coded in matrix based intra prediction (MIP). When the current block is coded in the MIP, an MIP mode index indicating one of a plurality of MIP modes is determined. When the current block is not coded in the MIP and one of a plurality of neighboring blocks is coded in the MIP, an intra prediction candidate mode for the current block is determined to be a Planar intra prediction mode. The current block is reconstructed according to (i) the one of the plurality of MIP modes when the current block is coded in the MIP and (ii) the Planar intra prediction mode when the current block is not coded in the MIP and the one of the plurality of neighboring blocks is coded in the MIP.

公开(公告)号：US20240298026A1

公开(公告)日：2024-09-05

申请号：US18648079

申请日：2024-04-26

Applicant: TENCENT AMERICA LLC

Inventor： Xiaozhong XU ,  Xiang LI ,  Shan LIU

IPC: H04N19/593 ,  H04N19/105 ,  H04N19/176 ,  H04N19/186 ,  H04N19/423

CPC classification number: H04N19/593 ,  H04N19/105 ,  H04N19/176 ,  H04N19/186 ,  H04N19/423

Abstract: In a method for video decoding in a decoder, reconstructed samples of a reconstructed block of a picture are stored. When a current sub-block in a current block of the picture is to be reconstructed using intra block copy (IBC) based on a reference sub-block in the reconstructed block, the reference sub-block for the current sub-block is identified, whether the reconstructed samples of the reference sub-block stored are indicated as overwritten is determined based on a position of the current sub-block, reconstructed samples of the current sub-block for output are generated based on the reconstructed samples of the reference sub-block when the reconstructed samples of the reference sub-block stored are determined to be indicated as not overwritten, and the reconstructed samples of a collocated sub-block in the reconstructed block stored are overwritten with the generated reconstructed samples of the current sub-block.

公开(公告)号：US20240276000A1

公开(公告)日：2024-08-15

申请号：US18632251

申请日：2024-04-10

Applicant: TENCENT AMERICA LLC

Inventor： Guichun LI ,  Xiaozhong XU ,  Xiang LI ,  Shan LIU

IPC: H04N19/44 ,  H04N19/105 ,  H04N19/132 ,  H04N19/139 ,  H04N19/176 ,  H04N19/33

CPC classification number: H04N19/44 ,  H04N19/105 ,  H04N19/132 ,  H04N19/139 ,  H04N19/176 ,  H04N19/33

Abstract: A method for video encoding includes determining a corresponding motion vector for each of multiple control points of a base predictor. The method further includes determining a corresponding motion vector difference for each of the multiple control points of the base predictor based on the determined motion vector for each respective control point. The method further includes generating prediction information of the current block to be included in a coded video bitstream. The prediction information includes (i) a usage flag indicative of the affine merge mode with offset, (ii) offset parameters defining the determined corresponding motion vector difference for each of the one or more of the control points, and (iii) a zero motion vector difference flag for the multiple control points of the base predictor. The zero motion vector difference flag indicates whether offset parameters for the respective control point are provided in the prediction information.

公开(公告)号：US20240275977A1

公开(公告)日：2024-08-15

申请号：US18645231

申请日：2024-04-24

Applicant: TENCENT AMERICA LLC

Inventor： Ling LI ,  Xiang LI ,  Shan LIU

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

CPC classification number: H04N19/132 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176

Abstract: One or more intra mode predictors of a current block are determined, where the one or more intra mode predictors are derived based on the neighboring samples of the current block via either a decoder side intra mode derivation (DIMD) or a template-based intra mode derivation (TIMD). Whether a position dependent intra prediction combination (PDPC) is to be applied is determined based on the one or more intra mode predictors. In response to the determining that the PDPC is to be applied, a fusion process is performed on the one or more intra mode predictors to combine the one or more intra mode predictors into a single intra mode predictor. The PDPC is applied based on the single intra mode predictor to generate a modified predictor of the current block. The current block is reconstructed based on the modified predictor generated by the PDPC.