公开(公告)号：US20240323386A1

公开(公告)日：2024-09-26

申请号：US18680979

申请日：2024-05-31

Applicant: Tencent America LLC

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

IPC: H04N19/132 ,  H04N19/105 ,  H04N19/137 ,  H04N19/159 ,  H04N19/176

CPC classification number: H04N19/132 ,  H04N19/105 ,  H04N19/137 ,  H04N19/159 ,  H04N19/176

Abstract: An apparatus includes processing circuitry that is configured to determine whether at least one sample of a plurality of samples in a first template of a current block is in an intra coded block that is a spatial neighboring block of the current block, the first template including one or more samples of (1) top neighboring blocks and (2) left neighboring blocks of the current block. The processing circuitry is configured to, when (i) the at least one sample is included in the intra coded block and (ii) a template matching mode is applied to the current block, exclude the at least one sample from the first template to generate a second template for the current block. The processing circuitry is configured to determine a motion vector of the current block based on the second template. The processing circuitry is configured to reconstruct the current block based on the MV.

公开(公告)号：US20240314348A1

公开(公告)日：2024-09-19

申请号：US18497748

申请日：2023-10-30

Applicant: TENCENT AMERICA LLC

Inventor： Liang ZHAO ,  Xin ZHAO ,  Shan LIU

IPC: H04N19/517 ,  H04N19/105 ,  H04N19/137 ,  H04N19/176

CPC classification number: H04N19/517 ,  H04N19/105 ,  H04N19/137 ,  H04N19/176

Abstract: This disclosure relates generally to video coding and particularly to methods and systems for boundary padding for motion compensation. For example, a motion vector for a motion compensation padded block in a motion compensation padding area of a picture in a video may be determined from scanning a set of neighboring boundary blocks of the picture and/or a set of co-located temporal blocks of the boundary blocks. The motion compensation padded block may be padded according to the motion vector and used for motion compensation of other pictures in the video.

公开(公告)号：US20240314320A1

公开(公告)日：2024-09-19

申请号：US18668876

申请日：2024-05-20

Applicant: TENCENT AMERICA LLC

Inventor： Madhu PERINGASSERY KRISHNAN ,  Xin ZHAO ,  Shan LIU

IPC: H04N19/13 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  H04N19/91

CPC classification number: H04N19/13 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  H04N19/91

Abstract: This disclosure relates to secondary transform of video blocks with adaptive kernel options. For example, a method for decoding a video block in a video stream is disclosed. The method may include comprising parsing and processing the video stream to generate: a set of secondary transform coefficients associated with the video block; an intra prediction mode associated with the video block; and a kernel index indicating a secondary transform kernel among a group of secondary transform kernels. The method may further include identifying the group of secondary transform kernels based on the intra prediction mode; and performing an inverse secondary transform of the set of secondary transform coefficients to generate primary transform coefficients of the video block based on the secondary transform kernel among the group of secondary transform kernels identified by the kernel index. The quantity of kernels in the group of secondary transform kernels depends on at least one of: the intra prediction mode associated with the video block; a size of the video block; or a primary transform type associated with the video block.

公开(公告)号：US20240305809A1

公开(公告)日：2024-09-12

申请号：US18668535

申请日：2024-05-20

Applicant: TENCENT AMERICA LLC

Inventor： Byeongdoo CHOI ,  Stephan WENGER ,  Shan LIU

IPC: H04N19/46 ,  H04N19/169 ,  H04N19/174 ,  H04N19/82

CPC classification number: H04N19/46 ,  H04N19/174 ,  H04N19/188 ,  H04N19/82

Abstract: A method, computer program, and computer system is provided for coding video data. Video data including one or more subpictures is received. A network abstraction layer (NAL) unit type associated with each of the one or more subpictures is identified based on checking a flag corresponding to mixed NAL units in the one or more subpictures. The video data is decoded based on the identified NAL unit types.

公开(公告)号：US20240298022A1

公开(公告)日：2024-09-05

申请号：US18215321

申请日：2023-06-28

Applicant: Tencent America LLC

Inventor： Liang ZHAO ,  Xin ZHAO ,  Jing YE ,  Han GAO ,  Shan LIU

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

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

Abstract: Coded information of a current block and a plurality of reference lines of the current block is received. A first offset value is determined in a first mapping table and associated with a first reference line of the plurality of reference lines that is adjacent to the current block. A second offset value is determined in a second mapping table and associated with a second reference line of the plurality of reference lines that is adjacent to the first reference line. A first reference sample for a sample of the current block is determined from the first reference line based on the first offset value. A second reference sample for the sample of the current block is determined from the second reference line based on the second offset value. The sample of the current block is reconstructed based on one of the first reference sample and the second reference sample.

公开(公告)号：US20240291963A1

公开(公告)日：2024-08-29

申请号：US18587718

申请日：2024-02-26

Applicant: Tencent America LLC

Inventor： Lien-Fei CHEN ,  Han GAO ,  Xin ZHAO ,  Xiaozhong XU ,  Roman CHERNYAK ,  Shan LIU

IPC: H04N19/105 ,  H04N19/132 ,  H04N19/172 ,  H04N19/176 ,  H04N19/52 ,  H04N19/567

CPC classification number: H04N19/105 ,  H04N19/132 ,  H04N19/172 ,  H04N19/176 ,  H04N19/52 ,  H04N19/567

Abstract: A method of video decoding includes receiving a coded video bitstream comprising coded information of a current block in a current picture. The coded information is indicative of a bi-directional prediction with a refinement. The refinement determines an offset based on a plurality of calculations, and each calculation includes reference samples of a first reference picture and a second reference picture for the current picture. The method further includes determining that a first calculation in the plurality of calculations uses a first reference sample that is an out of boundary (OOB) prediction sample. An OOB prediction sample of a reference picture is out of a frame boundary of the reference picture. The method also includes performing the refinement that determines the offset based on the plurality of calculations with at least the first reference sample being excluded, and reconstructing the current block according to the bi-directional prediction with the offset.

公开(公告)号：US20240281904A1

公开(公告)日：2024-08-22

申请号：US18651337

申请日：2024-04-30

Applicant: Tencent America LLC

Inventor： Liang ZHAO ,  Xin ZHAO ,  Shan LIU

IPC: G06Q50/04 ,  G06Q10/0631

CPC classification number: G06Q50/04 ,  G06Q10/06313

Abstract: An example method of video decoding includes receiving a video bitstream that comprises a plurality of blocks including a current chroma block. When less than a threshold number of neighboring chroma blocks of a current chroma block use a chroma-from-luma (CfL) mode, a first context is selected as an entropy decoding context for a first flag. When at least the threshold number of neighboring chroma blocks use the CfL mode, a second context is selected as the entropy decoding context for the first flag. The method also includes entropy decoding the first flag from the video bitstream using the entropy decoding context, where the first flag indicates whether the CfL mode is enabled for the current chroma block, and decoding the current chroma block according to a value of the first flag.

公开(公告)号：US20240275959A1

公开(公告)日：2024-08-15

申请号：US18384759

申请日：2023-10-27

Applicant: Tencent America LLC

Inventor： Xin ZHAO ,  Liang ZHAO ,  Jing YE ,  Han GAO ,  Shan LIU

IPC: H04N19/117 ,  H04N19/11 ,  H04N19/136 ,  H04N19/159 ,  H04N19/176 ,  H04N19/593

CPC classification number: H04N19/117 ,  H04N19/11 ,  H04N19/136 ,  H04N19/159 ,  H04N19/176 ,  H04N19/593

Abstract: The disclosure includes methods and apparatuses that includes processing circuitry that receives, from a bitstream comprising a current block in a picture, coding information of the bitstream indicating that the current block is coded in an angular intra prediction mode with an intra interpolation filter. The processing circuitry applies each of a predefined set of intra interpolation filters to neighboring reconstructed samples within N adjacent lines from a boundary of the current block. The processing circuitry selects one intra interpolation filter from the predefined set of intra interpolation filters based a prediction error associated with the each of the predefined set of intra interpolation filters and predicts a sample in the current block using the angular intra prediction mode using the selected one intra interpolation filter. The processing circuitry reconstructs the current block based on the predicted sample.

公开(公告)号：US20240267545A1

公开(公告)日：2024-08-08

申请号：US18497902

申请日：2023-10-30

Applicant: Tencent America LLC

Inventor： Jing YE ,  Xin ZHAO ,  Liang ZHAO ,  Shan LIU

IPC: H04N19/44 ,  H04N19/105 ,  H04N19/132 ,  H04N19/176 ,  H04N19/186 ,  H04N19/70

CPC classification number: H04N19/44 ,  H04N19/105 ,  H04N19/176 ,  H04N19/186

Abstract: The various implementations described herein include methods and systems for coding video. In one aspect, a video bitstream includes a current coding block of an image frame and a syntax element for a cross-component intra prediction mode. A first chroma sample is generated by combining a first luma sample co-located with the first chroma sample and its associated neighboring luma samples using a plurality of weighing factors. The method includes extracting at least one of weighing factors from the video bitstream, and deriving the at least another weighing factor. The method further includes combining the first luma sample and the neighboring luma samples based on the at least one weighing factor that is signaled in the video bitstream and the at least another weighing factor that is not signaled in the video bitstream to generate the first chroma sample, which is applied to reconstruct the current coding block.

公开(公告)号：US20240267525A1

公开(公告)日：2024-08-08

申请号：US18455309

申请日：2023-08-24

Applicant: TENCENT AMERICA LLC

Inventor： Liang ZHAO ,  Xin ZHAO ,  Han GAO ,  Shan LIU

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

CPC classification number: H04N19/137 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/70

Abstract: This disclosure relates generally to video coding and particularly to smooth-sub-block motion compensation, disclosing methods and systems for determining subblock motion vectors of a video block based on motion information of its spatial neighboring block, temporal blocs spatially co-located with the neighboring blocks, or co-located temporal block of the video block.