公开(公告)号：US20240048730A1

公开(公告)日：2024-02-08

申请号：US17981842

申请日：2022-11-07

Applicant: Tencent America LLC

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

IPC: H04N19/176 ,  H04N19/102 ,  H04N19/51

CPC classification number: H04N19/176 ,  H04N19/102 ,  H04N19/51

Abstract: Systems and methods for encoding and decoding using warp motion modes are provided. A method includes receiving a bitstream that includes a coded picture; obtaining warp information that is signaled in the bitstream, the warp information including a warp type indicating a number of parameters to be corrected by delta values, the number of parameters defining warp motion for predicting a current block of the coded picture; obtaining at least one delta value from the bitstream that is a delta of at least one parameter that defines the warp motion for predicting the current block; obtaining a warp model based on the warp information and the at least one delta value; and predicting the current block by performing warped motion compensation using the warp model.

公开(公告)号：US20240015303A1

公开(公告)日：2024-01-11

申请号：US17983975

申请日：2022-11-09

Applicant: TENCENT AMERICA LLC

Inventor： Han GAO ,  Xin ZHAO ,  Liang ZHAO ,  Madhu PERINGASSERY KRISHNAN ,  Shan LIU

IPC: H04N19/159 ,  H04N19/176 ,  H04N19/172 ,  H04N19/105 ,  H04N19/139 ,  H04N19/85 ,  H04N19/52 ,  H04N19/573 ,  H04N19/46

CPC classification number: H04N19/159 ,  H04N19/176 ,  H04N19/172 ,  H04N19/105 ,  H04N19/139 ,  H04N19/85 ,  H04N19/52 ,  H04N19/573 ,  H04N19/46

Abstract: An approach for encoding/decoding video data, performed by at least one processor, including: obtaining video data; parsing the video data into blocks, wherein the blocks are associated with reference picture lists; generating a warp model used for a first reference picture list and a second reference picture list of a current block, included in the reference picture lists, based on motion vectors of the current block and adjacent blocks to the current block; decoding a frame among the first reference picture list and the second reference picture list by applying the warp model to the frame.

公开(公告)号：US20230396797A1

公开(公告)日：2023-12-07

申请号：US17982063

申请日：2022-11-07

Applicant: Tencent America LLC

Inventor： Guichun LI ,  Han GAO ,  Xin ZHAO ,  Lien-Fei CHEN ,  Shan LIU

IPC: H04N19/573 ,  H04N19/46 ,  H04N19/105 ,  H04N19/172 ,  H04N19/139 ,  H04N19/157 ,  H04N19/176 ,  H04N19/44 ,  H04N19/52

CPC classification number: H04N19/573 ,  H04N19/46 ,  H04N19/105 ,  H04N19/172 ,  H04N19/139 ,  H04N19/157 ,  H04N19/176 ,  H04N19/44 ,  H04N19/52

Abstract: Processing circuitry receives, from a coded video bitstream, a first flag for a current block of an affine mode in a current picture, the first flag is associated with a first reference picture. The first flag indicates whether one or more motion vector differences of a reduced counting number are signaled. The reduced counting number is smaller than a number of first control points in a first affine model associated with the first reference picture. The processing circuitry decodes the one or more motion vector differences of the reduced counting number from the coded video bitstream in response to the first flag indicating the reduced counting number. The processing circuitry determines first control point motion vectors for the first control points in the first affine model according to the one or more motion vector differences of the reduced counting number, and reconstructs the current block accordingly.

公开(公告)号：US20230388529A1

公开(公告)日：2023-11-30

申请号：US17982071

申请日：2022-11-07

Applicant: TENCENT AMERICA LLC

Inventor： Han GAO ,  Xin Zhao ,  Liang Zhao ,  Shan Liu

IPC: H04N19/44 ,  H04N19/513 ,  H04N19/137 ,  H04N19/176 ,  H04N19/70

CPC classification number: H04N19/44 ,  H04N19/513 ,  H04N19/137 ,  H04N19/176 ,  H04N19/70

Abstract: A video decoder is provided for the decoding of a video bitstream encoded in a temporal interpolated prediction (TIP) mode. First and second motion vectors pointing to respective reference frames, or reference pictures within those frames, are generated for a block of a current picture. The motion vectors are then refined by application of a decoder-side motion vector refinement (DMVR) process, based on a bilateral matching process, and the refined motion vectors are used to decode the block. The refinement may more specifically involve consideration of candidates for the refined motion vectors, selected by the bilateral matching. The refinement may be applied at both block and sub-block divisions of the current picture.

公开(公告)号：US20250097408A1

公开(公告)日：2025-03-20

申请号：US18970698

申请日：2024-12-05

Applicant: Tencent America LLC

Inventor： Liang ZHAO ,  Xin ZHAO ,  Han GAO ,  Biao WANG ,  Xiaozhong XU ,  Shan LIU

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

Abstract: The various implementations described herein include methods and systems for coding video. In one aspect, a method includes receiving a video bitstream including a current coding block of a current image frame and determining that the current coding block is to be predicted in a weighted bi-prediction (WBP) mode. The method further includes in response to the current coding block being predicted in the WBP mode, determining that the current coding block is associated with two bi-prediction blocks and identifying a plurality of distinct weighting factor lists including at least a first list of positive weighting factors and a second list of mixed weighting factors. The method further includes selecting one of the weighing factor lists, identifying a first weighting factor from the weighing factor lists, and reconstructing the current image frame, including determining the current coding block by combining the two bi-prediction blocks based on the first weighting factor.

公开(公告)号：US20250024055A1

公开(公告)日：2025-01-16

申请号：US18241765

申请日：2023-09-01

Applicant: Tencent America LLC

Inventor： Han GAO ,  Liang Zhao ,  Xin Zhao ,  Jing Ye ,  Shan Liu

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

Abstract: The various implementations described herein include methods and systems for encoding and decoding video. For example, a computing system receives a video bitstream that includes a current block and a syntax element. The current block is encoded using information from a set of reference blocks. The system determines, based on the syntax element, whether the current block is encoded in a compound weighted prediction (CWP) mode. The system decodes the current block using a set of weighted prediction factors when the current block is encoded in the CWP mode. When the current block is not encoded in the CWP mode, the system decodes the current block using an implicit masked blending mode based on a weighted average of reference values associated with the set of reference blocks.

公开(公告)号：US20240430448A1

公开(公告)日：2024-12-26

申请号：US18241759

申请日：2023-09-01

Applicant: Tencent America LLC

Inventor： Han GAO ,  Xin Zhao ,  Liang Zhao ,  Shan Liu ,  Jing Ye

IPC: H04N19/167 ,  H04N19/105 ,  H04N19/132 ,  H04N19/139 ,  H04N19/176 ,  H04N19/186 ,  H04N19/70

Abstract: A computing system receives a video bitstream comprising a current picture and a current block within the current picture. The current block is encoded using information from a first reference block and a second reference block. When a portion of the current block corresponds to a first area that is within reference boundaries in both of the first and second reference blocks, the system reconstructs the portion using an average of reference values from the first and second reference blocks. When the portion of the current block corresponds to (i) a second area that is not within the reference boundaries in both of the first and second reference blocks or (ii) a third area that is within the reference boundaries in only one of the first and second reference blocks, the system reconstructs the portion using a weighted average of respective values of the first and second reference blocks.

公开(公告)号：US20240430410A1

公开(公告)日：2024-12-26

申请号：US18828655

申请日：2024-09-09

Applicant: TENCENT AMERICA LLC

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

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

Abstract: This disclosure relates generally to video coding and particularly to methods and systems for determination of temporal motion vector predictor (TMVP) candidates for inter-prediction in video coding. The disclosed methods, for example, include restricting the number of TMVP candidates in a motion vector predictor (MVP) list and provide various search mechanism in order to promote MVP candidate diversity among TMVP and other types of MVP candidates and to improve coding efficiency.

公开(公告)号：US20240388714A1

公开(公告)日：2024-11-21

申请号：US18474532

申请日：2023-09-26

Applicant: Tencent America LLC

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

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

Abstract: The various implementations described herein include methods and systems for encoding and decoding video. In one aspect, a method of video decoding includes receiving video data that includes a first block from a video bitstream, where the first block is predicted in an angular prediction mode. The method also includes identifying a set of reference samples for a portion of the first block using a prediction angle for the angular prediction mode and deriving a first angular prediction value for the portion using at least a first subset of the set of reference samples. The method further includes deriving a second angular prediction value for the portion using a weighted sum of at least a second subset of the set of reference samples and the first angular prediction value and decoding the portion using the second angular prediction value.

公开(公告)号：US20240380909A1

公开(公告)日：2024-11-14

申请号：US18464578

申请日：2023-09-11

Applicant: Tencent America LLC

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

IPC: H04N19/44 ,  H04N19/176 ,  H04N19/30 ,  H04N19/46 ,  H04N19/70

Abstract: This disclosure relates generally to video coding/decoding and particularly for providing extension to block adaptive weighted prediction (BAWP). One method includes receiving a coded video bitstream; determining, based on a syntax element signaled in the coded video bitstream, a prediction mode for predicting the current block based on a reference block, wherein the prediction mode comprises a linear equation; deriving a scaling factor for the current block, from at least one of the following: multiple scaling factors of neighboring blocks with respect to the current block, or a stored scaling factor bank; and reconstructing the current block based on the reference block and the identified scaling factor according to the linear equation.