公开(公告)号：US20200228817A1

公开(公告)日：2020-07-16

申请号：US16738728

申请日：2020-01-09

申请人： Tencent America LLC

发明人： Guichun LI ,  Xiang LI ,  Xiaozhong XU ,  Shan LIU

IPC分类号： H04N19/44 ,  H04N19/149 ,  H04N19/132 ,  H04N19/137 ,  H04N19/159 ,  H04N19/176

摘要： Aspects of the disclosure provide methods and apparatuses for video encoding/decoding. In some examples, an apparatus for video decoding includes receiving circuitry and processing circuitry. The processing circuitry decodes prediction information of a current block in a current picture from a coded video bitstream. The prediction information is indicative of an affine based motion vector prediction. The processing circuitry determines a first affine model for the current block. The first affine model has first affine parameters. Then, the processing circuitry determines a second affine model for a first clipping region in the current block. The second affine model has second affine parameters with differences to the first affine parameters being smaller than a threshold. Motion vectors determined based on the second affine model satisfy a clipping requirement. The processing circuitry reconstructs a sample in the first clipping region based on the second affine model.

公开(公告)号：US20200177873A1

公开(公告)日：2020-06-04

申请号：US16531958

申请日：2019-08-05

申请人： Tencent America LLC

发明人： Xiang LI ,  Guichun LI ,  Xiaozhong XU ,  Shan LIU

IPC分类号： H04N19/103 ,  H04N19/593 ,  H04N19/70 ,  H04N19/176 ,  H04N19/119 ,  H04N19/137

摘要： Aspects of the disclosure provide methods and apparatuses for video coding. In some examples, an apparatus includes processing circuitry that obtains a first syntax element from a coded video bitstream, the first syntax element being associated with a plurality of modes for identifying and applying motion information to a current block, and a first value of the first syntax element indicating a subset of the plurality of modes for the current block. The processing circuitry further generates a predictor of the current block according to the subset of the plurality of modes indicated by the first value of the first syntax element, and generates reconstructed samples of the current block based on the predictor.

公开(公告)号：US20200169729A1

公开(公告)日：2020-05-28

申请号：US16688408

申请日：2019-11-19

申请人： TENCENT AMERICA LLC

发明人： Xiaozhong XU ,  Shan LIU ,  Yiming LI ,  Zhenzhong CHEN

IPC分类号： H04N19/11 ,  H04N19/139 ,  H04N19/177 ,  H04N19/513 ,  H04N19/52

摘要： A method of controlling intra prediction for decoding or encoding of a video sequence, is performed by at least one processor and includes obtaining intra prediction modes including directional modes respectively corresponding to angular prediction directions, a first amount of one or more of the directional modes being excluded from the intra prediction modes based on a second amount of the intra prediction modes and a third amount of most probable modes (MPMs). The method further includes selecting, as the MPMs, two or more of the intra prediction modes from which the one or more of the directional modes are excluded, and selecting, for decoding the video sequence, one of the intra prediction modes from which the one or more of the directional modes are excluded.

公开(公告)号：US20200154126A1

公开(公告)日：2020-05-14

申请号：US16449277

申请日：2019-06-21

申请人： Tencent America LLC

发明人： Guichun LI ,  Xiang LI ,  Xiaozhong XU ,  Shan LIU

IPC分类号： H04N19/513 ,  H04N19/176 ,  H04N19/61 ,  H04N19/186

摘要： In a method for video coding, prediction information of a current block in a current picture is decoded from a coded video bitstream. The prediction information is indicative of an affine model, and the current block includes two or more control points. A motion vector for each of the two or more control points is determined based on a corresponding motion vector predictor for the respective control point. The corresponding motion vector predictor for the respective control point is a first predictor of a plurality of candidate motion vector predictors in a candidate list and meets a constraint that is associated with a motion vector of the corresponding motion vector predictor. Further, parameters of the affine model are defined based on the determined motion vectors of the two or more control points, and at least a sample of the block is reconstructed according to the affine model.

公开(公告)号：US20200152240A1

公开(公告)日：2020-05-14

申请号：US16185264

申请日：2018-11-09

申请人： Tencent America LLC

发明人： Xiaozhong XU ,  Shan Liu ,  Xiang Li

IPC分类号： G11B27/34 ,  G06T13/80 ,  G11B20/00 ,  H04N9/87

摘要： Aspects of encoding and decoding video content are provided. An encoding system detects a scene change by identifying a first picture among a sequence of pictures that corresponds to a last picture of a first scene, identifying a second picture among the sequence of pictures that corresponds to a first picture of a second scene, and determining that one or more pictures that are between the first picture and the second picture in the sequence of pictures correspond to an input transition scene between the first scene and the second scene. The encoded video content indicates an existence of the input transition scene and information for reproducing a transition scene. A decoding system generates the transition scene that corresponds to the input transition scene based on the received indication of the existence of the input transition scene and the information for reproducing the transition scene.

公开(公告)号：US20200112739A1

公开(公告)日：2020-04-09

申请号：US16540582

申请日：2019-08-14

申请人： Tencent America LLC

发明人： Xiaozhong XU ,  Xiang LI ,  Shan LIU

IPC分类号： H04N19/513 ,  H04N19/44 ,  H04N19/593 ,  H04N19/176 ,  H04N19/70

摘要： An apparatus for video decoding includes processing circuitry that decodes prediction information for a current block in a current coded picture. The prediction information indicates a prediction mode that uses a motion vector predictor candidate list for reconstructing the current block. The processing circuitry includes a new motion vector predictor into the motion vector predictor candidate list. The new motion vector predictor is one of a first motion vector predictor and a second motion vector predictor. The first motion vector predictor is a first average result of a pair of existing motion vector predictors in the motion vector predictor candidate list and a temporal motion vector predictor (TMVP). The second motion vector predictor is a second average result of a pair of history-based motion vector predictors (HMVPs) in an HMVP buffer. The processing circuitry reconstructs the current block based on the motion vector predictor candidate list.

公开(公告)号：US20200099941A1

公开(公告)日：2020-03-26

申请号：US16525533

申请日：2019-07-29

申请人： Tencent America LLC

发明人： Xiang LI ,  Xin ZHAO ,  Xiaozhong XU ,  Shan LIU ,  Meng XU

IPC分类号： H04N19/186 ,  H04N19/503 ,  H04N19/176

摘要： Aspects of the disclosure provide methods and apparatuses for video encoding/decoding. In some examples, an apparatus for video decoding includes processing circuitry that decodes prediction information for a plurality of first blocks in a current coded picture that is a part of a coded video sequence. The prediction information indicates that the plurality of first blocks is coded in a local illumination compensation (LIC) mode. The processing circuitry selects a neighboring region for each of the plurality of first blocks. The selected neighboring region and the respective first block form a second block. The processing circuitry performs an inter prediction for the plurality of second blocks in parallel. The processing circuitry determines a set of LIC parameters for each of the plurality of first blocks based on the selected neighboring region of the respective first block and reconstructs the plurality of first blocks based on the sets of LIC parameters.

公开(公告)号：US20200045328A1

公开(公告)日：2020-02-06

申请号：US16440315

申请日：2019-06-13

申请人： Tencent America LLC

发明人： Jing YE ,  Shan LIU ,  Xiang LI ,  Guichun LI ,  Xiaozhong XU

IPC分类号： H04N19/513 ,  H04N19/44

摘要： An apparatus for video decoding includes receiving circuitry and processing circuitry. The processing circuitry decodes prediction information for a current block in a current picture from a coded video bitstream, the prediction information being indicative of a prediction mode that is based on an expanded motion vector candidate list. The processing circuitry expands the current block to generate an expanded block by iteratively (i) increasing a width of the current block by a first grid size and (ii) increasing a height of the current block by a second grid size until a number of iterations is equal to a value indicative of a maximum search round. The processing circuitry searches and locates, in the expanded block, a plurality of blocks and constructs, in response to the prediction mode, the expanded motion vector candidate list.

公开(公告)号：US20200029089A1

公开(公告)日：2020-01-23

申请号：US16440686

申请日：2019-06-13

申请人： Tencent America LLC

发明人： Xiaozhong XU ,  Guichun Li ,  Xiang Li ,  Shan Liu

IPC分类号： H04N19/513 ,  H04N19/176 ,  H04N19/61 ,  H04N19/96

摘要： Aspects of the disclosure provide methods and apparatuses for video encoding/decoding. In some examples, an apparatus for video decoding includes receiving circuitry and processing circuitry. For example, the processing circuitry decodes prediction information of a current block in a current picture from a coded video bitstream. The prediction information is indicative of an affine based motion vector prediction. Further, the processing circuitry identifies consecutive minimum compensation blocks that are adjacent of the current block and affine coded. Then, the processing circuitry determines, based on motion information of at least two minimum compensation blocks in the consecutive minimum compensation blocks, parameters of an affine model, and reconstruct at least a sample of the current block based on the affine model that is used to transform between the current block and a reference block in a reference picture that has been reconstructed.

公开(公告)号：US20190246113A1

公开(公告)日：2019-08-08

申请号：US16182782

申请日：2018-11-07

申请人： Tencent America LLC

发明人： Xiaozhong XU ,  Xiang LI ,  Shan LIU

IPC分类号： H04N19/156 ,  H04N19/115 ,  H04N19/176 ,  H04N19/44

摘要： Aspects of the disclosure provide method and apparatus for video coding. In some examples, an apparatus includes processing circuitry for video decoding. The processing circuitry calculates, cost function values associated with refinements of a block vector predictor for a current block in a picture. Then, the processing circuitry determines a refined block vector predictor that has a smallest cost function value among the cost function values, and reconstructs at least one sample of the current block based on the refined block vector predictor.