公开(公告)号：US12301826B2

公开(公告)日：2025-05-13

申请号：US18735721

申请日：2024-06-06

Applicant: Tencent America LLC

Inventor： Lien-Fei Chen ,  Xiang Li ,  Shan Liu

IPC: H04N19/136 ,  H04N19/105 ,  H04N19/176 ,  H04N19/88

Abstract: Aspects of the disclosure provide methods and apparatuses for video coding. A method for video decoding includes receiving a coded video bitstream that includes prediction information of a current block in a current picture. The prediction information indicates that an adaptive motion vector prediction (AMVP) mode and an adaptive motion vector resolution (AMVR) mode are applied to the current block. A set of motion vector (MV) resolutions in the AMVR mode is available for the current block. The method includes determining respective template matching (TM) costs corresponding to each of a plurality of MV resolutions in the set of MV resolutions based on the plurality of MV resolutions and motion information of the current block, reordering the plurality of MV resolutions based on the determined TM costs, selecting an MV resolution from the reordered plurality of MV resolutions, and reconstructing the current block based on the selected MV resolution.

公开(公告)号：US12301787B2

公开(公告)日：2025-05-13

申请号：US18437193

申请日：2024-02-08

Applicant: TENCENT AMERICA LLC

Inventor： Liang Zhao ,  Xin Zhao ,  Xiang Li ,  Shan Liu

IPC: H04N19/159 ,  H04N19/103 ,  H04N19/117 ,  H04N19/176 ,  H04N19/189

Abstract: In a method for video decoding, a determination, for a current block that is a non-square block, is made as to whether an angular intra prediction mode for the current block is a wide angle mode that is in a direction outside of a range of directions that spans a bottom left diagonal direction and top right diagonal direction of the current block. When the angular intra prediction mode is the wide angle mode, whether a block size of the non-square block is greater than 32 is determined. When the block size of the non-square block is greater than 32, an intra smoothing filter is enabled and the enabled intra smoothing filter is applied to blocks neighboring the current block to generate filtered blocks. Intra prediction is performed based on the filtered blocks to obtain a characteristic value for the current block.

公开(公告)号：US12267512B2

公开(公告)日：2025-04-01

申请号：US17944999

申请日：2022-09-14

Applicant: Tencent America LLC

Inventor： Ling Li ,  Xiang Li ,  Shan Liu

IPC: H04N19/96 ,  H04N19/107 ,  H04N19/159 ,  H04N19/176 ,  H04N19/196

Abstract: Neighboring blocks of a current block include first blocks adjacent to one of a top side, an above left corner, and an above right corner of the current block and second blocks adjacent to one of a left side and a below left corner of the current block. Whether one or more of the first blocks and the current block are in a same coding tree unit (CTU) is determined. Based on the one or more of the first blocks and the current block being in the same CTU, a respective intra mode associated with each of the one or more of the first blocks is added into a most probable mode (MPM) list for the current block based on a sequence of conditions. A respective intra mode associated with each of the second blocks is added into the MPM list based on the sequence of conditions.

公开(公告)号：US12256067B2

公开(公告)日：2025-03-18

申请号：US18403658

申请日：2024-01-03

Applicant: TENCENT AMERICA LLC

Inventor： Liang Zhao ,  Xin Zhao ,  Xiang Li ,  Shan Liu

IPC: H04N19/11 ,  H04N19/174 ,  H04N19/176

Abstract: There is includes a method and apparatus comprising computer code configured to cause a hardware processor or processors to perform intra prediction among a plurality of reference lines, to set a plurality of intra prediction modes for a zero reference line nearest to a current block of the intra prediction among non-zero reference lines, and to set one or more most probable modes for one of the non-zero reference lines.

公开(公告)号：US12231651B2

公开(公告)日：2025-02-18

申请号：US18107941

申请日：2023-02-09

Applicant: TENCENT AMERICA LLC

Inventor： Xiaozhong Xu ,  Xiang Li ,  Shan Liu

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

Abstract: Aspects of the disclosure provide a method and an apparatus for video coding. In some examples, the apparatus includes processing circuitry for video encoding. The processing circuitry selects a resolution from a set of resolutions that includes a 1-integer-pel resolution and a 4-integer-pel resolution. A current block is encoded with an intra block copy mode based on the selected resolution. The processing circuitry determines a block vector of the current block. The processing circuitry determines a block vector difference of the current block based on the block vector and a block vector predictor of the current block. The block vector difference is in the selected resolution. The processing circuitry encodes prediction information indicating the selected resolution and the block vector difference.

公开(公告)号：US12212780B2

公开(公告)日：2025-01-28

申请号：US18478532

申请日：2023-09-29

Applicant: TENCENT AMERICA LLC

Inventor： Cheung Auyeung ,  Xin Zhao ,  Xiang Li ,  Shan Liu

IPC: H04N19/60 ,  H04N19/124 ,  H04N19/13 ,  H04N19/136 ,  H04N19/167 ,  H04N19/176 ,  H04N19/18 ,  H04N19/70 ,  H04N19/91

Abstract: In a method of processing visual media data, a conversion is performed between a visual media file and a bitstream of visual media data according to a format rule. The bitstream includes at least one syntax element that corresponds to transform coefficients of a transform block in a current picture. The format rule specifies that a context model index is based on a sum of an offset value and a base value. The offset value is based on an output of a monotonically non-decreasing function performed on a sum of a group of partially reconstructed transform coefficients. A context model, for the at least one syntax of a current transform coefficient, from a plurality of context models is indicated by the context model index.

公开(公告)号：US12184854B2

公开(公告)日：2024-12-31

申请号：US18184224

申请日：2023-03-15

Applicant: TENCENT AMERICA LLC

Inventor： Xin Zhao ,  Xiang Li ,  Shan Liu

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

Abstract: A method and apparatus for performing maximum transform size control for encoding of a video sequence includes identifying, by an encoder, a high-level syntax element associated with the video sequence. A maximum transform size associated with the video sequence is determined based on identifying the high-level syntax element associated with the video sequence. The video sequence is encoded using the maximum transform size based on determining the maximum transform size associated with the video sequence. The video sequence is transmitted based on encoding the video sequence using the maximum transform size.

公开(公告)号：US12166998B2

公开(公告)日：2024-12-10

申请号：US17903697

申请日：2022-09-06

Applicant: Tencent America LLC

Inventor： Lien-Fei Chen ,  Xiang Li ,  Shan Liu

IPC: H04N19/14 ,  H04N19/105 ,  H04N19/176

Abstract: A method and an apparatus for video decoding are provided. The apparatus includes processing circuitry that decodes prediction information of one or more blocks including a current block from a coded video bitstream. The prediction information indicates that local illumination compensation (LIC) is applied to the one or more blocks and includes LIC information of the one or more blocks. The processing circuitry determines a final scaling factor α_f1 and a final offset β_f1 of a first subblock in the current block based on the LIC information. The processing circuitry determines an updated first predictor subblock in a predictor corresponding to the current block based on the final scaling factor α_f1, the final offset β_f1, and the first predictor subblock. An updated value of a first sample in the first predictor subblock is equal to α_f1×p_i1+β_f1. p_i1 is a value of the first sample.

公开(公告)号：US20240406384A1

公开(公告)日：2024-12-05

申请号：US18806500

申请日：2024-08-15

Applicant: Tencent America LLC

Inventor： Guichun LI ,  Xiang Li ,  Lien-Fei Chen ,  Shan Liu

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

Abstract: In a method of decoding performed in a decoder, a syntax element indicating a prediction mode associated with a current block in a current picture is received, the prediction mode being one of a uni-prediction mode and a bi-prediction mode. When the bi-prediction mode is applied to a first subblock of a plurality of subblocks of the current block and one of (i) a boundary of a first reference subblock is beyond a boundary of a first reference picture or (ii) a boundary of a second reference subblock is beyond a boundary of a second reference picture, the first subblock of the current block is reconstructed based on the uni-prediction mode such that the first subblock is reconstructed based on one of the first reference picture and the second reference picture.

公开(公告)号：US12160567B2

公开(公告)日：2024-12-03

申请号：US17962328

申请日：2022-10-07

Applicant: Tencent America LLC

Inventor： Xiang Li ,  Xiaozhong Xu ,  Guichun Li ,  Shan Liu

IPC: H04N19/107 ,  H04N19/139 ,  H04N19/176 ,  H04N19/196 ,  H04N19/61

Abstract: A method of video decoding performed in a video decoder includes receiving a coded video bitstream including a current block that is divided into a plurality of sub-blocks. Sub-block based affine motion compensation is performed on the current block to generate a sub-block prediction for each pixel in each sub-block of the current block. One or more spatial gradients are determined for each sub-block prediction. For each sub-block prediction, prediction refinement with optical flow process is performed using the respective determined one or more spatial gradients and at least one constraint included in the coded video bitstream. For each sub-block prediction, an output of the respective prediction refinement is added to the respective sub-block prediction to generate a final prediction for each pixel in each sub-block of the current block.