公开(公告)号：US20240323420A1

公开(公告)日：2024-09-26

申请号：US18680996

申请日：2024-05-31

Applicant: Tencent America LLC

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

IPC: H04N19/44 ,  H04N19/105 ,  H04N19/132 ,  H04N19/176 ,  H04N19/46

CPC classification number: H04N19/44 ,  H04N19/105 ,  H04N19/132 ,  H04N19/176 ,  H04N19/46

Abstract: An apparatus includes processing circuitry that is configured to receive a bitstream including coded information of a current block. The processing circuitry is configured to partition the current block into a first partition and a second partition based on a geometric partition mode (GPM). The processing circuitry is configured to determine a first prediction mode for the first partition based on a first number of direct neighboring reconstructed samples of the current block being larger than a threshold value. The processing circuitry is configured t0, when the first number of direct neighboring reconstructed samples of the current block is less than the threshold value, infer that the first prediction mode is inter prediction mode, a flag indicating whether the current block is intra coded or inter coded not being signaled in the bitstream, and reconstruct the first partition of the current block based on the first prediction mode.

公开(公告)号：US20240137534A1

公开(公告)日：2024-04-25

申请号：US18402561

申请日：2024-01-02

Applicant: TENCENT AMERICA LLC

Inventor： Ling LI ,  Xin ZHAO ,  Xiang Li ,  Shan LIU

IPC: H04N19/186 ,  H04N19/124 ,  H04N19/136 ,  H04N19/176 ,  H04N19/70

CPC classification number: H04N19/186 ,  H04N19/124 ,  H04N19/136 ,  H04N19/176 ,  H04N19/70

Abstract: In a method of video encoding, whether an adaptive color transform (ACT) is to be applied to a current block is determined. The current block includes color components, the color components including a luma component, a first chroma component, and a second chroma component. Based on the ACT being determined to be applied to the current block, a color space conversion is applied on the current block based on color space conversion equations to generate modified color components of the current block. The current block is encoded based on the modified color components of the current block.

公开(公告)号：US20230179784A1

公开(公告)日：2023-06-08

申请号：US17888558

申请日：2022-08-16

Applicant: Tencent America LLC

Inventor： Ling LI ,  Shan LIU

IPC: H04N19/44 ,  H04N19/105 ,  H04N19/88 ,  H04N19/176

CPC classification number: H04N19/44 ,  H04N19/105 ,  H04N19/88 ,  H04N19/176

Abstract: In a method of video decoding performed in a video decoder, coded information of a current block and neighboring blocks of the current block is received from a coded video bitstream. A most probable mode (MPM) list is generated for the current block. The MPM list includes intra modes that are determined based on intra modes of the neighboring blocks of the current block. One of gradient values and cost values of the neighboring blocks are calculated based on the intra modes of the MPM list. The intra modes of the MPM list are sorted based on the one of the gradient values and the cost values of the neighboring blocks, where each of the intra modes in the MPM list is associated with a respective one of the gradient value and the cost value. Further, the current block is reconstructed based on the MPM list.

公开(公告)号：US20230026630A1

公开(公告)日：2023-01-26

申请号：US17956358

申请日：2022-09-29

Applicant: Tencent America LLC

Inventor： Ling LI ,  Xiang LI ,  Guichun LI ,  Shan LIU

IPC: H04N19/196 ,  H04N19/176 ,  H04N19/172

Abstract: Aspects of the disclosure provide a method and an apparatus including processing circuitry for video encoding. The processing circuitry determines a maximum number of geometric merge mode merge candidates, and generates maximum number of geometric merge mode candidates information based on a relation between the maximum number of geometric merge mode merge candidates and a maximum number of merge candidates. The processing circuitry generates a coded video bitstream including coding information. The coding information indicates that a geometric merge mode is enabled for a coding level higher than a picture level of a current picture and the maximum number of merge candidates satisfies a condition. The maximum number of geometric merge mode merge candidates is equal to the maximum number of merge candidates minus a value indicated by the maximum number of geometric merge mode candidates information.

公开(公告)号：US20210266550A1

公开(公告)日：2021-08-26

申请号：US17094398

申请日：2020-11-10

Applicant: TENCENT AMERICA LLC

Inventor： Ling LI ,  Xiang LI ,  Shan LIU

IPC: H04N19/124 ,  H04N19/186 ,  H04N19/70 ,  H04N19/184 ,  H04N19/172

Abstract: According to an aspect of the disclosure, a method of video decoding performed in a video decoder is provided. In the method, syntax information of a coding unit (CU) is decoded from a coded video bitstream. The syntax information is signaled in a picture header (PH) and includes chroma quantization parameter (QP) offsets in a PH level. The chroma QP offsets include at least one of a Cb offset, a Cr offset, and a CbCr offset. Further, quantization parameters for the CU are determined based on the chroma QP offsets in the PH level and a quantization parameter range offset of the CU.

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.

公开(公告)号：US20230164350A1

公开(公告)日：2023-05-25

申请号：US17828872

申请日：2022-05-31

Applicant: Tencent America LLC

Inventor： Ling LI ,  Xiang LI ,  Shan LIU

IPC: H04N19/56 ,  H04N19/44 ,  H04N19/184 ,  H04N19/70 ,  H04N19/176

CPC classification number: H04N19/56 ,  H04N19/44 ,  H04N19/184 ,  H04N19/70 ,  H04N19/176

Abstract: A method for video encoding includes generating a first syntax element indicating a maximum number of merge motion vector prediction (MVP) candidates, and encoding the first syntax element at a first coding level in a coded video bitstream, the first coding level being higher than a picture parameter set (PPS) level. The video encoding method also includes transmitting the coded video bitstream including the first syntax element. The maximum number of merge MVP candidates indicated by the first syntax element is applicable for reconstructing coding blocks of the coded video bitstream associated with the first coding level.

公开(公告)号：US20230079960A1

公开(公告)日：2023-03-16

申请号：US17901547

申请日：2022-09-01

Applicant: Tencent America LLC

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

IPC: H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/172

Abstract: According to an aspect of the disclosure, a method of video decoding performed in a video decoder is provided. In the method, coded information of a current block in a current picture of a video is received from a coded video bitstream. The coded information indicates that the current block is an intra block copy (IBC) block. An intra prediction mode is derived for a subblock of the current block based on a reference subblock in a reference block. The reference subblock corresponds to the subblock of the current block, and the reference block is referenced by a block vector of the IBC block. The intra prediction mode for the subblock of the current block is further stored. A neighboring block of the current block is determined as an IBC block. A most probable mode (MPM) list is constructed for the neighboring block using the stored intra prediction mode.

公开(公告)号：US20230033501A1

公开(公告)日：2023-02-02

申请号：US17877835

申请日：2022-07-29

Applicant: Tencent America LLC

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

IPC: H04N19/44 ,  H04N19/105 ,  H04N19/132 ,  H04N19/176 ,  H04N19/46

Abstract: Coded information of a current block is received. The current block is partitioned into at least a first partition and a second partition based on a geometric partition mode (GPM). A first prediction mode for the first partition of the current block is determined based on a first number of neighboring reconstructed samples adjacent to the first partition being larger than a threshold value. The threshold value corresponds to availability of at least one intra prediction mode for the GPM. In response to the first number of neighboring reconstructed samples adjacent to the first partition being smaller than the threshold value, a flag indicating whether the current block is intra coded or inter coded is determined not to be included in the coded information. The first prediction mode is inferred as inter prediction mode. The first partition of the current block is reconstructed based on the first prediction mode.

公开(公告)号：US20220337871A1

公开(公告)日：2022-10-20

申请号：US17856219

申请日：2022-07-01

Applicant: Tencent America LLC

Inventor： Ling LI ,  Byeongdoo CHOI ,  Xiang LI ,  Stephan WENGER ,  Shan LIU

IPC: H04N19/593 ,  H04N19/174 ,  H04N19/70 ,  H04N19/46 ,  H04N19/159

Abstract: A method of video encoding includes determining that a coded video bitstream conforms to one of a Main 10 still picture profile or a Main 4:4:4 10 still picture profile and generating profile information that indicates that each of the image slices is to be intra coded and indicates the one of the Main 10 still picture profile or the Main 4:4:4 10 still picture profile. The method further includes constraining only one picture to be included in the coded video bitstream according to the one of the Main 10 still picture profile or the Main 4:4:4 10 still picture profile. The method also includes performing intra prediction on each of the image slices, and encoding the picture based on the intra prediction and according to the one of the Main 10 still picture profile or the Main 4:4:4 10 still picture profile to form the coded video bitstream.