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公开(公告)号：US20250088664A1
公开(公告)日：2025-03-13
申请号：US18963111
申请日：2024-11-27
Applicant: Tencent America LLC
IPC: H04N19/593 , H04N19/176 , H04N19/70
Abstract: Aspects of the disclosure provide methods, apparatuses, and non-transitory computer-readable storage mediums for video encoding/decoding. In a method, prediction information for a current block is encoded. The prediction information indicates a secondary transform index, based on which a secondary transform core is determined. A first primary transform coefficient block is generated based on a primary transform core of the current block. A size of the first primary transform coefficient block is less than a size of the secondary transform core. A second primary transform coefficient block is generated based on the first primary transform coefficient block. A size of the second primary transform coefficient block equals the size of the secondary transform core. A secondary transform coefficient block is determined based on the second primary transform coefficient block and the secondary transform core. The current block is encoded based on the secondary transform coefficient block.
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公开(公告)号：US20250080730A1
公开(公告)日：2025-03-06
申请号：US18523374
申请日：2023-11-29
Applicant: TENCENT AMERICA LLC
Inventor： Xin ZHAO , Han GAO , Liang ZHAO , Jing YE , Shan LIU
IPC: H04N19/117 , H04N19/132 , H04N19/167 , H04N19/176 , H04N19/186 , H04N19/196 , H04N19/70
Abstract: This disclosure generally describes a set of advanced video coding technologies, and is specifically related to cross-component sample offset (CCSO) filtering. For example, a CCSO filter having fractional CCSO filtering tap positions may be used to generate sample offsets from one color component of a reconstructed video. The sample offsets may then be applied to a second color component of the reconstructed video. The reconstructed samples of the first color component may first be interpolated by an interpolation filter in order to generate interpolated samples of the first color component at the fractional CCSO tap positions. The interpolated samples may be used as input to the CCSO filter for the generation of the sample offsets.
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公开(公告)号：US20250063171A1
公开(公告)日：2025-02-20
申请号：US18497697
申请日：2023-10-30
Applicant: TENCENT AMERICA LLC
Inventor： Xin ZHAO , Liang ZHAO , Han GAO , Yushin CHO , Jing YE , Shan LIU
IPC: H04N19/132 , H04N19/105 , H04N19/176 , H04N19/70
Abstract: This disclosure relates generally to video coding and particularly to methods and systems for deriving context adaptive interpolation filter used for generating prediction samples in inter prediction involving a fractional motion vector or block vector. For example, an encoder and a decoder may derive interpolation filters adaptively using reconstructed samples. The reconstructed samples may belong to templates near a current block and a reference block related by the motion vector or block vector. The derivation of the adaptive interpolation filters may be based on minimizing distortions between interpolated templates associated with the reference block and the templates associated with the current block.
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公开(公告)号：US20250063156A1
公开(公告)日：2025-02-20
申请号：US18903317
申请日：2024-10-01
Applicant: Tencent America LLC
Inventor： Xiaozhong XU , Xin ZHAO , Shan LIU
IPC: H04N19/105 , H04N19/132 , H04N19/159 , H04N19/176 , H04N19/46 , H04N19/70
Abstract: This disclosure relates generally to video coding and particularly to intra block copy coding mode. For example, a method is disclosed for reconstructing a video block in a video stream. The method may include extracting at least one syntax element from the video stream, the at least one syntax element being associated with an intra block copy (IBC) prediction of the video block; determining an IBC referencing mode for the IBC prediction of the video block, the IBC referencing mode comprises one of no-IBC mode, a local-referencing IBC mode, a non-local-referencing IBC mode, and a local-and-non-local-referencing IBC mode; and generating reconstructed samples of the video block from the video stream based on the IBC referencing mode.
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公开(公告)号：US20250024042A1
公开(公告)日：2025-01-16
申请号：US18621713
申请日：2024-03-29
Applicant: Tencent America LLC
IPC: H04N19/149 , H04N19/105 , H04N19/154
Abstract: Methods, apparatus, and computer readable storage medium evaluating codec performance. One method includes obtaining m anchor data points each generated based on a respective anchor encoded video bitstream; obtaining n test data points each generated based on a respective encoded test video bitstream, n being an integer; fitting the m anchor data points with an anchor curve, the anchor curve being based on an anchor polynomial, wherein the anchor polynomial is monotonic in an x-axis range; fitting the n test data points with a test curve, the anchor curve being based on a test polynomial, wherein the test polynomial is monotonic in the x-axis range; and evaluating the test codec performance based on the anchor curve and the test curve, to obtain an evaluation result.
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Patent Agency Ranking
公开(公告)号：US20250024019A1
公开(公告)日：2025-01-16
申请号：US18893095
申请日：2024-09-23
Applicant: TENCENT AMERICA LLC
Inventor： Madhu PERINGASSERY KRISHNAN , Xin ZHAO , Shan LIU
IPC: H04N19/105 , H04N19/132 , H04N19/159 , H04N19/176
Abstract: This disclosure relates transform configuration and signaling for a compound inter intra prediction modes. In one example, a method for decoding a video block in a video stream is disclosed. The method may include determining that the video block is predicted in a Compound Inter Intra Prediction (CIIP) mode, wherein the video block is derived as a combination of an intra prediction and an inter prediction in the CIIP mode. The method further includes determining at least one inter intra prediction weighting configuration for the video block; identifying a data-driven transform kernel for the video block among a transform kernel set; generating a residual block of the video block by inverse-transforming, using at least the data-driven transform kernel, a set of transform coefficients extracted from the video stream for the video block; and deriving the video block based on the residual block, the at least one inter intra prediction weighting configuration, at least one reconstructed inter-prediction block of the video block, and at least one reconstructed intra-prediction reference sample of the video block.
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公开(公告)号：US20250008122A1
公开(公告)日：2025-01-02
申请号：US18384308
申请日：2023-10-26
Applicant: Tencent America LLC
Inventor： Xin ZHAO , Liang ZHAO , Han GAO , Jing YE , Tianqi LIU , Shan LIU
IPC: H04N19/176 , H04N19/105 , H04N19/122 , H04N19/124 , H04N19/13 , H04N19/132 , H04N19/159 , H04N19/172 , H04N19/18 , H04N19/463 , H04N19/61
Abstract: A video bitstream comprising coded information of a plurality of partial residual blocks of a current block in a current picture is received. Each of the plurality of partial residual blocks indicates a difference between a respective prediction block of the current block and the current block. The plurality of partial residual blocks of the current block is determined based on respective coding parameters. A residual block is determined based on the plurality of partial residual blocks. A prediction block for the current block is determined. The current block is reconstructed based on a combination of the derived residual block and the determined prediction block.
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公开(公告)号：US20240348784A1
公开(公告)日：2024-10-17
申请号：US18751117
申请日：2024-06-21
Applicant: TENCENT AMERICA LLC
Inventor： Liang ZHAO , Xin ZHAO , Shan LIU
IPC: H04N19/13 , H04N19/159 , H04N19/176 , H04N19/186
CPC classification number: H04N19/13 , H04N19/159 , H04N19/176 , H04N19/186
Abstract: An example method of video decoding includes receiving a video bitstream that comprises a chroma component and a luma component. The method further includes identifying a context based on a nominal angle corresponding to the chroma component, and entropy-decoding an indicator from the video bitstream according to the context, the indicator corresponding to a delta angle for the chroma component. The method also includes decoding video data from the video bitstream using the delta angle.
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公开(公告)号：US20240323440A1
公开(公告)日：2024-09-26
申请号：US18731736
申请日：2024-06-03
Applicant: TENCENT AMERICA LLC
Inventor： Xin ZHAO , Madhu Peringassery KRISHNAN , Shan LIU , Xiang LI
IPC: H04N19/60 , H04N19/105 , H04N19/159 , H04N19/186
CPC classification number: H04N19/60 , H04N19/105 , H04N19/159 , H04N19/186
Abstract: A method for coding video data, executable by a processor, includes receiving video data; entropy-parsing the received video data into one or more components; de-quantizing the one or more entropy-parsed components; performing a joint component secondary transformation (JCST) on the one or more components in accordance with a JCST kernel selected based on one of (i) a prediction mode corresponding to the video data, (ii) a primary transform type of a current block, and (iii) a secondary transform kernel selected for the current block; and decoding the video data based on one or more residual components corresponding to the joint component secondary transformed components.
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公开(公告)号：US20240314360A1
公开(公告)日：2024-09-19
申请号：US18674486
申请日：2024-05-24
Applicant: TENCENT AMERICA LLC
Inventor： Madhu Peringassery KRISHNAN , Xin ZHAO , Shan LIU
Abstract: A method, computer program, and computer system is provided for coding video data. Video data is received. One or more transform cores corresponding to a transform associated with the video data are identified. The one or more transform cores include one or more of a line graph transform (LGT) and a discrete sine transform (DST) The video data is decoded based on the identified transform core. The transform cores correspond to one or more from among an 8-bit transform core and a 10-bit transform core. The transform corresponds to one or more from among a 2-point transform, a 4-point transform, an 8-point transform, and a 16-point transform.
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