公开(公告)号：US20240380892A1

公开(公告)日：2024-11-14

申请号：US18782868

申请日：2024-07-24

Applicant: InterDigital VC Holdings, Inc.

Inventor： Yuwen He ,  Xiaoyu Xiu ,  Yan Ye ,  Jiancong Luo

IPC: H04N19/137 ,  H04N19/159 ,  H04N19/176 ,  H04N19/192

Abstract: Systems and methods are described for video coding using affine motion models with adaptive precision. In an example, a block of video is encoded in a bitstream using an affine motion model, where the affine motion model is characterized by at least two motion vectors. A precision is selected for each of the motion vectors, and the selected precisions are signaled in the bitstream. In some embodiments, the precisions are signaled by including in the bitstream information that identifies one of a plurality of elements in a selected predetermined precision set. The identified element indicates the precision of each of the motion vectors that characterize the affine motion model. In some embodiments, the precision set to be used is signaled expressly in the bitstream; in other embodiments, the precision set may be inferred, e.g., from the block size, block shape or temporal layer.

公开(公告)号：US20250008154A1

公开(公告)日：2025-01-02

申请号：US18884059

申请日：2024-09-12

Applicant: InterDigital VC Holdings, Inc.

Inventor： Yan Zhang ,  Xiaoyu Xiu ,  Yuwen He ,  Yan Ye

IPC: H04N19/583 ,  H04N19/139 ,  H04N19/176 ,  H04N19/189

Abstract: Overlapped block motion compensation (OBMC) may be performed for a current video block based on motion information associated with the current video block and motion information associated with one or more neighboring blocks of the current video block. Under certain conditions, some or all of these neighboring blocks may be omitted from the OBMC operation of the current block. For instance, a neighboring block may be skipped during the OBMC operation if the current video block and the neighboring block are both uni-directionally or bi-directionally predicted, if the motion vectors associated with the current block and the neighboring block refer to a same reference picture, and if a sum of absolute differences between those motion vectors is smaller than a threshold value. Further, OBMC may be conducted in conjunction with regular motion compensation and may use simplified filters than traditionally allowed.

公开(公告)号：US20250055995A1

公开(公告)日：2025-02-13

申请号：US18927182

申请日：2024-10-25

Applicant: InterDigital VC Holdings, Inc.

Inventor： Hua Yang ,  Yuwen He ,  Wei Chen

IPC: H04N19/119 ,  H04N19/105 ,  H04N19/159 ,  H04N19/176

Abstract: Systems, methods, and instrumentalities may be used for decoding and/or encoding a coding unit (CU). An intra-prediction mode for a CU may be determined. A split mode may be determined based on the intra-prediction mode, to generate a plurality of sub-partitions in the CU. A prediction for a first sub-partition of the plurality of sub-partitions in the CU may be based on a reference sample in a second sub-partition of the plurality of sub-partitions in the CU. The CU may be decoded and/or encoded, for example, based on the determined split mode.

公开(公告)号：US12200222B2

公开(公告)日：2025-01-14

申请号：US18521810

申请日：2023-11-28

Applicant: INTERDIGITAL VC HOLDINGS, INC.

Inventor： Jiancong Luo ,  Yuwen He ,  Wei Chen

IPC: H04N19/137 ,  H04N19/105 ,  H04N19/149 ,  H04N19/176

Abstract: Systems and methods are described for video coding using affine motion prediction. In an example method, motion vector gradients are determined from respective motion vectors of a plurality of neighboring sub-blocks neighboring a current block. An estimate of at least one affine parameter for the current block is determined based on the motion vector gradients. An affine motion model is determined based at least in part on the estimated affine parameter(s), and a prediction of the current block is generated using the affine motion model. The estimated parameter(s) may be used in the affine motion model itself. Alternatively, the estimated parameter(s) may be used in a prediction of the affine motion model. In some embodiments, only neighboring sub-blocks above and/or to the left of the current block are used in estimating the affine parameter(s).

公开(公告)号：US12143626B2

公开(公告)日：2024-11-12

申请号：US18199238

申请日：2023-05-18

Applicant: InterDigital VC Holdings, Inc.

Inventor： Jiancong Luo ,  Yuwen He

IPC: H04N19/52 ,  H04N19/105 ,  H04N19/132 ,  H04N19/139 ,  H04N19/167 ,  H04N19/176 ,  H04N19/55

Abstract: Method, apparatus and systems are disclosed. In one embodiment, a method of decoding includes obtaining a sub-block based motion prediction signal for a current block of the video; obtaining one or more spatial gradients of the sub-block based motion prediction signal or one or more motion vector difference values; obtaining a refinement signal for the current block based on the one or more obtained spatial gradients or the one or more obtained motion vector difference values; obtaining a refined motion prediction signal for the current block based on the sub-block based motion prediction signal and the refinement signal; and decoding the current block based on the refined motion prediction signal.

公开(公告)号：US12231648B2

公开(公告)日：2025-02-18

申请号：US18417274

申请日：2024-01-19

Applicant: InterDigital VC Holdings, Inc.

Inventor： Saurav Bandyopadhyay ,  Xiaoyu Xiu ,  Yuwen He

IPC: H04N19/132 ,  H04N19/105 ,  H04N19/176 ,  H04N19/186

Abstract: Procedures, methods, architectures, apparatuses, systems, devices, and computer program products directed to improved linear model estimation for template-based video coding are provided. Included therein is a method comprising determining minimum and maximum (“min/max”) values of luma and chroma samples neighboring a coding block, wherein the min/max chroma values correspond to the min/max luma values; determining a first linear model parameter of a template-based video coding technique (i) based on a single look-up table and the min/max chroma values and (ii) at a precision no greater than 16 bits; determining a second linear model parameter of the template-based video coding technique (i) based on the first linear model parameter and the minimum chroma and luma values and (ii) at a precision no greater than 16 bits; and predicting chroma samples of the coding block based on reconstructed luma samples of the coding block and the first and second linear model parameters.

公开(公告)号：US20250056038A1

公开(公告)日：2025-02-13

申请号：US18921599

申请日：2024-10-21

Applicant: INTERDIGITAL VC HOLDINGS, INC.

Inventor： Yan Zhang ,  Xiaoyu Xiu ,  Yuwen He ,  Yan Ye

IPC: H04N19/577 ,  H04N19/176 ,  H04N19/31 ,  H04N19/573

Abstract: Exemplary embodiments include systems and methods for coding a video comprising a plurality of pictures including a current picture, a first reference picture, and a second reference picture, where each picture includes a plurality of blocks. In one method, for at least a current block in the current picture, a number of available bi-prediction weights is determined based at least in part on a temporal layer and/or a quantization parameter of the current picture. From among available bi-prediction weights a pair of weights are identified. Using the identified weights, the current block is then predicted as a weighted sum of a first reference block in the first reference picture and a second reference block in the second reference picture. Encoding techniques are also described for efficient searching and selection of a pair of bi-prediction weights to use for prediction of a block.

公开(公告)号：US12200190B2

公开(公告)日：2025-01-14

申请号：US17763024

申请日：2020-09-23

Applicant: INTERDIGITAL VC HOLDINGS, INC.

Inventor： Wei Chen ,  Yuwen He ,  Hua Yang

IPC: H04N19/105 ,  H04N19/117 ,  H04N19/132 ,  H04N19/137 ,  H04N19/176

Abstract: An apparatus may be configured to determine a reference picture listed in a first reference picture list and a reference picture listed in a second reference picture list, for a coding block. The apparatus may be configured to determine whether to perform bi-directional optical flow (BDOF) for the coding block based at least in part on whether a distance between a picture associated with the coding block and the reference picture listed in the first reference picture list differs from a distance between the picture associated with the coding block and the reference picture listed in the second reference picture list. The apparatus may be configured to decode the coding block based on the determination of whether to perform BDOF for the coding block.

公开(公告)号：US12167035B2

公开(公告)日：2024-12-10

申请号：US18112234

申请日：2023-02-21

Applicant: InterDigital VC Holdings, Inc.

Inventor： Xiaoyu Xiu ,  Yuwen He ,  Yan Ye

IPC: H04N19/597 ,  G06T3/00 ,  G06T3/16 ,  H04N19/12 ,  H04N19/61

Abstract: A system, method, and/or instrumentality may be provided for coding a 360-degree video. A picture of the 360-degree video may be received. The picture may include one or more faces associated with one or more projection formats. A first projection format indication may be received that indicates a first projection format may be associated with a first face. A second projection format indication may be received that indicates a second projection format may be associated with a second face. Based on the first projection format, a first transform function associated with the first face may be determined. Based on the second projection format, a second transform function associated with the second face may be determined. At least one decoding process may be performed on the first face using the first transform function and/or at least one decoding process may be performed on the second face using the second transform function.

公开(公告)号：US20250056002A1

公开(公告)日：2025-02-13

申请号：US18932451

申请日：2024-10-30

Applicant: InterDigital VC Holdings, Inc.

Inventor： Wei Chen ,  Yuwen He

IPC: H04N19/137 ,  H04N19/132 ,  H04N19/176 ,  H04N19/33

Abstract: Systems and methods are described for refining motion compensated predictions in block-based video coding. In an example embodiment, motion-compensated prediction is used to generate predicted sample values in a current block of samples. A precision difference value and a motion vector refinement for the current block are signaled in the bitstream. For each sample in the current block, a spatial gradient is calculated at the sample, and a scalar product is calculated between the spatial gradient and the motion vector refinement. The scalar product is scaled (e.g. bit-shifted) by an amount indicated by the precision difference value to generate a sample difference value, and the sample difference value is added to the predicted sample value to generate a refined sample value.