中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

789 records (took 0.019 seconds)

    HISTORY-BASED MOTION VECTOR PREDICTION
    1.
    发明申请
    HISTORY-BASED MOTION VECTOR PREDICTION 有权

    公开(公告)号：US20250159142A1

    公开(公告)日：2025-05-15

    申请号：US19028050

    申请日：2025-01-17

    Applicant: InterDigital VC Holdings, Inc.

    Inventor： Xiaoyu Xiu ,  Yuwen He ,  Jiancong Luo

    IPC: H04N19/105 ,  H04N19/159 ,  H04N19/176 ,  H04N19/51

    Abstract: Systems, methods, and instrumentalities are disclosed for processing history-based motion vector prediction (HMVP). A video coding device may generate a history-based motion vector prediction (HMVP) list for a current block. The video coding device derive an HMVP candidate from a previously coded block. The HMVP candidate may include motion information associated with a neighboring block of the current block, one or more reference indices, and a bi-prediction weight index. The video coding device may add the HMVP candidate to the HMVP list for motion compensated prediction of a motion vector associated with the current block. The video coding device use one HMVP selected from the HMVP list to perform motion compensated prediction of the current block. The motion compensated prediction may be performed using the motion information associated with the neighboring block of the current block, the one or more reference indices, and the bi-prediction weight index.

    Method and apparatus to encode and decode images of points of a sphere
    2.
    发明授权
    Method and apparatus to encode and decode images of points of a sphere 有权

    公开(公告)号：US12283021B2

    公开(公告)日：2025-04-22

    申请号：US17415931

    申请日：2019-12-18

    Applicant: InterDigital VC Holdings, Inc.

    Inventor： Julien Fleureau ,  Bertrand Chupeau ,  Renaud Dore

    IPC: G06T3/073 ,  G06T3/40 ,  G06T9/00

    Abstract: Methods and devices are provided to encode points of a sphere onto an image by projecting them as a function of an isotropic region guided mapping operator and/or to decode pixels of an image onto a sphere by de-projected them according to the same parametrized mapping operator. A region of interest is determined on the sphere and the angular resolution of pixels of the image is modulated as a function of their distance to the reference pixel corresponding to the center of the region of interest. Chosen angular resolutions and size of the region of interest are associated with the image and encoded in a stream.

    AFFINE MOTION MODEL DERIVATION METHOD
    4.
    发明申请
    AFFINE MOTION MODEL DERIVATION METHOD 有权

    公开(公告)号：US20250097429A1

    公开(公告)日：2025-03-20

    申请号：US18967158

    申请日：2024-12-03

    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).

    Methods, architectures, apparatuses and systems directed to improved linear model estimation for template based video coding
    7.
    发明授权
    Methods, architectures, apparatuses and systems directed to improved linear model estimation for template based video coding 有权

    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.

    GENERALIZED BI-PREDICTION FOR VIDEO CODING WITH REDUCED CODING COMPLEXITY
    8.
    发明申请
    GENERALIZED BI-PREDICTION FOR VIDEO CODING WITH REDUCED CODING COMPLEXITY 有权

    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.

    SYSTEMS, APPARATUS AND METHODS FOR INTER PREDICTION REFINEMENT WITH OPTICAL FLOW
    9.
    发明申请
    SYSTEMS, APPARATUS AND METHODS FOR INTER PREDICTION REFINEMENT WITH OPTICAL FLOW 有权

    公开(公告)号：US20250039435A1

    公开(公告)日：2025-01-30

    申请号：US18911319

    申请日：2024-10-10

    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.

    Switching logic for bi-directional optical flow
    10.
    发明授权
    Switching logic for bi-directional optical flow 有权

    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.

Patent Agency Ranking