中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

37 records (took 0.024 seconds)

    Block shape adaptive intra prediction directions for quadtree-binary tree
    1.
    发明授权
    Block shape adaptive intra prediction directions for quadtree-binary tree 有权

    公开(公告)号：US12278950B2

    公开(公告)日：2025-04-15

    申请号：US18385457

    申请日：2023-10-31

    Applicant: INTERDIGITAL VC HOLDINGS, INC.

    Inventor： Fabrice Leleannec ,  Fabien Racape ,  Gagan Rath ,  Fabrice Urban

    IPC: H04N19/105 ,  H04N19/11 ,  H04N19/147 ,  H04N19/159 ,  H04N19/176 ,  H04N19/593 ,  H04N19/96

    Abstract: A video encoder or decoder processes portions of video using intra coding and with variable block shapes. Under the general aspects, intra prediction directions are adapted to the block shape or aspect ratio. The general aspects described adaptively replace several conventional angular intra prediction modes with wide-angle intra prediction modes for non-square blocks. The total number of angular directions for any block can remain the same as in prior video coding standards or can be reduced or expanded. To keep the same number of prediction directions, directions along a shorter rectangular edge of a target block are removed but replaced with addition directions along the longer edge of the rectangular target block. For directions with wide angles, reference sample smoothing is performed. Signaling can be provided to inform a corresponding decoder regarding the prediction modes and directions.

    Method and a device for picture encoding and decoding
    5.
    发明授权
    Method and a device for picture encoding and decoding 有权

    公开(公告)号：US11483576B2

    公开(公告)日：2022-10-25

    申请号：US17047248

    申请日：2019-03-19

    Applicant: InterDigital VC Holdings, Inc.

    Inventor： Tangi Poirier ,  Philippe Bordes ,  Fabrice Urban

    IPC: H04N19/00 ,  H04N19/184 ,  H04N19/176

    Abstract: A method for encoding a picture block is disclosed. A predictor is determined as a weighted sum of sample values of a first motion compensated reference block in a first reference image and of a second motion compensated reference block in a second reference image. Then, a residual block determined from the picture block and the predictor is encoded in a bitstream. Advantageously, the weights of the weighted sum are determined by minimizing an error between reconstructed samples neighboring the picture block and samples neighboring the first and second reference blocks.

    Boundary filtering for planar and DC modes in intra prediction
    6.
    发明授权
    Boundary filtering for planar and DC modes in intra prediction 有权

    公开(公告)号：US11368677B2

    公开(公告)日：2022-06-21

    申请号：US17047049

    申请日：2019-04-29

    Applicant: InterDigital VC Holdings, Inc.

    Inventor： Gagan Bihari Rath ,  Fabien Racape ,  Fabrice Urban

    IPC: H04N19/105 ,  H04N19/117 ,  H04N19/176 ,  H04N19/593

    Abstract: When a block is intra predicted, the predicted samples on the boundary are subject to boundary filtering for certain modes. Various embodiments are proposed to perform boundary filtering for intra prediction in the DC or PLANAR mode, using a gradient based approach. The gradient for a particular reference sample is calculated based on a difference between the particular reference sample and a predictor for predicting the particular reference sample. For the PLANAR mode, the difference between a top (left) reference sample and a linear interpolation using the top (left) reference samples is used as the gradient, a fractional part of which is propagated to the initial predicted samples with a decay function. For the DC mode, the difference between a top (left) reference sample and an average of reference samples is used as the gradient. The average can be computed with the top reference samples and/or left reference samples.

    Method and apparatus for encoding a video
    8.
    发明授权
    Method and apparatus for encoding a video 有权

    公开(公告)号：US10965938B2

    公开(公告)日：2021-03-30

    申请号：US16340127

    申请日：2017-08-31

    Applicant: INTERDIGITAL VC HOLDINGS, INC.

    Inventor： Fabrice Urban ,  Tangi Poirier ,  Fabrice Leleannec

    IPC: H04N19/103 ,  H04N19/119 ,  H04N19/147 ,  H04N19/176 ,  H04N19/46

    Abstract: A method and an apparatus for encoding a video are disclosed. For at least one block from a picture of said video, a first rate-distortion optimization is performed (602) for determining for a first splitting mode of said block into at least one first subblock, coding parameters of said at least one first subblock. At least one second rate-distortion optimization is performed (609) for determining for at least one second splitting mode of said block into at least one second subblock, coding parameters of said at least one second subblock. A best splitting mode for coding said block is determined (613) according to at least said first rate-distortion optimization and said second rate-distortion optimization, and said block is encoded (616) according to said best splitting mode. While performing (609) said at least one second rate-distortion optimization and when said at least one second subblock is located at a same position in the picture as said at least one first subblock and said at least one second subblock has a same width and same height as said at least one first subblock, at least one coding parameter of said at least one first subblock determined during said first rate-distortion optimization is used (605) for determining said coding parameters for said at least one second subblock.

    Method and apparatus for encoding and decoding motion information
    9.
    发明授权
    Method and apparatus for encoding and decoding motion information 有权

    公开(公告)号：US10911759B2

    公开(公告)日：2021-02-02

    申请号：US16475345

    申请日：2017-12-26

    Applicant: InterDigital VC Holdings, Inc.

    Inventor： Antoine Robert ,  Tangi Poirier ,  Fabrice Urban

    IPC: H04N19/139 ,  H04N19/105 ,  H04N19/164 ,  H04N19/176 ,  H04N19/52 ,  H04N19/513

    Abstract: A Frame Rate Up-Conversion (FRUC) derivation process, based on frame rate up-conversion techniques, is developed in the reference software JEM (Joint Exploration Model) by the Joint Video Exploration Team (JVET). In one embodiment, a modified FRUC derivation process improves the performance of the current FRUC tool is provided. For example, an initial list of motion vector candidates defined in the FRUC derivation process may be reordered, and/or one or more of the ordered motion vector candidates in the defined list may be removed to improve the efficiency of the process. The reordering and/or the removal may be based on, e.g., one or more of previously determined motion vector candidates of one or more previously decoded blocks. In addition, the adaptive reordering mode may be signaled by the encoder to the decoder as part of the modified FRUC derivation process.

Patent Agency Ranking