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    VARIABLE NUMBER OF INTRA MODES FOR VIDEO CODING
    13.
    发明申请
    VARIABLE NUMBER OF INTRA MODES FOR VIDEO CODING 审中-公开

    公开(公告)号：US20200068194A1

    公开(公告)日：2020-02-27

    申请号：US16670759

    申请日：2019-10-31

    Applicant: QUALCOMM Incorporated

    Inventor： Vadim Seregin ,  Nan Hu ,  Wei-Jung Chien ,  Marta Karczewicz ,  Xin Zhao ,  Vijayaraghavan Thirumalai

    IPC: H04N19/11 ,  H04N19/593 ,  H04N19/176 ,  H04N19/159 ,  H04N19/463 ,  H04N19/157

    Abstract: A video coder determines a first block of the video data is intra mode coded; based on a first height and the first width of the first block, identifies a group of N available intra prediction modes for the first block of video data; selects from the group of N available intra prediction modes, a first intra prediction mode used to code the first block of the video data; and codes the first block using the first intra prediction mode. A video coder generates a first most probable mode (MPM) candidate list for the block; codes a first flag indicating an actual intra prediction mode used to code the block is not included in the first MPM candidate list; generates a second MPM candidate list by deriving at least one candidate intra prediction mode based on an intra prediction mode in the first MPM candidate list.

    Encoding optimization with illumination compensation and integer motion vector restriction
    15.
    发明授权
    Encoding optimization with illumination compensation and integer motion vector restriction 有权

    公开(公告)号：US10542280B2

    公开(公告)日：2020-01-21

    申请号：US15865054

    申请日：2018-01-08

    Applicant: QUALCOMM Incorporated

    Inventor： Yu-Chen Sun ,  Wei-Jung Chien ,  Li Zhang ,  Yi-Wen Chen ,  Nan Hu ,  Marta Karczewicz

    IPC: H04N19/00 ,  H04N19/52 ,  H04N19/44 ,  H04N19/91

    Abstract: A video encoder is configured to determine whether to enable or disable an integer motion vector precision restriction and whether to enable or disable an illumination compensation (IC) tool by: for a large search range in a reference picture, performing first motion estimation tests, wherein performing the first motion estimation tests comprises performing motion estimation tests only with the IC tool disabled and the integer motion vector precision restriction disabled and with the IC tool enabled and the integer motion vector precision restriction disabled; based on the first motion estimation tests, determining a small search range, wherein the small search range is smaller than the large search range; for the small search range, performing second motion estimation tests; and based on the second motion estimation tests, determining whether to enable or disable the integer motion vector precision restriction and whether to enable or disable the IC tool.

    ENCODING OPTIMIZATION WITH ILLUMINATION COMPENSATION AND INTEGER MOTION VECTOR RESTRICTION
    19.
    发明申请
    ENCODING OPTIMIZATION WITH ILLUMINATION COMPENSATION AND INTEGER MOTION VECTOR RESTRICTION 审中-公开

    公开(公告)号：US20180199055A1

    公开(公告)日：2018-07-12

    申请号：US15865054

    申请日：2018-01-08

    Applicant: QUALCOMM Incorporated

    Inventor： Yu-Chen Sun ,  Wei-Jung Chien ,  Li Zhang ,  Yi-Wen Chen ,  Nan Hu ,  Marta Karczewicz

    IPC: H04N19/52 ,  H04N19/91 ,  H04N19/44

    Abstract: A video encoder is configured to determine whether to enable or disable an integer motion vector precision restriction and whether to enable or disable an illumination compensation (IC) tool by: for a large search range in a reference picture, performing first motion estimation tests, wherein performing the first motion estimation tests comprises performing motion estimation tests only with the IC tool disabled and the integer motion vector precision restriction disabled and with the IC tool enabled and the integer motion vector precision restriction disabled; based on the first motion estimation tests, determining a small search range, wherein the small search range is smaller than the large search range; for the small search range, performing second motion estimation tests; and based on the second motion estimation tests, determining whether to enable or disable the integer motion vector precision restriction and whether to enable or disable the IC tool.

    Derived intra prediction modes and most probable modes in video coding
    20.
    发明授权
    Derived intra prediction modes and most probable modes in video coding 有权

    公开(公告)号：US12192469B2

    公开(公告)日：2025-01-07

    申请号：US17804972

    申请日：2022-06-01

    Applicant: QUALCOMM Incorporated

    Inventor： Keming Cao ,  Nan Hu ,  Vadim Seregin ,  Marta Karczewicz

    IPC: H04N11/02 ,  H04N19/105 ,  H04N19/132 ,  H04N19/146 ,  H04N19/159 ,  H04N19/176

    Abstract: A method of encoding or decoding video data comprises: for each respective intra prediction mode of a plurality of intra prediction modes in a most-probable mode (MPM) list: generating, based on reference samples for a template region and using the respective intra prediction mode, prediction samples for the template region; and determining a cost for the respective intra prediction mode; determining a first intra prediction mode and a second intra prediction mode in the MPM list having lowest costs; determining a preliminary prediction block for the first intra prediction mode and a preliminary prediction block for the second intra prediction mode; generating a prediction block based on a fusion of the preliminary prediction blocks weighted according to a weight for the first intra prediction mode and a weight for the second intra prediction mode.

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