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    Clipping laser indices in predictive geometry coding for point cloud compression
    6.
    发明授权
    Clipping laser indices in predictive geometry coding for point cloud compression 有权

    公开(公告)号：US12033360B2

    公开(公告)日：2024-07-09

    申请号：US17491114

    申请日：2021-09-30

    Applicant: QUALCOMM Incorporated

    Inventor： Adarsh Krishnan Ramasubramonian ,  Bappaditya Ray ,  Geert Van der Auwera ,  Marta Karczewicz

    IPC: G06T9/00 ,  G01S17/89

    CPC classification number: G06T9/001 ,  G01S17/89

    Abstract: A method of encoding a point cloud includes determining, by one or more processors, a quantity of lasers used to capture light detection and ranging (LIDAR) data that represents the point cloud; and encoding, by the one or more processors, a laser index for a current node of the point cloud, wherein encoding the laser index comprises: obtaining a predicted laser index value of the current node; determining a residual laser index value for the current node, wherein determining the residual laser index value comprises constraining a sum of the residual laser index value and the predicted laser index value to be less than or equal to the determined quantity of lasers minus one; and encoding, in a bitstream, one or more syntax elements that represent the residual laser index value.

    Predictive geometry coding in G-PCC
    8.
    发明授权
    Predictive geometry coding in G-PCC 有权

    公开(公告)号：US11935270B2

    公开(公告)日：2024-03-19

    申请号：US17449013

    申请日：2021-09-27

    Applicant: QUALCOMM Incorporated

    Inventor： Bappaditya Ray ,  Adarsh Krishnan Ramasubramonian ,  Geert Van der Auwera ,  Marta Karczewicz

    IPC: G06K9/36 ,  G01S7/48 ,  G01S13/42 ,  G06T9/00 ,  G06T9/40

    CPC classification number: G06T9/001 ,  G01S7/4808 ,  G01S13/42 ,  G06T9/40 ,  G01S7/4802

    Abstract: An example method of decoding a point cloud includes selecting, from a plurality of predefined prediction modes, a prediction mode for performing predictive geometry coding of a position of a current node of the point cloud, wherein the plurality of prediction modes includes at least: a zero prediction mode, and a delta prediction mode; responsive to selecting the zero prediction mode: determining a radius, an azimuth, and a laser index of a parent node of the current node; inferring an azimuth and a laser index of a predicted position of the current node as the azimuth and the laser index of the parent node; inferring a radius of the predicted position to be a minimum radius value, wherein the minimum radius value is different than the radius of the parent node; and determining, based on the predicted position of the current node, the position of the current node.

    INTRA CHROMA MODE LIST CONSTRUCTION FOR VIDEO CODING
    9.
    发明公开
    INTRA CHROMA MODE LIST CONSTRUCTION FOR VIDEO CODING 审中-公开

    公开(公告)号：US20230336716A1

    公开(公告)日：2023-10-19

    申请号：US18187517

    申请日：2023-03-21

    Applicant: QUALCOMM Incorporated

    Inventor： Yao-Jen Chang ,  Keming Cao ,  Bappaditya Ray ,  Vadim Seregin ,  Marta Karczewicz

    IPC: H04N19/186 ,  H04N19/11 ,  H04N19/176

    CPC classification number: H04N19/11 ,  H04N19/176 ,  H04N19/186

    Abstract: A method of encoding or decoding video data includes constructing a list of chroma intra-prediction modes for a chroma block of a current block of the video data, wherein constructing includes adding intra-prediction modes of a first group to the list of chroma intra-prediction modes, the first group comprising two or more intra-prediction modes derived from intra-prediction modes of two or more co-located luma blocks of the current block that are co-located with the chroma block; determining an intra-prediction mode for the chroma block from the list of chroma intra-prediction modes; and encoding or decoding the chroma block based on the intra-prediction mode.

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