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    In-tree geometry quantization of point clouds
    132.
    发明授权
    In-tree geometry quantization of point clouds 有权

    公开(公告)号：US12266141B2

    公开(公告)日：2025-04-01

    申请号：US18545966

    申请日：2023-12-19

    Applicant: Apple Inc.

    Inventor： David Flynn ,  Khaled Mammou ,  Fabrice A. Robinet

    IPC: G06T9/40 ,  G06T17/00

    Abstract: An example method includes receiving a plurality of points that represent a point cloud; representing a position of the point in each dimension of a three-dimensional space as a sequence of bits, where the position of the point is encoded according to a tree data structure; partitioning at least one of the sequences of bits into a first portion of bits and a second portion of bits; quantizing each of the second portions of bits according to a quantization step size, where the quantization step size is determined according to an exponential function having a quantization parameter value as an input and the quantization step size as an output; and generating a data structure representing the point cloud and including the quantized second portions of bits.

    In-tree geometry quantization of point clouds
    135.
    发明公开
    In-tree geometry quantization of point clouds 审中-公开

    公开(公告)号：US20240119641A1

    公开(公告)日：2024-04-11

    申请号：US18545966

    申请日：2023-12-19

    Applicant: Apple Inc.

    Inventor： David Flynn ,  Khaled Mammou ,  Fabrice A. Robinet

    IPC: G06T9/40 ,  G06T17/00

    CPC classification number: G06T9/40 ,  G06T17/005 ,  G06T2210/56

    Abstract: An example method includes receiving a plurality of points that represent a point cloud; representing a position of the point in each dimension of a three-dimensional space as a sequence of bits, where the position of the point is encoded according to a tree data structure; partitioning at least one of the sequences of bits into a first portion of bits and a second portion of bits; quantizing each of the second portions of bits according to a quantization step size, where the quantization step size is determined according to an exponential function having a quantization parameter value as an input and the quantization step size as an output; and generating a data structure representing the point cloud and including the quantized second portions of bits.

    Video-based point cloud compression with predicted patches
    138.
    发明授权
    Video-based point cloud compression with predicted patches 有权

    公开(公告)号：US11798196B2

    公开(公告)日：2023-10-24

    申请号：US17145205

    申请日：2021-01-08

    Applicant: Apple Inc.

    Inventor： Jungsun Kim ,  Khaled Mammou ,  Alexandros Tourapis

    IPC: G06T9/00 ,  G06T17/20 ,  G06T3/40

    CPC classification number: G06T9/001 ,  G06T3/40 ,  G06T17/20 ,  G06T2210/12

    Abstract: A system comprises an encoder configured to compress attribute information and/or spatial information for three-dimensional (3D) visual volumetric content and/or a decoder configured to decompress compressed attribute and/or spatial information for the 3D visual volumetric content. The encoder is configured to convert 3D visual volumetric content, such as a point cloud or mesh, into image based patch representations. The encoder is further configured to select one or more reference patches for copying or prediction, such that metadata for copying or predicting a patch based on the reference patch is signaled without explicitly signaling a full set of information for the copied or predicted patch. Likewise, a decoder is configured to receive such information and reconstruct a 3D version of the 3D visual volumetric content using both signaled and predicted or copied patches.

    REMESHING FOR EFFICIENT COMPRESSION
    139.
    发明公开
    REMESHING FOR EFFICIENT COMPRESSION 审中-公开

    公开(公告)号：US20230290009A1

    公开(公告)日：2023-09-14

    申请号：US18166154

    申请日：2023-02-08

    Applicant: Apple Inc.

    Inventor： Khaled Mammou ,  Alexandros Tourapis ,  Jungsun Kim

    IPC: G06T9/00 ,  G06T17/20

    CPC classification number: G06T9/001 ,  G06T17/205

    Abstract: A re-meshing pre-processor for re-meshing a 3D textured mesh M(i) to generate a base mesh m(i) and displacement field d(i) for input into a mesh encoder, can include a Mesh Decimation module that includes processing hardware that reduces the number of vertices or faces of input mesh M(i), or a mesh derived therefrom, while substantially preserving the shape of the input mesh M(i), thereby producing a decimated mesh dm(i) and a projected mesh P(i); and a Fitting Subdivision Surface module that includes processing hardware that processes the input mesh M(i), the decimated mesh dm(i) or a mesh derived therefrom, and the projected mesh P(i) to produce a base mesh m(i) and the displacement field d(i) for input into a mesh encoder.

    IMAGE/VIDEO-BASED MESH COMPRESSION
    140.
    发明公开
    IMAGE/VIDEO-BASED MESH COMPRESSION 审中-公开

    公开(公告)号：US20230290008A1

    公开(公告)日：2023-09-14

    申请号：US18166148

    申请日：2023-02-08

    Applicant: Apple Inc.

    Inventor： Khaled Mammou ,  Alexandros Tourapis ,  Jungsun Kim

    IPC: G06T9/00 ,  G06T17/20

    CPC classification number: G06T9/001 ,  G06T17/205

    Abstract: A method of compressing a 3D textured mesh M(i), the 3D textured mesh being defined by connectivity C(i), geometry G(i), texture coordinates T(i), and texture connectivity CT(i), wherein the mesh is associated with one or more 2D image attribute maps A(i) describing attributes associated with the mesh surface, can include pre-processing 3D textured mesh M(i) and attribute maps A(i) to generate a base mesh m(i) and displacement field d(i); and processing 3D textured mesh M(i), attribute maps A(i), base mesh m(i), and the displacement field d(i) to generate a compressed bitstream b(i).

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