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    Video-Based Point Cloud Compression with Variable Patch Scaling
    72.
    发明申请
    Video-Based Point Cloud Compression with Variable Patch Scaling 有权

    公开(公告)号：US20210211724A1

    公开(公告)日：2021-07-08

    申请号：US17145192

    申请日：2021-01-08

    Applicant: Apple Inc.

    Inventor： Jungsun Kim ,  Khaled Mammou ,  Alexandros Tourapis

    IPC: H04N19/597 ,  H04N19/46 ,  H04N19/30 ,  H04N19/124

    Abstract: A system comprises an encoder configured to compress attribute information and/or spatial information for volumetric visual content and/or a decoder configured to decompress compressed attribute and/or spatial information for the volumetric visual content. The encoder is configured to convert a 3D representation of the visual volumetric content into a 2D image based representation. The encoder is further configured to scale the patch in 2D space independent of any scaling in 3D space. Auxiliary information is signaled for use in identifying 2D scaled or unscaled patches in an image frame, mapping the patches into 3D space, and adjusting for any scaling factors applied at the encoder.

    Point cloud compression with adaptive filtering
    73.
    发明授权
    Point cloud compression with adaptive filtering 有权

    公开(公告)号：US11017566B1

    公开(公告)日：2021-05-25

    申请号：US16459483

    申请日：2019-07-01

    Applicant: Apple Inc.

    Inventor： Alexandros Tourapis ,  Khaled Mammou ,  Yeping Su ,  Jungsun Kim ,  Valery G. Valentin ,  David W. Singer ,  Fabrice A. Robinet ,  Hsi-Jung Wu

    IPC: G06T9/00 ,  G06T3/40 ,  H03M7/30 ,  G06T17/20

    Abstract: A system comprises an encoder configured to compress attribute information and/or spatial for a point cloud and/or a decoder configured to decompress compressed attribute and/or spatial information for the point cloud. To compress the attribute and/or spatial information, the encoder is configured to convert a point cloud into an image based representation. Also, the decoder is configured to generate a decompressed point cloud based on an image based representation of a point cloud. A processing/filtering element utilizes occupancy map information and/or auxiliary patch information to determine relationships between patches in image frames and adjusts encoding/decoding and/or filtering or pre/post-processing parameters based on the determined relationships.

    Video-Based Point Cloud Compression with Non-Normative Smoothing
    74.
    发明申请
    Video-Based Point Cloud Compression with Non-Normative Smoothing 有权

    公开(公告)号：US20210099701A1

    公开(公告)日：2021-04-01

    申请号：US17031792

    申请日：2020-09-24

    Applicant: Apple Inc.

    Inventor： Alexandros Tourapis ,  Jungsun Kim ,  Khaled Mammou ,  Dominik Mehlem

    IPC: H04N19/117 ,  H04N19/60 ,  H04N19/80 ,  H04N19/136 ,  H04N19/12 ,  H04N19/172 ,  H04N19/184

    Abstract: A system comprises an encoder configured to compress attribute and/or spatial information for a point cloud and/or a decoder configured to decompress compressed attribute and/or spatial information for the point cloud. To compress the attribute and/or spatial information, the encoder is configured to convert a point cloud into an image based representation. Also, the decoder is configured to generate a decompressed point cloud based on an image based representation of a point cloud. In some embodiments, an encoder applies an attribute transfer function to attributes of an image based representation with out-of-loop smoothing such that a decoder may apply any smoothing filter supported by the decoder without being restricted to using a similar smoothing filter as the encoder.

    POINT CLOUD COMPRESSION USING VIDEO ENCODING WITH TIME CONSISTENT PATCHES
    75.
    发明申请
    POINT CLOUD COMPRESSION USING VIDEO ENCODING WITH TIME CONSISTENT PATCHES 有权

    公开(公告)号：US20210097723A1

    公开(公告)日：2021-04-01

    申请号：US17031787

    申请日：2020-09-24

    Applicant: Apple Inc.

    Inventor： Jungsun Kim ,  Alexandros Tourapis ,  Khaled Mammou ,  Chao Cao ,  Marius Preda

    IPC: G06T9/00 ,  G06T5/00 ,  G06T7/73 ,  H04N19/137 ,  H04N19/60 ,  H04N19/80 ,  H04N19/172

    Abstract: A system comprises an encoder configured to compress attribute and/or spatial information for a point cloud and/or a decoder configured to decompress compressed attribute and/or spatial information for the point cloud. To compress the attribute and/or spatial information, the encoder is configured to convert a point cloud into an image based representation. Also, the decoder is configured to generate a decompressed point cloud based on an image based representation of a point cloud. In some embodiments, an encoder generates time-consistent patches for multiple version of the point cloud at multiple moments in time and uses the time-consistent patches to generate image based representations of the point cloud at the multiple moments in time.

    Point cloud compression using fixed-point numbers
    76.
    发明授权
    Point cloud compression using fixed-point numbers 有权

    公开(公告)号：US10853973B2

    公开(公告)日：2020-12-01

    申请号：US16592711

    申请日：2019-10-03

    Applicant: Apple Inc.

    Inventor： Alexandros Tourapis ,  Valery G. Valentin ,  Fabrice A. Robinet ,  Khaled Mammou ,  Jungsun Kim ,  Yeping Su

    IPC: G06T9/00

    Abstract: A system comprises an encoder configured to compress attribute information for a point cloud and/or a decoder configured to decompress compressed attribute information. Attribute values for at least one starting point are included in a compressed attribute information file and attribute correction values are included in the compressed attribute information file. Attribute values are predicted based, at least in part, on attribute values of neighboring points. The predicted attribute values are compared to attribute values of a point cloud prior to compression to determine attribute correction values. In order to improve computing efficiency and/or repeatability, fixed-point number representations are used when determining predicted attribute values and attribute correction values. A decoder follows a similar prediction process as an encoder and corrects predicted values using attribute correction values included in a compressed attribute information file using fixed-point number representations.

    Mesh Compression with Base Mesh Information Signaled in a First Sub-Bitstream and Sub-Mesh Information Signaled with Displacement Information in an Additional Sub-Bitstream
    79.
    发明申请
    Mesh Compression with Base Mesh Information Signaled in a First Sub-Bitstream and Sub-Mesh Information Signaled with Displacement Information in an Additional Sub-Bitstream 有权

    公开(公告)号：US20250117965A1

    公开(公告)日：2025-04-10

    申请号：US18908679

    申请日：2024-10-07

    Applicant: Apple Inc.

    Inventor： Jungsun Kim ,  Alexandros Tourapis

    IPC: G06T9/00 ,  H04N19/70

    Abstract: A system comprises an encoder configured to compress and encode data for a three-dimensional dynamic mesh. The three-dimensional dynamic mesh is compressed and signaled using a base-mesh sub-bitstream and an atlas sub-bitstream (e.g., displacement and/or attribute sub-bitstream). The atlas sub-bitstream comprises displacement information to be applied at sub-division points of the base mesh to recreate the three-dimensional dynamic mesh at a given moment in time and may also include attribute values, such as colors, textures, etc. to be applied to the reconstructed mesh. Sub-mesh identifiers are included in tile headers of an atlas sub-bitstream that enable selective reconstruction of sub-meshes. A complimentary decoder decodes a compressed bitstream for the three-dimensional dynamic mesh, encoded such as by the encoder.

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