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    TASK-ORIENTED DYNAMIC MESH COMPRESSION USING OCCUPANCY NETWORKS
    2.
    发明申请
    TASK-ORIENTED DYNAMIC MESH COMPRESSION USING OCCUPANCY NETWORKS 有权

    公开(公告)号：US20230016302A1

    公开(公告)日：2023-01-19

    申请号：US17861033

    申请日：2022-07-08

    Applicant: SONY GROUP CORPORATION ,  Sony Corporation of America

    Inventor： Alexandre Zaghetto ,  Danillo Graziosi ,  Ali Tabatabai

    IPC: G06T9/00

    Abstract: Methods, systems and device for efficiently compressing task-oriented dynamic meshes using occupancy networks are described herein. A single trained occupancy network model is able to reconstruct a mesh video using a few additional points per input mesh frame. To optimize the compression of the model and points, the estimated rate to compress the occupancy network is able to be included in the loss function. This minimizes the number of bits to encode the model, while it tries to reproduce the meshes as well as possible. An adaptive subsampling per input mesh is added to optimize the mesh reconstruction and the N-point point clouds compression. To optimize the model to perform a particular task, a metric is added to the cost function that takes this task into account.

    Adaptive sub-band based coding of hierarchical transform coefficients of three-dimensional point cloud
    4.
    发明授权
    Adaptive sub-band based coding of hierarchical transform coefficients of three-dimensional point cloud 有权

    公开(公告)号：US10964102B2

    公开(公告)日：2021-03-30

    申请号：US16423940

    申请日：2019-05-28

    Applicant: SONY CORPORATION

    Inventor： Arash Vosoughi ,  Danillo Graziosi

    IPC: G06T17/00 ,  G06T9/00 ,  G06T7/37 ,  G06K9/62

    Abstract: An electronic apparatus and method for adaptive sub-band based coding of hierarchical transform coefficients of a 3D point cloud, is provided. The electronic apparatus stores the 3D point cloud and generates a plurality of voxels from the 3D point cloud. The electronic apparatus generates a plurality of hierarchical transform coefficients by application of a hierarchical transform scheme on the generated plurality of voxels and classifies the plurality of hierarchical transform coefficients into a plurality of sub-bands of hierarchical transform coefficients. The plurality of hierarchical transform coefficients are classified based on a weight of each of the plurality of hierarchical transform coefficients. The electronic apparatus further generates a plurality of quantized levels by application of a different quantization scheme of a set of different quantization schemes on each sub-band of hierarchical transform coefficients of the plurality of sub-bands of hierarchical transform coefficients and encodes the generated plurality of quantized levels.

    RATE DISTORTION OPTIMIZATION FOR ADAPTIVE SUBBAND CODING OF REGIONAL ADAPTIVE HAAR TRANSFORM (RAHT)
    5.
    发明申请
    RATE DISTORTION OPTIMIZATION FOR ADAPTIVE SUBBAND CODING OF REGIONAL ADAPTIVE HAAR TRANSFORM (RAHT) 审中-公开

    公开(公告)号：US20200090374A1

    公开(公告)日：2020-03-19

    申请号：US16266340

    申请日：2019-02-04

    Applicant: SONY CORPORATION

    Inventor： Danillo Graziosi ,  Arash Vosoughi

    IPC: G06T9/40 ,  G06T19/20

    Abstract: A method for rate distortion optimization for adaptive sub-band coding of Region-Adaptive Hierarchical Transform (RAHT) coefficients, which is a point cloud color compression method adopted in PCC test model TMC13 for compression of CAT1 sequences is described herein. Based on Lagrangian optimization, the method estimates the coefficient distortion by using the compressed mesh geometry as reference. The Lagrange factor is calculated based on the quantization parameters, and the results show that the parameters obtained automatically have similar or better performance than parameters chosen after an extensive search.

    MESH SEGMENTATION
    7.
    发明申请
    MESH SEGMENTATION 有权

    公开(公告)号：US20250022179A1

    公开(公告)日：2025-01-16

    申请号：US18394062

    申请日：2023-12-22

    Applicant: Sony Group Corporation ,  Sony Corporation of America

    Inventor： Danillo Graziosi ,  Alexandre Zaghetto ,  Ali Tabatabai

    IPC: G06T9/00 ,  G06F18/2431 ,  G06T7/11 ,  G06T7/187 ,  G06T17/20

    Abstract: Described herein is a method to segment meshes into sub-meshes based on triangle properties. The triangles are first classified according to some characteristic using their respective areas. A filtering process may change the classification according to the neighboring triangles. Then connected components are generated, and neighboring connected components are merged following a certain criteria. In some embodiments, connected components that share the most amount of edges are merged. With this technique, sub-meshes can be automatically generated without any previous knowledge of the mesh generation stage.

    MESH PATCH SYNTAX
    8.
    发明公开
    MESH PATCH SYNTAX 审中-公开

    公开(公告)号：US20230306644A1

    公开(公告)日：2023-09-28

    申请号：US17987848

    申请日：2022-11-15

    Applicant: SONY GROUP CORPORATION ,  Sony Corporation of America

    Inventor： Danillo Graziosi ,  Alexandre Zaghetto ,  Ali Tabatabai

    IPC: G06T9/00 ,  G06T17/20

    CPC classification number: G06T9/001 ,  G06T17/20

    Abstract: New syntax elements are used to extend patch types, and the syntax is added to the V3C standard. The new syntax defines patches that encode meshes by projecting connected triangles to a 2D surface, patches that encode triangles or triangle strips without any projection, or patches that are tracked over time and are encoded by projecting connected triangles to a 2D surface. Furthermore, the syntax allows for different ways of coding the mesh-specific information. For instance, the syntax enables three different encoding methods for the vertex position: explicit (directly added to the atlas stream), embedded on video data (occupancy map data), or encoded using an external mesh encoder.

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