公开(公告)号：US20190197775A1

公开(公告)日：2019-06-27

申请号：US16230841

申请日：2018-12-21

Applicant: Dassault Systemes

Inventor： Fernando Manuel SANCHEZ BERMUDEZ ,  Mourad BOUFARGUINE ,  Guillaume RANDON

IPC: G06T17/20

Abstract: The disclosure notably relates to a computer-implemented method for 3D reconstruction. The method comprises providing a 3D point cloud representing a real object. The method also comprises fitting the 3D point cloud with parametric surfaces. The method also comprises defining a partition of the parametric surfaces into oriented facets which respect intersections between the parametric surfaces. The method also comprises determining, among the oriented facets of the partition, a set of facets that represents a skin of the real object. The determining comprises minimizing an energy. The energy includes a data term and a constraint term. The data term increasingly penalizes discarding facets, as a level of fit between a discarded facet and the 3D point cloud increases. The constraint term penalizes formation of non-skin geometry by kept facets. Such a method provides an improved solution for 3D reconstruction.

公开(公告)号：US20210157961A1

公开(公告)日：2021-05-27

申请号：US17102254

申请日：2020-11-23

Applicant: DASSAULT SYSTEMES

Inventor： Guillaume RANDON ,  Eloi MEHR

IPC: G06F30/23 ,  G06F30/27 ,  G06F30/12 ,  G06T17/20 ,  G06N3/08

Abstract: A method for processing a shape attribute 3D signal including providing a graph having nodes and arcs, each node representing a point of a 3D discrete representation, each arc representing neighboring points of the representation, providing a set of values representing a distribution of the shape attribute, each value being associated to a node and representing the shape attribute at the point represented by the node, minimizing energy on a Markov Random Field on the graph, the energy penalizing, for each arc connecting a first node associated to a first value to a second node associated to a second value, highness of an increasing function of a distance between the first and second value, a distance between a first point, represented by the first node, and a medial geometrical element of the representation, and a distance between a second point, represented by the second node, and the medial geometrical element.

公开(公告)号：US20200211279A1

公开(公告)日：2020-07-02

申请号：US16730795

申请日：2019-12-30

Applicant: DASSAULT SYSTEMES

Inventor： Guillaume RANDON ,  Serban Alexandru STATE ,  Fernando Manuel SANCHEZ BERMUDEZ

IPC: G06T17/10

Abstract: The disclosure notably relates to a computer-implemented method for generating a structured three-dimensional (3D) model from a mesh. The method includes obtaining a mesh that comprises faces, each face of the mesh including a normal and principal curvature values; computing a distribution of the principal curvatures values over the whole mesh by counting the number of occurrences of discretized curvature values; identifying in the computed distribution one or more dominant ranges of principal curvature values; for each identified dominant range, computing one or more regions of the mesh that includes faces belonging to the identified dominant range; for each computed region, detecting a primitive type by using the curvatures values of all faces of the region and identifying parameters of the detected primitive by using the mesh surface of the region.