METHOD FOR WATERMARKING A THREE DIMENSIONAL OBJECT

摘要

A method for watermarking a three-dimensional object is disclosed wherein the three-dimensional object is represented by a mesh and a mesh comprises a plurality of vertices. The method comprises determining an original histogram of distances for said mesh, wherein a distance is computed between a barycenter of said mesh and a vertex of said mesh; modifying positions of a plurality of vertices of the mesh such that an histogram of distances for said modified mesh reaches a target histogram, said target histogram being a function of a watermark payload and of the original histogram of distances, wherein modifying the positions of said plurality of vertices comprises modifying the position of at least one vertex along a direction distinct from the direction defined by said vertex to the barycenter such that a distortion constraint between said mesh and said modified mesh is satisfied and such that a distortion constraint between said barycenter and a barycenter of said modified mesh is satisfied. A method for detecting a watermark in a three-dimensional object, devices for implementing the methods and a watermarked object are further disclosed.

主权项

1. A method for watermarking a three-dimensional object, wherein said three-dimensional object is represented by a mesh, said mesh comprising a plurality of vertices, said method comprising:
Determining an original histogram of distances for said mesh, wherein a distance is computed between a barycenter of said mesh and a vertex of said mesh; Modifying positions of a plurality of vertices of the mesh such that an histogram of distances for said modified mesh reaches a target histogram, said target histogram being a function of a watermark payload and of the original histogram of distances; wherein modifying the positions of said plurality of vertices, comprises modifying the position of at least one vertex along a direction distinct from the direction defined by said vertex to the barycenter such that a distortion constraint between said mesh and said modified mesh is satisfied and a distortion constraint between said barycenter and a barycenter of said modified mesh is satisfied.