Stable Topological Signatures for Points on 3D Shapes
Résumé
Comparing points on 3D shapes is among the fundamental operations in
shape analysis. To facilitate this task, a great number of local point
signatures or descriptors have been proposed in the past decades. However,
the vast majority of these descriptors concentrate on the local
geometry of the shape around the point, and thus are insensitive to
its connectivity structure. By contrast, several
\emph{global} signatures have been proposed that successfully
capture the overall topology of the shape and thus characterize the
shape as a whole. In this paper, we propose the first point
descriptor that captures the topology structure of the shape as
`seen' from a single point, in a multiscale and provably stable
way. We also demonstrate how a large class of topological
signatures, including ours, can be mapped to
vectors, opening the door to many classical analysis and learning
methods. We illustrate the performance of this approach on the
problems of supervised shape labeling and shape matching. We show that
our signatures provide complementary information to existing ones
and allow to achieve better performance with less training data
in both applications.
Domaines
Géométrie algorithmique [cs.CG]Origine | Fichiers produits par l'(les) auteur(s) |
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