How to define a locally adaptive sampling criterion for topologically correct reconstruction of multiple regions

  • Authors:
  • Leonid Tcherniavski;Christian BäHnisch;Hans Meine;Peer Stelldinger

  • Affiliations:
  • University of Hamburg, Germany;University of Hamburg, Germany;Fraunhofer MEVIS, Bremen, Germany;International Computer Science Institute, Berkeley, USA

  • Venue:
  • Pattern Recognition Letters
  • Year:
  • 2012

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Abstract

Volume-based boundary reconstruction processes often have to deal with non-manifold shapes. Even though many reconstruction algorithms have been proposed for non-manifold surfaces, they usually do not preserve topological properties. Only recently, methods were presented which-given a finite set of surface sample points-result in a mesh representation of the original boundary preserving all or certain neighborhood relations, even if the sampling is sparse and highly noise corrupted. We show that the required sampling conditions of the algorithm called ''refinement reduction'' limit the guaranteed correctness of the outcome to a small class of shapes. We define new locally adaptive sampling conditions that depend on our new pruned medial axis and finally prove without any restriction on shapes that under these new conditions, the result of ''refinement reduction'' corresponds to a refinement of a topologically correct mesh in cases where the previous sampling criteria failed. Based on our results we propose a new criterion for locally adaptive point set decimation. We also discuss why our sampling conditions can only lead to a refinement of a correct reconstruction but not necessarily to a correct reconstruction itself.