Landmark Transfer with Minimal Graph

Séminaire du LIRIS par Hyewon Seo, CR CNRS, University of Strasbourg, France

On 05/07/2013 at 10:30 to 12:00. Amphi 501, Bât Blaise Pascal, INSA de Lyon
Informations contact : S. Servigne et G. Damiand. +33 (0)

We will present an efficient and robust algorithm for the  landmark transfer on 3D meshes that are approximately isometric. Given  one or more custom landmarks placed by the user on a source mesh, we  compute corresponding landmarks on a family of target meshes. The technique is useful when a user is interested in characterization and  reuse of application-specific landmarks on meshes of similar shape  (for example, meshes coming from the same class of objects).  Consequently, across a set of multiple meshes consistency is assured  among landmarks, regardless of landmark geometric distinctiveness. The  main advantage of the proposed method over existing approaches is its  low computation time. Differently from existing non-rigid registration  techniques, our method detects and uses a minimum number of geometric features that are necessary to accurately locate the user-defined  landmarks and avoids performing unnecessary full registration. In  addition, unlike previous techniques that assume strict consistency  with respect to geodesic distances, we adopt histograms of geodesic distance to define feature point coordinates, in order to handle the deviation of isometric deformation. This allows us to accurately  locate the landmarks with only a small number of feature points in proximity, from which we build what we call a minimal graph. We  demonstrate and evaluate the quality of transfer by our algorithm on a  number of Tosca data sets.