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International Workshop on Energy Minimization Methods in Computer Vision and Pattern Recognition

EMMCVPR 2009: Energy Minimization Methods in Computer Vision and Pattern Recognition pp 288–302Cite as

Geodesics in Shape Space via Variational Time Discretization

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Part of the book series: Lecture Notes in Computer Science ((LNIP,volume 5681))

Abstract

A variational approach to defining geodesics in the space of implicitly described shapes is introduced in this paper. The proposed framework is based on the time discretization of a geodesic path as a sequence of pairwise matching problems, which is strictly invariant with respect to rigid body motions and ensures a 1-1 property of the induced flow in shape space. For decreasing time step size, the proposed model leads to the minimization of the actual geodesic length, where the Hessian of the pairwise matching energy reflects the chosen Riemannian metric on the shape space. Considering shapes as boundary contours, the proposed shape metric is identical to a physical dissipation in a viscous fluid model of optimal transportation. If the pairwise shape correspondence is replaced by the volume of the shape mismatch as a penalty functional, for decreasing time step size one obtains an additional optical flow term controlling the transport of the shape by the underlying motion field. The implementation of the proposed approach is based on a level set representation of shapes, which allows topological transitions along the geodesic path. For the spatial discretization a finite element approximation is employed both for the pairwise deformations and for the level set representation. The numerical relaxation of the energy is performed via an efficient multi–scale procedure in space and time. Examples for 2D and 3D shapes underline the effectiveness and robustness of the proposed approach.

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Author information

Authors and Affiliations

  1. Institute for Numerical Simulation, University of Bonn, Germany

    Benedikt Wirth & Martin Rumpf

  2. Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, U.S.A.

    Leah Bar & Guillermo Sapiro

Authors
  1. Benedikt Wirth
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  2. Leah Bar
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  3. Martin Rumpf
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  4. Guillermo Sapiro
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Editor information

Editors and Affiliations

  1. Institut für Informatik III, Rö, Universität Bonn, merstraße 164, 53117, Bonn, Germany

    Daniel Cremers

  2. Computer Science Department, University of Western Ontario, N6A 5A5, London, ON, Canada

    Yuri Boykov

  3. Microsoft Research, J.J. Thomson Avenue, CB3 OFB, Cambridge, United Kingdom

    Andrew Blake

  4. Institut für Informatik III, Universität Bonn, Römerstraße 164, 53117, Bonn, Germany

    Frank R. Schmidt

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© 2009 Springer-Verlag Berlin Heidelberg

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Wirth, B., Bar, L., Rumpf, M., Sapiro, G. (2009). Geodesics in Shape Space via Variational Time Discretization. In: Cremers, D., Boykov, Y., Blake, A., Schmidt, F.R. (eds) Energy Minimization Methods in Computer Vision and Pattern Recognition. EMMCVPR 2009. Lecture Notes in Computer Science, vol 5681. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-03641-5_22

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  • DOI: https://doi.org/10.1007/978-3-642-03641-5_22

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-03640-8

  • Online ISBN: 978-3-642-03641-5

  • eBook Packages: Computer ScienceComputer Science (R0)

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