Highly Accurate Optic Flow Computation with Theoretically Justified Warping |
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Authors: | Nils Papenberg Andrés Bruhn Thomas Brox Stephan Didas Joachim Weickert |
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Affiliation: | (1) Institute for Mathematics, University of Lübeck, Wallstrasse 40, 23560 Lübeck, Germany;(2) Mathematical Image Analysis Group, Faculty of Mathematics and Computer Science, Saarland University, Building 27, 66041 Saarbrücken, Germany |
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Abstract: | In this paper, we suggest a variational model for optic flow computation based on non-linearised and higher order constancy
assumptions. Besides the common grey value constancy assumption, also gradient constancy, as well as the constancy of the
Hessian and the Laplacian are proposed. Since the model strictly refrains from a linearisation of these assumptions, it is
also capable to deal with large displacements. For the minimisation of the rather complex energy functional, we present an
efficient numerical scheme employing two nested fixed point iterations. Following a coarse-to-fine strategy it turns out that
there is a theoretical foundation of so-called warping techniques hitherto justified only on an experimental basis. Since
our algorithm consists of the integration of various concepts, ranging from different constancy assumptions to numerical implementation
issues, a detailed account of the effect of each of these concepts is included in the experimental section. The superior performance
of the proposed method shows up by significantly smaller estimation errors when compared to previous techniques. Further experiments
also confirm excellent robustness under noise and insensitivity to parameter variations. |
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Keywords: | optical flow differential methods gradient constancy warping performance evaluation |
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