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|Title:||Robust trajectory-space TV-L1 optical flow for non-rigid sequences|
|Citation:||Energy Minimization Methods in Computer Vision and Pattern Recognition,: proceedings 8th International Conference, EMMCVPR 2011, 2011 / Boykov, Y., Kahl, F., Lempitsky, V., Schmidt, F. (ed./s), pp.300-314|
|Series/Report no.:||Lecture Notes in Computer Science; 6819|
|Conference Name:||8th International Conference on Energy Minimization Methods in Computer Vision and Pattern Recognition (EMMCVPR 2011) (25 Jul 2011 - 27 Jul 2011 : St. Petersburg, Russia)|
|Ravi Garg, Anastasios Roussos, and Lourdes Agapito|
|Abstract:||This paper deals with the problem of computing optical flow between each of the images in a sequence and a reference frame when the camera is viewing a non-rigid object. We exploit the high correlation between 2D trajectories of different points on the same non-rigid surface by assuming that the displacement sequence of any point can be expressed in a compact way as a linear combination of a low-rank motion basis. This subspace constraint effectively acts as a long term regularization leading to temporally consistent optical flow. We formulate it as a robust soft constraint within a variational framework by penalizing flow fields that lie outside the low-rank manifold. The resulting energy functional includes a quadratic relaxation term that allows to decouple the optimization of the brightness constancy and spatial regularization terms, leading to an efficient optimization scheme. We provide a new benchmark dataset, based on motion capture data of a flag waving in the wind, with dense ground truth optical flow for evaluation of multi-view optical flow of non-rigid surfaces. Our experiments, show that our proposed approach provides comparable or superior results to state of the art optical flow and dense non-rigid registration algorithms.|
|Rights:||© Springer-Verlag Berlin Heidelberg 2011|
|Appears in Collections:||Computer Science publications|
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