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- W2056120639 abstract "© 2014. The copyright of this document resides with its authors. This paper describes a sequential solution to dense non-rigid structure from motion that recovers the camera motion and 3D shape of non-rigid objects by processing a monocular image sequence as the data arrives. We propose to model the time-varying shape with a probabilistic linear subspace of mode shapes obtained from continuum mechanics. To efficiently encode the deformations of dense 3D shapes that contain a large number of mesh vertexes, we propose to compute the deformation modes on a down sampled rest shape using finite element modal analysis at a low computational cost. This sparse shape basis is then grown back to dense exploiting the shape functions within a finite element. With this probabilistic low-rank constraint, we estimate camera pose and non-rigid shape in each frame using expectation maximization over a sliding window of frames. Since the time-varying weights are marginalized out, our approach only estimates a small number of parameters per frame, and hence can potentially run in real time. We evaluate our algorithm on both synthetic and real sequences with 3D ground truth data for different objects ranging from inextensible to extensible deformations and from sparse to dense shapes. We show the advantages of our approach with respect to competing sequential methods." @default.
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- W2056120639 date "2014-01-01" @default.
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- W2056120639 title "Online Dense Non-Rigid 3D Shape and Camera Motion Recovery" @default.
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