Non-rigid Structure-from-Motion (NRSfM) is an active research eld in computer
vision. The task of NRSfM is to simultaneously recover camera motion and 3D
structure from 2D tracks of a deformable object. This problem is generally categorized
into sparse and dense cases in terms of scale, where sparse NRSfM deals with
a few feature tracks and dense NRSfM recovers the 3D position of each pixel in
ow. As NRSfM is essentially an under-constrained problem, recent research
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