Lv. Tsap et al., Model-based force-driven nonrigid motion recovery from sequences of range images without point correspondences, IMAGE VIS C, 17(14), 1999, pp. 997-1007
In this article we propose a new method for accurate nonrigid motion analys
is when point correspondence data is not available. Nonlinear finite elemen
t models are constructed by integrating range data and prior knowledge abou
t an object's properties. The motion sequence is recovered given an initial
alignment of the model with the first frame of the sequence. The main idea
of the method is to find the forces that are responsible for the motion or
shape deformation of the given object. The task is broken into subtasks of
finding the forces for each frame. Both absolute values and directions of
these forces are taken into consideration and iteratively varied not only f
or each frame, but also between the frames. Experimental results demonstrat
e the success of the proposed algorithm. The method is applied to man-made
elastic materials and human hand modeling. It allows for recovery of single
and multiple forces using restricted (elastic-articulated) and completely
unrestricted (elastic) models. Our work demonstrates the possibility of acc
urate nonrigid motion analysis and force recovery from range image sequence
s containing nonrigid objects and large motion without interframe point cor
respondences. (C) 1999 Elsevier Science B.V. All rights reserved.