Finding Point Correspondences in Motion Sequences Preserving Affine Structure
G. Sudhir, Subhashis Banerjee, Andrew Zisserman · 1993
In this paper the problem of computing the point correspondences in a sequence of time-varying images of a 3D object undergoing non-rigid (aÆne) motion is addressed. It is assumed that the images are obtained through aÆne projections. The correspondences are established only from the analysis of the unknown 3D aÆne structure of the object, without making use of any attributes of the feature points. It is shown that it is possible to establish the point correspondences uniquely (up to symmetry) in the sense that they yield a unique aÆne structure of the object and that the computation is possible in polynomial time. Two dierent algorithms for computing the point correspondences are presented. Results on various real image sequences, including a sequence containing independently moving objects, demonstrate the applicability of the structure based approach to motion correspondence. Dept. Computer Science, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong K...