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Proceedings Paper

Closed-form solutions for polygon-based node motion estimation
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Paper Abstract

Motion compensation using 2-D mesh models requires computation of the parameters of a spatial transformation within each mesh element (patch). It is well known that the parameters of an affine (bilinear or perspective) mapping can be uniquely estimated from three (four) node-point motion estimates. This paper presents closed-form overdetermined solutions for least squares estimation of the motion parameters, which also preserve mesh-connectivity using node-based connectivity constraints. In particular, two new algorithms are presented: The first method, based on the dense motion estimates, can be viewed as post processing of the dense motion field for best compact representation in terms of irregularly spaced samples, while the second one, which is based on spatio-temporal intensity gradients, offers closed- form solutions for direct estimation of the best node-point motion vectors. We show that the performance of the proposed closed-form solutions are comparable to those of the alternative search-based solutions at a fraction of the computational cost.

Paper Details

Date Published: 27 February 1996
PDF: 12 pages
Proc. SPIE 2727, Visual Communications and Image Processing '96, (27 February 1996); doi: 10.1117/12.233250
Show Author Affiliations
Yucel Altunbasak, Univ. of Rochester (United States)
A. Murat Tekalp, Univ. of Rochester (United States)

Published in SPIE Proceedings Vol. 2727:
Visual Communications and Image Processing '96
Rashid Ansari; Mark J. T. Smith, Editor(s)

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