Estimation of Multiple Objects at Unknown Locations with Active Contours

Authors:
Margarida Silveira;Jorge S. Marques
Affiliations:
IST - Instituto Superior Técnico, Technical University of Lisbon and ISR - Instituto de Sistemas e Robótica, Portugal;IST - Instituto Superior Técnico, Technical University of Lisbon and ISR - Instituto de Sistemas e Robótica, Portugal
Venue:
IbPRIA '07 Proceedings of the 3rd Iberian conference on Pattern Recognition and Image Analysis, Part II
Year:
2007

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Abstract

This paper presents an algorithm for the estimation of multiple regions with unknown shapes and positions using multiple active contour models (ACM's). The algorithm organizes edge points into strokes and computes the association between those strokes and the ACM's using the component wise EM algorithm (CEM) for MAP estimation. The algorithm is randomly initialized with a high number of ACM's and performs online model selection using importance sampling. Experimental results show the effectiveness of the proposed technique.