Abstract
Image registration is a problem that arises in many image processing applications whenever information from two or more scenes have to be aligned. In image registration the use of an adequate measure of alignment is a crucial issue. Current techniques are classified in two broad categories: area based and feature based. All methods include some similarity measure. In this paper a new measure that combines mutual information ideas, spatial information and feature characteristics, is proposed. Edge points are used as features, obtained from a Canny edge detector. Feature characteristics like location, edge strength and orientation are taken into account to compute a joint probability distribution of corresponding edge points in two images. Mutual information based on this function is minimized to find the best alignment parameters. The approach has been tested with a collection of portal images taken in real cancer treatment sessions, obtaining encouraging results.
Work partially supported by the Spanish Ministry of Science and Technology under Project TIC2003-06953, and by Fundació Caixa Castelló under project P1-1B2002-41.
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Álvarez, N.A., Sanchiz, J.M., Badenas, J., Pla, F., Casañ, G. (2005). Contour-Based Image Registration Using Mutual Information. In: Marques, J.S., Pérez de la Blanca, N., Pina, P. (eds) Pattern Recognition and Image Analysis. IbPRIA 2005. Lecture Notes in Computer Science, vol 3522. Springer, Berlin, Heidelberg. https://doi.org/10.1007/11492429_28
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DOI: https://doi.org/10.1007/11492429_28
Publisher Name: Springer, Berlin, Heidelberg
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