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As much of the reading was based on educational and personal sites from the World Wide Web, several dominant sources must be acknowledged.
An extensive MATLAB tutorial from the University of Florida.
Daniel Rueckert's academic pages.
Derek Hill's abstracts and publications.
Technical Reports of Matthew Cairn.
Related research in the Technical University of Denmark.
Pages maintained by Paul Viola.
Publications and resources from Tim Cootes.
Computer Vision at Johns Hopkins University.
Computer Vision at the University of Wisconsin.