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I think imgseek would really do a good job, but if you want to have another point of view on wavelet programs to find dupes, here is one in delphi : http://www.delphifr.com/codes/RECHERCHE-SUPPRESSION-IMAGES-DOUBLE-BASEE-SUR-COMPARAISON-INTELLIGENTE_38711.aspx
the comments are in french but I think a translation tool is sufficient to understand what the author and forumers say.
May it help you.