defishing an image

Open source software: Hugin/Nona

http://www.pentaxforums.com/forums/pentax-slr-lens-discussion/33634-how-do-you-de-fish.html

http://wiki.panotools.org/Hugin

http://www.flickr.com/groups/67669253@N00/discuss/72157594344672391/

http://sourceforge.net/projects/hugin/files/hugin/

http://www.pbase.com/troyz/defishing_examples