Three options for you. All command-line. I've never used the first two, and 
never tried your problem with the third...

http://pdiff.sourceforge.net/
is in the Fedora repos as PerceptualDiff. It looks like it will mostly 
compare two images together.

http://www.marengo-ltd.com/open_source/index.php
jpegdiff looks like it's just source code.

Imagemagick might be your tool:
http://www.imagemagick.org/Usage/compare/#metrics
the compare functions allow you to fingerprint images in different ways 
(similar to creating a hash code. You wind up with a value that 'describes' 
the image.) If you generate a couple of different values for each image, you 
should be able to make a simple database to lookup similar pictures 
(imagemagick states you would actually use it to eliminate different 
pictures, as getting the same fingerprints wouldn't prove the pictures were 
the same.)

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