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Re: Comparing two images

Subject: Re: Comparing two images
From: Elliott Hughes <email@hidden>
Date: Sun, 10 Apr 2005 12:28:05 -0700
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From: Scott Ellsworth <email@hidden>

A friend just asked how one would scan approximately 40k images for
duplicates..  Anyone able to recommend a Java toolkit for same that
works with reasonable speed on the Mac?

This is a terribly complicated problem to do right, but I wanted to
try an "off the cuff" fast solution first.  Something perhaps a bit
more clever than a straight checksum of the image data, like a color
histogram.  This would let us decide whether something smart that
actually analyzes the images is a good idea.

comparing (checksum, file size) worked pretty well for me. keeping a serialized form of the library's information made incremental addition very fast.

obviously, if you could have the same image data with different metadata, this is no use. even then, i'd probably still start with the same technique on just the image data.

i'd be interested to hear about other techniques that people have actually tried and know to work, though.

--
Elliott Hughes, http://www.jessies.org/~enh/

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