Is there such thing as a 'soft checksum' tool?
vogelke+unix at pobox.com
Sun Sep 6 01:21:41 UTC 2009
>> On Sat, 5 Sep 2009 10:33:03 -0600,
>> Modulok <modulok at gmail.com> said:
M> I'm looking for a pseudo-checksum tool for use with cataloging images.
M> For example, a strict checksum algorithm, like the sha family, will
M> produce a dramatically different checksum for two files which differ by
M> only a single bit. I'm looking for something where two images, which
M> are similar, get a proportionally similar checksum.
This works pretty well with text, but I don't know about images.
What's a nilsimsa code?
A nilsimsa code is something like a hash, but unlike hashes, a small
change in the message results in a small change in the nilsimsa code.
Such a function is called a locality-sensitive hash.
Karl Vogel I don't speak for the USAF or my company
Garlic gum is not funny. --written on blackboard by Bart Simpson
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