comparing 2 images

[Fredrik Lundh]

Joe Green wrote:

> I would like to take 2 images (scanned) and compare them to see if
> they are similar. An example (but not limited to), would be 2
> signatures.
>
> What would be the most suitable library/module to use for this (if
> any). I have been looking through the PIL documentation (yet to look
> into ImageMagick). Am I knocking down the wrong doors? Is this even
> do-able in Python (I need to maintain portability)?

ed c jones' geohash package contains PIL/NumPy-based code to
extract features from images, and find matches in large databases:

    http://members.tripod.com/~edcjones/pycode.html

> Any hints/guides/references would also be greatly appreciated.

start here:

    http://citeseer.nj.nec.com/cs

(search for "compare images", "comparing images", "compare signatures",
"comparing signatures", "extract image features" etc and start reading)

</F>