Fastest way to compute a "Visual" checksum of an image

Posted by ensnare on Stack Overflow See other posts from Stack Overflow or by ensnare
Published on 2010-03-29T22:30:54Z Indexed on 2010/03/29 22:33 UTC
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Filed under:

imagemagick

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image-processing

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images

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unique-key

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checksum

I'm looking to create an ID system for cataloging images. I can't use md5() since that will change if I alter the EXIF tags of the image.

I am currently using the SHA1 checksum computed by imagemagick. It works perfectly, but it's really, really slow on larger images (~15 seconds on a quad-core xeon for a 21 megapixel JPG).

Are there any other "visual" methods of uniquely identifying an image that would be faster?

Thank you.

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