perceptual image hashing

[perrygeo]

This looks interesting, it might be worth checking out as it gives a single similarity metric that's theoretically insensitive to minor changes

http://bertolami.com/index.php?engine=blog&content=posts&detail=perceptual-hashing https://github.com/ramenhut/insight

[perrygeo]

Looks like there are much better implementations: namely (pHash)[http://www.phash.org/]

There are a few python bindings to it, haven't tried any of them but all seem decent:

• https://github.com/bunchesofdonald/photohash
• https://github.com/polachok/py-phash
• https://github.com/JohannesBuchner/imagehash

[perrygeo]

As discussed in chat, this might be useful but has the same problem as every comparison method - you need to manually select a threshold. Interesting to pursue if we've got time but closing for now.