I thought that similar inputs do not give similar hashes..but apparently that is cryptographic hashing. Locality-Sensitive Hashing methods (e.g. Perceptual hashing[1]) makes similar inputs have similar hashes.
I immediately did a little exploration for potential utility in neuroimaging analyses...not that anything was immediately obvious to me, but I love learning about things like this.
I should have been more specific in my comment. Perceptual hashing allowsfor higher similarity scores between similar looking images.
Lots of cool techniques to experiment with. Highly recommend playing around if you’re interested.