Looks like it does all kinds of tricks at once -- histograms, SIFT/SURF features and edge patterns. I was looking for a simpler solution, like an effective MVP-

Looks like it does all kinds of tricks at once -- histograms, SIFT/SURF features and edge patterns. I was looking for a simpler solution, like an effective MVP-tree implementation for perceptual hashes. Wouldn't that be faster and overall better?