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Is it possible to hash an image so that you can partially match it with subsets of that image (like cropped regions or resizes)? Or a slight modification of th
by lifeformed 13y ago
Is it possible to hash an image so that you can partially match it with subsets of that image (like cropped regions or resizes)? Or a slight modification of that image (colors shifted, image flipped, etc).
- russellsprouts 13y agoI believe so. Tineye uses something similar, because it detects those matches.
- gwern 13y agoYep. Google "perceptual hash functions".
- krapp 13y agoshameless self-promotion - I wrote a perceptual hasher for PHP : https://github.com/kennethrapp/phasher https://github.com/kennethrapp/phasher FWIW the biggest problem with this is false positives, though admittedly I may just not be clever enough to do it with enough finesse.