Comment by benrbray
4 years ago
Ah, I guess unsurprisingly the twitter thread is light on details. I saw "perceptual hash" which I usually interpret to mean some kind of feature-based semantic hash that is not as sensitive to small edits. Even if it isn't currently used, the door is open for it to be implemented in the future.
Perceptual hashing would make bit more sense. Flip one bit from the image to avoid detection otherwise.