perceptual image hashing
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Let’s say want to compare two pictures to see if they look the same. Perceptual image hashing is how you do that. It’s impossible to just look at them and say “they are identical” with 100% certainty so that’s where perceptual image hashing comes in.
Perceptual image hashing is kind of a shortcut for comparing pictures. It’s like making a special code for each picture, called the hash which cna be SHA256 or similar depending on the complexity you want. You can then compare the codes to see if they match up. If the codes match, it’s a good sign that the pictures are the same. If the codes are different, it means the are almost certainly different in some way.
Perceptual image hashing is used a lot in things like finding duplicates of pictures online, or making sure that someone hasn’t copied an image and tried to pass it off as their own.
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