The Problem with Perceptual Hashes
The Problem with Perceptual Hashes Apple just announced that they will use “perceptual hashing” to detect illegal photos on iPhones. I have some experience to share on this technology. At my company, we use “perceptual hashes” to find copies of an image where each copy has been slightly alte...
Hasnain says:
Some more insight on perceptual hashes in light of the recent Apple announcement.
“It shouldn’t come as a surprise that these algorithms will fail sometimes. But in the context of 100 million photos, they do fail quite often. And they don’t fail in acceptable ways: It’s easy to see that the general composition of these two images is similar (beige background with dark accents in the top right center). But their content is completely different. The collisions encountered with other hashing algorithms look different, often in unexpected ways, but collisions exist for all of them.”
Posted on 2021-08-06T22:16:20+0000