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Are there any available APIs, libraries, or open-source solutions to filter images for pornographic content based on the images themselves?
There are some commercially available solutions, mentioned in the questions below.
None of those are available on iOS, and none of them are 100% accurate.
The best they can do is flag images for inspection by a real person.
A possibility is that you could pipe images through mechanical turk, using their api. You would be paying for every image inspection, but not a lot, so perhaps it’s doable depending on your business model.
You could couple mechanical turk with a skin detection algorithm using OpenCV, to only inspect images that contain skin… which would cut down the cost of image inspection.
Skin detection alone wouldn’t work, as there are wayyyy too many false-positives (bald people, skimpy clothing).