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How do you program that sort of thing?

Do you have to tell it what shapes/colors to look for? Or do a combination of overall image similar combined with localized image similarity and portion by portion image comparison?

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Maybe recognising the furniture in the background would work too ;) I remember there was a website/catalog of IKEA furniture somewhere made using NSFW photos.

Well Image Hashing is distinct from normal MD5 hashing as the hash does consider similarity of colour, etc. so it's not purely binary. A Google search produced a library called pHash.org that might do something similar.

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