When eBay bought Israel’s Corrigon last week for $30 million, it acquired its advanced image identification algorithms. These allow web users to home in on an image and find it elsewhere (e.g. to buy a product or protect copyright) even if the images have been colored, cropped or modified.
http://www.timesofisrael.com/ebay-buys-israels-corrigon-to-boost-buyer-experience/