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I've been seeing a steady increase in new search-by-image (perceptual search) systems. Much of this work is related to the image provenance problem: find the original version. I've seen a variety of new search technologies, including four new approaches this year. Some identify variations of the same picture, while others can identify instances of the same objects. A Perceptive Eye Different perceptual search engines serve different purposes. I often find myself using a combination of Google Im...