Calling The Shots: New Technique Links Digital Images to Exact Camera Just as ballistic experts can trace bullet casings back to the gun that fired the shell, university researchers have devised a way to trace specific digital photographs back to the exact digital camera that took the photo.
Every original digital picture is overlaid by a weak noiselike pattern of pixel-to-pixel nonuniformity, according to Jessica Fridrich, an associate professor of electrical and computer engineering at Binghamton University, State University of New York.
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