Researchers at Purdue University have developed image analysis techniques that may one day help tie counterfeit money and forged documents to the printers that produced them. In lab experiments, the researchers examined documents that came from 12 different models of printers and were able to correctly link a document to its printer 11 times. The techniques currently let forensic investigators match a document with only a specific printer model, but will be honed so that a document can be matched to a particular printer.
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