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R adio frequency identification (RFID) is in essence a form of computer vision. RFID devices are wireless microchips conceived as a way of tagging objects for automated identification. In part, their purpose is to compensate for shortcomings in computer recognition of objects using cameras. Of course, RFID has an advantage over even the most acute eyes and brain: it is in fact a form of X-ray vision. When we hold wallets up to card readers to unlock doors, for instance, we experience the factdoi:10.1109/jproc.2007.900324 fatcat:2occgruzafej3bifkd4maqdesm