Description:  These microscope images show rough surfaces of paper (top) and plastic (bottom) that allow a laser scanning system to identify individual documents and credit cards.
Source:  Del Atkinson and Gang Xiong, Durham University
Story:  Textures ID paper and plastic
TRN August 10/17, 2005
TRN Categories:  Cryptography and Security; Optical Computing, Optoelectronics and Photonics
Form:  Still

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