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Printing provides innate forensic capabilities useful for product security as a consequence of the microscopic stochastic nature of the printing process itself and ink/substrate interaction during printing. This is especially true for substrates with a high degree of surface roughness/porosity,
such as office paper, recycled paper, cardstock and packaging. Further imperfections are incurred during high speed printing, which taxes the limitations of the printing processes. These imperfections, consistent with reduced print quality, can be used serendipitously to provide a unique identifier
for any printed symbol. This paper describes the hardware design for an imaging device that can analyze, with 7600 lines/inch resolving capability over a relatively large field of view of 6.6 x 4.9mm, any printed mark—from character to glyph to outline of an image—with high mark
specificity. Combined with image analysis software written to describe the interface, or boundary, between ink-covered and ink-free substrate, this device, dubbed the Dr. CID (Dyson Relay CMOS Imaging Device ), can provide simultaneous image authentication and forensics.
Document Type: Research Article
Publication date: January 1, 2010
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For more than 25 years, NIP has been the leading forum for discussion of advances and new directions in non-impact and digital printing technologies. A comprehensive, industry-wide conference, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems, including drop-on-demand ink jet, wide format ink jet, desktop and continuous ink jet, toner-based electrophotographic printers, production digital printing systems, and thermal printing systems, as well as the engineering capability, optimization, and science involved in these fields.
Since 2005, NIP has been held in conjunction with the Digital Fabrication Conference.