The study of watermark bar code recognition with light transmission theory

Details The study of watermark bar code recognition with light transmission theory The study of watermark bar code recognition with light transmission theory

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004spie.5578..437z&link_type=abstract

Photonics North 2004: Optical Components and Devices. Edited by Armitage, John C.; Fafard, Simon; Lessard, Roger A.; Lampropoul

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Watermark bar code is one of the latest anti-counterfeiting technologies, which is applicable to a series of security documents, especially banknotes. With watermark bar codes embedded euro banknotes as an example, a system is designed for watermark bar code detection and recognition based on light transmission theory. We obtain light transmission curves of different denominations along different sampling lines which are paralleled to the latitudinal axis of the banknote. By calculating the correlation coefficient between different light transmission curves, the system can not only distinguish the reference banknote from either the counterfeit ones or other denominations, but also demonstrates high consistency and repeatability.

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