CONFERENCE PROCEEDINGS
Advanced Search
Home > Proceedings > Volume 5578 > Article
Paper
9 December 2004 The study of watermark bar code recognition with light transmission theory
Fan Zhang, Tiegen Liu, Lianxiang Zhang, Xiaojun Zhang
Author Affiliations +
Proceedings Volume 5578, Photonics North 2004: Photonic Applications in Astronomy, Biomedicine, Imaging, Materials Processing, and Education; (2004) https://doi.org/10.1117/12.567214
Event: Photonics North, 2004, Ottawa, Ontario, Canada
Abstract
Watermark bar code is one of the latest anti-counterfeiting technologies, which is applicable to the security of various financial documents, especially banknotes. With the machine-readable watermark bar code, we can not only distinguish the genuine from the fake, but also recognize different face values of banknotes. So it is necessary to develop an effective method to read it. With watermark bar codes embedded in euro banknotes as samples, we design a system for watermark bar code recognition based on light transmission theory. An 808nm LD serves as light source. By receiving the transmitted light from behind the banknote with a high-speed photodetector, light transmission curves in different parts of different face value euro banknotes are obtained and analyzed in order to get the unique characteristic of watermark bar code. The correlation coefficient is then introduced for two reasons. For one thing, the high correlation coefficient derived from the light transmission curves shows the coherence of vertically placed watermark bar code area in different horizontal parts of the same face value banknote, which testifies the consistency and repeatability of the experiment. For another, the low correlation coefficient shows the irrelevance of watermark bar code area and other area of banknotes. What’s more, it also shows the difference of watermark bar code area of different face value banknotes. As a result, the machine-readable watermark bar code is made the unique characteristic of certain face value banknotes, which can distinguish them from both the counterfeit ones and other face value genuine banknotes.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation Download Citation
Fan Zhang, Tiegen Liu, Lianxiang Zhang, and Xiaojun Zhang "The study of watermark bar code recognition with light transmission theory", Proc. SPIE 5578, Photonics North 2004: Photonic Applications in Astronomy, Biomedicine, Imaging, Materials Processing, and Education, (9 December 2004); https://doi.org/10.1117/12.567214
ACCESS THE FULL ARTICLE
ORGANIZATIONAL
Sign in with credentials provided by your organization.
INSTITUTIONAL
Select your institution to access the SPIE Digital Library.
SELECT YOUR INSTITUTION
PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.
PERSONAL SIGN IN
No SPIE Account? Create one
PURCHASE THIS CONTENT
SUBSCRIBE TO DIGITAL LIBRARY
50 downloads per 1-year subscription
Members: $195
Non-members: $335 ADD TO CART
25 downloads per 1 - year subscription
Members: $145
Non-members: $250 ADD TO CART
PURCHASE SINGLE ARTICLE
Includes PDF, HTML & Video, when available
Members: $17.00
Non-members: $21.00 ADD TO CART
PROCEEDINGS
 8 PAGES
DOWNLOAD PAPER SAVE TO MY LIBRARY
GET CITATION
Advertisement
Advertisement
RIGHTS & PERMISSIONS
Get copyright permission  Get copyright permission on Copyright Marketplace
KEYWORDS
Digital watermarking
Sensors
Optoelectronics
Absorption
Light scattering
Information security
Scattering
RELATED CONTENT
Subscribe to Digital Library
Receive Erratum Email Alert
Back to Top