15 March 1996 Copy-proof machine-readable holograms for security application
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Abstract
The most frequently used optical security features to protect documents and goods against counterfeiting are various types of rainbow holograms and diffractive optical variable devices (OVDs). Although these features offer a fair degree of security and most known falsifications are rather crude imitations it is still possible to copy them with all hidden and visible information. In our opinion it would be helpful to have copy proof holograms containing a machine readable feature to achieve a doubtfree verification at point of sale and other sites. We present our work towards the development of a copy proof and machine readable hologram with an optically encoded security feature.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Guenther J. Dausmann, Irina Menz, Klaus Gnaedig, Zishao Yang, "Copy-proof machine-readable holograms for security application", Proc. SPIE 2659, Optical Security and Counterfeit Deterrence Techniques, (15 March 1996); doi: 10.1117/12.235461; https://doi.org/10.1117/12.235461
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KEYWORDS
Holograms

Information security

Glasses

3D image reconstruction

Holography

Holography applications

Sensors

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