Pure-phase iteratively generated Fourier hologram as a security mark

Pawel J. Stepien; Remigiusz Gajda

doi:10.1117/12.235468

15 March 1996 Pure-phase iteratively generated Fourier hologram as a security mark

Pawel J. Stepien, Remigiusz Gajda

Proceedings Volume 2659, Optical Security and Counterfeit Deterrence Techniques; (1996) https://doi.org/10.1117/12.235468
Event: Electronic Imaging: Science and Technology, 1996, San Jose, CA, United States

Abstract

Optically recorded Fourier holograms readable by special laser detectors are frequently used as 'hidden' elements on optically variable devices (OVDs) used for security purpose. However, they are not difficult to identify and reproduce in holographic laboratory. In this paper we propose the use of the phase only computer generated Fourier hologram for security purposes. Its main feature is a possibility of recording a referenceless Fourier hologram which may form a nonsymmetric image. Such an element may be viewed even in the sunlight and it is impossible to manufacture it using standard analog holographic techniques. To obtain the best quality the hologram should be calculated using iterative Fourier-transform algorithm (IFTA) and manufactured using multiple-phase-step or continuous-phase technologies.

Citation Download Citation

Pawel J. Stepien and Remigiusz Gajda "Pure-phase iteratively generated Fourier hologram as a security mark", Proc. SPIE 2659, Optical Security and Counterfeit Deterrence Techniques, (15 March 1996); https://doi.org/10.1117/12.235468

ACCESS THE FULL ARTICLE

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