Hiding techniques to enhance anticounterfeiting capacity of dot-matrix holograms

S. L. Yeh

doi:10.1117/1.2032107

1 August 2005 Hiding techniques to enhance anticounterfeiting capacity of dot-matrix holograms

S. L. Yeh

Author Affiliations +

Optical Engineering, Vol. 44, Issue 8, 087001 (August 2005). https://doi.org/10.1117/1.2032107

Abstract

The images on a dot-matrix hologram consist of many 2-D grating dots with different pitches and orientations. Only some specified pitches and 256 specified orientations are usually employed. The difference between any two pitches to show different colors is more than 0.1 µm; therefore, it is possible to hide several extra pitches in a specified pitch. If all the extra pitches are almost equal to the specified pitch, grating dots with extra pitches will be of nearly the same color as the specified pitch. When a laser beam is incident on the dot-matrix hologram with hidden pitches, data for the hidden pitches will be decoded by the diffraction pattern of the grating dots of the hologram. A specified grating orientation can be used to hide extra grating orientations similarly. What's better, mixing the above two hiding techniques is possible.

©(2005) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

S. L. Yeh "Hiding techniques to enhance anticounterfeiting capacity of dot-matrix holograms," Optical Engineering 44(8), 087001 (1 August 2005). https://doi.org/10.1117/1.2032107

Published: 1 August 2005

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