Watermarks encrypted in a concealogram and deciphered by a modified joint-transform correlator
Applied Optics, Vol. 44, Issue 15, pp. 3019-3023 (2005)
http://dx.doi.org/10.1364/AO.44.003019
Acrobat PDF (1657 KB)
Abstract
We describe an electro-optical method of deciphering a watermark from a recently invented encoded image termed a concealogram. The watermark is revealed as a result of spatial correlation between two concealograms, one containing the watermark and the other containing the deciphering key. The two are placed side by side on the input plane of a modified joint-transform correlator. When the input plane is illuminated by a plane wave, the watermark image is reconstructed on part of the correlator's output plane. The key function deciphers the concealed watermark from the visible picture only when the two specific concealograms are matched. To illustrate the system's performance, both simulation and experimental results are presented.
© 2005 Optical Society of America
OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(070.2580) Fourier optics and signal processing : Paraxial wave optics
(070.4550) Fourier optics and signal processing : Correlators
(070.4560) Fourier optics and signal processing : Data processing by optical means
(090.1760) Holography : Computer holography
(100.2810) Image processing : Halftone image reproduction
Citation
David Abookasis, Ofir Montal, Ohad Abramson, and Joseph Rosen, "Watermarks encrypted in a concealogram and deciphered by a modified joint-transform correlator," Appl. Opt. 44, 3019-3023 (2005)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-44-15-3019
You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Log in to access OSA Member Subscription
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Log in to access OSA Member Subscription
You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Log in to access OSA Member Subscription
Related Journal Articles 
- Optical Encryption System with a Binary Key Code (AO)
- Security and Encryption Optical Systems Based on a Correlator with Significant Output Images (AO)
- Computer-Generated Holograms of Three-Dimensional Realistic Objects Recorded Without Wave Interference (AO)
- Hidden Images in Halftone Pictures (AO)
- Diffractive Optical Elements as Raster-Image Generators (AO)
Related Conference Papers
- Widely Tunable Time Delay Control in Phase-Shifted Gain/Loss Coupled Distributed Feedback Structures
- Novel optical packet header decoding via cross-correlation
- Dispersion-compensated Lau-like processor
- Computer-Generated Hologram Calculated from Multi-View Images of Real Existing Objects
- Novel design digital holographic system with LCOS spatial light modulators for diffractive element synthesis
« Previous Article | Next Article »
OSA is a member of 