Watermarks encrypted in a concealogram and deciphered by a modified joint-transform correlator

David Abookasis, Ofir Montal, Ohad Abramson, Joseph Rosen

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

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.

Original languageEnglish
Pages (from-to)3019-3023
Number of pages5
JournalApplied Optics
Volume44
Issue number15
DOIs
StatePublished - 20 May 2005

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