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Proceedings Paper

Information embedding using two-layer conjugate screening
Author(s): Zhigang Fan
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Paper Abstract

In this paper, we described a method of embedding information in hardcopies that is both digitally and optically retrievable. The method is based on the concept of conjugate screening. Two screens are applied in the halftoning process, one of the areas that corresponds to the symbol to be embedded (object), and the other one for the background. Both screens can be conceptually decomposed into a two-layer structure similar to a multicenter dot. The top layer determines the overall halftone texture, while the bottom layer, which is conjugate for background and object, carries embedded data. Compared to other similar technologies, the proposed method is simple in computation and is robust to registration errors in retrieval.

Paper Details

Date Published: 3 June 2004
PDF: 6 pages
Proc. SPIE 5310, Optical Security and Counterfeit Deterrence Techniques V, (3 June 2004); doi: 10.1117/12.526625
Show Author Affiliations
Zhigang Fan, Xerox Corp. (United States)

Published in SPIE Proceedings Vol. 5310:
Optical Security and Counterfeit Deterrence Techniques V
Rudolf L. van Renesse, Editor(s)

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