Information embedding using two-layer conjugate screening

Zhigang Fan

doi:10.1117/12.526625

3 June 2004 Information embedding using two-layer conjugate screening

Zhigang Fan

Proceedings Volume 5310, Optical Security and Counterfeit Deterrence Techniques V; (2004) https://doi.org/10.1117/12.526625
Event: Electronic Imaging 2004, 2004, San Jose, California, United States

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.

Citation Download Citation

Zhigang Fan "Information embedding using two-layer conjugate screening", Proc. SPIE 5310, Optical Security and Counterfeit Deterrence Techniques V, (3 June 2004); https://doi.org/10.1117/12.526625

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