Hidden and scrambled images: a review

Rudolf L. van Renesse

doi:10.1117/12.462726

19 April 2002 Hidden and scrambled images: a review

Rudolf L. van Renesse

Proceedings Volume 4677, Optical Security and Counterfeit Deterrence Techniques IV; (2002) https://doi.org/10.1117/12.462726
Event: Electronic Imaging, 2002, San Jose, California, United States

Abstract

This paper reviews screen-decoded images, images that are invisible or illegible to the naked eye but that are visualized or decoded by means of periodic phenomena, such as an absorptive grating, a lenticular screen or the sampling frequency of a copying system. Two basic types are distinguished: carrier screen images and scrambled images. Carrier screen images consist of periodical arrays of screen elements, such as dots and lines, which serve as a carrier on which the encoded information is modulated. The counterpart of the carrier screen images is the scrambled image, which consists of numerous separate dissections of the original image. A classification of screen-decoded images by the type of carrier screen is presented in an attempt to clear up the existing confusion in nomenclature.

Citation Download Citation

Rudolf L. van Renesse "Hidden and scrambled images: a review", Proc. SPIE 4677, Optical Security and Counterfeit Deterrence Techniques IV, (19 April 2002); https://doi.org/10.1117/12.462726

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