Abstract
Optical variable devices (OVDs), such as holograms, are now common in the field of document security. Up until now mass-produced embossed holograms or other types of mass-produced OVDs are used not only for banknotes but also for personalized documents, such as passports, ID cards, travel documents, driving licenses, credit cards, etc. This means that identical OVDs are used on documents issued to individuals. Today, there is need for a higher degree of security on such documents and this chapter covers new techniques to make improved mass-produced or personalized OVDs.
The introduction of volume holography offers a possibility to apply monochrome and full color reflection holograms in the field of document security. A presentation of the technique and recording materials used for volume and color holography is provided. Another technique, interferential photography or Lippmann photography, represents a new type of OVD, which belongs to the interference security image structures. In this type of photography, color is recorded in a photosensitive film as a black-and-white interference structure. The technique offers additional advantages over holographic labels for unique security applications. The application of the Lippmann OVD for document security and counterfeit-resistant purposes is presented here.
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Bjelkhagen, H.I. (2006). Improved Optical Document Security Techniques Based on Volume Holography and Lippmann Photography. In: Javidi, B. (eds) Optical Imaging Sensors and Systems for Homeland Security Applications. Advanced Sciences and Technologies for Security Applications, vol 2. Springer, New York, NY. https://doi.org/10.1007/0-387-28001-4_19
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DOI: https://doi.org/10.1007/0-387-28001-4_19
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