Visual hologram security

Pawel J. Stepien; Roman Stachowiak

doi:10.1117/12.577098

26 August 2004 Visual hologram security

Pawel J. Stepien, Roman Stachowiak

Author Affiliations +

Proceedings Volume 5566, Optical Security and Safety; (2004) https://doi.org/10.1117/12.577098
Event: Optical Security and Safety, 2003, Warsaw, Poland

Abstract

Visual features of classical and high-tech security holograms are described and their advantages and shortbacks discussed. New holographic features, improving both security hologram visual appeal and its anticounterfeiting value are described. 2D/3D backgrounds can be highly improved using multicolor textures, smooth changing color pattern and variable background depth. Complex grating based images with a lot of colors and smooth transitions between them highly improves visual and security value of grating based optically variable devices. Modulation of grating parameters may create distinguishing effect of glossy 3D surface. Combining various holographic features increases security holograms value very significantly.

Citation Download Citation

Pawel J. Stepien and Roman Stachowiak "Visual hologram security", Proc. SPIE 5566, Optical Security and Safety, (26 August 2004); https://doi.org/10.1117/12.577098

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