25 November 1993 Anticounterfeit holographic marks with secret codes
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Abstract
The paper introduces the methods of making secret codes in the holograms for the purpose of anti-counterfeiting, especially the production of two kinds of visual holographic secret codes. The optical arrangements for recording are presented, and the effective results from using the visual secret codes into holographic trade marks are reported.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Shou Liu, Xiangsu Zhang, and Hongkai Lai "Anticounterfeit holographic marks with secret codes", Proc. SPIE 2000, Current Developments in Optical Design and Optical Engineering III, (25 November 1993); doi: 10.1117/12.163649; https://doi.org/10.1117/12.163649
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