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1 June 1999 Holographic anticounterfeit method and device with encoded pattern
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An advanced holographic anti-counterfeit method and device is proposed to make the labels, which are used to identify the commercial products, being highly difficult to duplicate. This method provides a dot-matrix hologram, which is formed with a synthesized image including a random dispersed background pattern and a creative graphic design as a hidden pattern encoded into the background pattern. The background pattern is visible to the naked eyes of a viewer, but the hidden pattern can be viewed only through a special viewing device, such as a lenticular lens sheet. If the lenticular lens sheet covers the hologram irrelevantly or with an unfitted specification, the hidden pattern can't be decoded, and the moire effect will appear. A logo of U.S. MAIL is demonstrated as the encoded pattern, and the synthesized image is recorded in a 35 mm X 35 nm dot- matrix hologram on the photo-plate.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Pai Ping Huang "Holographic anticounterfeit method and device with encoded pattern", Proc. SPIE 3633, Diffractive and Holographic Technologies, Systems, and Spatial Light Modulators VI, (1 June 1999);

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