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, 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); doi: 10.1117/12.349342; https://doi.org/10.1117/12.349342

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