Abstract
We present an optical coding technique that enhances the
anticounterfeiting power of security holograms. The principles of
the technique is based on the moire phenomenon. The code in the
hologram has a phase pattern that is invisible and cannot be
detected by optical equipment, so that imitation is extremely
difficult. Holographic, photographic and embossing technique are
used in fabricating coded holograms and decoders.
Original language | English |
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Journal | Applied Optics |
Volume | 36 |
Issue number | 31 |
Pages (from-to) | 8096-8097 |
Publication status | Published - 1997 |