Abstract

We present an optical coding technique that enhances the anticounterfeiting power of security holograms. The principle of the technique is based on the moiré 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 techniques are used in fabricating coded holograms and decoders.

© 1997 Optical Society of America

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References

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  1. S. Liu, X. Zhang, H. Lai, “Anticounterfeit holographic marks with secret codes,” in Current Developments in Optical Design and Optical Engineering III, R. E. Fischer, W. J. Smiths, eds., Proc. SPIE2000, 315–317 (1993).
    [CrossRef]
  2. S. Liu, X. Zhang, H. Lai, “Artistic effect and application of moiré patterns in security holograms,” Appl. Opt. 34, 4700–4702 (1995).
    [CrossRef] [PubMed]
  3. J. Guild, The Interference Systems of Crossed Diffraction Gratings: Theory of Moiré Fringes (Clarendon, Oxford, UK, 1956).
  4. B. Javidi, J. Horner, “Optical pattern recognition for validation and security verification,” Opt. Eng. 33, 1752–1756 (1994).
    [CrossRef]

1995 (1)

1994 (1)

B. Javidi, J. Horner, “Optical pattern recognition for validation and security verification,” Opt. Eng. 33, 1752–1756 (1994).
[CrossRef]

Guild, J.

J. Guild, The Interference Systems of Crossed Diffraction Gratings: Theory of Moiré Fringes (Clarendon, Oxford, UK, 1956).

Horner, J.

B. Javidi, J. Horner, “Optical pattern recognition for validation and security verification,” Opt. Eng. 33, 1752–1756 (1994).
[CrossRef]

Javidi, B.

B. Javidi, J. Horner, “Optical pattern recognition for validation and security verification,” Opt. Eng. 33, 1752–1756 (1994).
[CrossRef]

Lai, H.

S. Liu, X. Zhang, H. Lai, “Artistic effect and application of moiré patterns in security holograms,” Appl. Opt. 34, 4700–4702 (1995).
[CrossRef] [PubMed]

S. Liu, X. Zhang, H. Lai, “Anticounterfeit holographic marks with secret codes,” in Current Developments in Optical Design and Optical Engineering III, R. E. Fischer, W. J. Smiths, eds., Proc. SPIE2000, 315–317 (1993).
[CrossRef]

Liu, S.

S. Liu, X. Zhang, H. Lai, “Artistic effect and application of moiré patterns in security holograms,” Appl. Opt. 34, 4700–4702 (1995).
[CrossRef] [PubMed]

S. Liu, X. Zhang, H. Lai, “Anticounterfeit holographic marks with secret codes,” in Current Developments in Optical Design and Optical Engineering III, R. E. Fischer, W. J. Smiths, eds., Proc. SPIE2000, 315–317 (1993).
[CrossRef]

Zhang, X.

S. Liu, X. Zhang, H. Lai, “Artistic effect and application of moiré patterns in security holograms,” Appl. Opt. 34, 4700–4702 (1995).
[CrossRef] [PubMed]

S. Liu, X. Zhang, H. Lai, “Anticounterfeit holographic marks with secret codes,” in Current Developments in Optical Design and Optical Engineering III, R. E. Fischer, W. J. Smiths, eds., Proc. SPIE2000, 315–317 (1993).
[CrossRef]

Appl. Opt. (1)

Opt. Eng. (1)

B. Javidi, J. Horner, “Optical pattern recognition for validation and security verification,” Opt. Eng. 33, 1752–1756 (1994).
[CrossRef]

Other (2)

S. Liu, X. Zhang, H. Lai, “Anticounterfeit holographic marks with secret codes,” in Current Developments in Optical Design and Optical Engineering III, R. E. Fischer, W. J. Smiths, eds., Proc. SPIE2000, 315–317 (1993).
[CrossRef]

J. Guild, The Interference Systems of Crossed Diffraction Gratings: Theory of Moiré Fringes (Clarendon, Oxford, UK, 1956).

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Figures (2)

Fig. 1
Fig. 1

Schematic diagram of optical geometry for code recording.

Fig. 2
Fig. 2

Coded security hologram before and after decoding is performed: (a) Before decoding is performed, the holographic image is clear and the code is invisible. (b) The decoder overlaps the hologram and the moiré pattern is revealed. (c) The moiré pattern is clear after the viewing angle of the hologram is adjusted.

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