1 September 2006 Dot-matrix hologram with an encrypted figure
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Optical Engineering, 45(9), 095801 (2006). doi:10.1117/1.2353832
Abstract
A dot-matrix hologram contains many two-dimensional grating dots, which may have different features, e.g., two-dimensional positions, grating pitches, grating orientations, and dot sizes. In this paper, such features are used to encode binary data to hide a figure almost without changing the hologram appearance. Because many encoding methods are available, decoding the hidden figure without authorization can be very difficult. The encrypting scheme presented here possesses both feasible and confidential features.
Sheng-Lih L. Yeh, "Dot-matrix hologram with an encrypted figure," Optical Engineering 45(9), 095801 (1 September 2006). https://doi.org/10.1117/1.2353832
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