1 January 2001 Optimization of encrypted holograms in optical security systems
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The method of the optimization for a binary phase hologram used in a security system is proposed. The hologram is made by a joint Fourier transform method and a simulated annealing technique is used for the optimization. A hologram of a fingerprint image with a random key reference is successfully optimized and almost the same image quality as the original one is obtained as a decoded image by the proposed method. The usefulness of the method in an optical security system is also discussed.
Mitsuhiro Yamazaki, Junji Ohtsubo, "Optimization of encrypted holograms in optical security systems," Optical Engineering 40(1), (1 January 2001). https://doi.org/10.1117/1.1334947

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