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Proceedings Paper

Multiple-phase retrieval for optical security systems using random phase encoding
Author(s): Hsuan Ting Chang; Wei Cheng Lu; Chung Jung Kuo
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Paper Abstract

The technique of the multiple phases retrieval algorithm (MPRA) for designing optical security and verification systems is proposed in this paper. This technique is based on a 4-f optical correlator, which is a common architecture for optical image encryption and verification systems. In the proposed systems, however, two or more phase masks are iteratively retrieved by using the MPRA to obtain the target image. The convergent speed of the iteration process in the MPRA is significantly increased and the recovered image is much more similar to the target one than those in previous approaches. Moreover, the system security is increased since only the pair-wise retrieved phase masks can correctly recover the target images. To avoid carrying two phase keys, one of the phase mask serves as the key and the other phase mask can be stored in the database of the security system as an active lock. Finally, according to our simulation results, the misalignment effects for the phase mask in the Fourier plane are more series than that in the input plane.

Paper Details

Date Published: 27 November 2002
PDF: 11 pages
Proc. SPIE 4789, Algorithms and Systems for Optical Information Processing VI, (27 November 2002); doi: 10.1117/12.450848
Show Author Affiliations
Hsuan Ting Chang, National Yunlin Univ. of Science and Technology (Taiwan)
Wei Cheng Lu, National Chung Cheng Univ. (Taiwan)
Chung Jung Kuo, National Chung Cheng Univ. (Taiwan)

Published in SPIE Proceedings Vol. 4789:
Algorithms and Systems for Optical Information Processing VI
Bahram Javidi; Demetri Psaltis, Editor(s)

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