Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Multiple-phase retrieval for optical security systems by use of random-phase encoding

Not Accessible

Your library or personal account may give you access

Abstract

The technique of the multiple phase encoding for optical security and verification systems is presented in this paper. This technique is based on a 4-f optical correlator that is a common architecture for optical image encryption and verification systems. However, two or more phase masks are iteratively retrieved by use of the proposed multiple phases retrieval algorithm (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 image than those in previous approaches. In addition, the quantization effects due to the finite resolution of the phase levels in practical implementation are discussed. The relationships between the number of phase masks and the quantized phase levels are also investigated. According to the simulation results, two and three phase masks are enough to design an efficient security verification system with 64 and 32 phase levels, respectively.

© 2002 Optical Society of America

Full Article  |  PDF Article
More Like This
Information security system by iterative multiple-phase retrieval and pixel random permutation

Xiang-Feng Meng, Lu-Zhong Cai, Xiu-Lun Yang, Xiao-Xia Shen, and Guo-Yan Dong
Appl. Opt. 45(14) 3289-3297 (2006)

Design of cascaded phase keys for a hierarchical security system

Chia H. Yeh, Hsuan T. Chang, Hung C. Chien, and Chung J. Kuo
Appl. Opt. 41(29) 6128-6134 (2002)

Practical image encryption and decryption by phase-coding technique for optical security systems

Junji Ohtsubo and Ayano Fujimoto
Appl. Opt. 41(23) 4848-4855 (2002)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (13)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (14)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved