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Optical Engineering

Random phase encoding for optical security
Author(s): Ruikang K. Wang; Ian Alistair Watson; Christopher R. Chatwin
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Paper Abstract

A new optical encoding method for security applications is proposed. The encoded image (encrypted into the security products) is merely a random phase image statistically and randomly generated by a random number generator using a computer, which contains no information from the reference pattern (stored for verification) or the frequency plane filter (a phase-only function for decoding). The phase function in the frequency plane is obtained using a modified phase retrieval algorithm. The proposed method uses two phase-only functions (images) at both the input and frequency planes of the optical processor leading to maximum optical efficiency. Computer simulation shows that the proposed method is robust for optical security applications.

Paper Details

Date Published: 1 September 1996
PDF: 6 pages
Opt. Eng. 35(9) doi: 10.1117/1.600849
Published in: Optical Engineering Volume 35, Issue 9
Show Author Affiliations
Ruikang K. Wang, Univ. of Glasgow (United Kingdom)
Ian Alistair Watson, Univ. of Glasgow (United Kingdom)
Christopher R. Chatwin, Univ. of Sussex (United Kingdom)


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