Random phase encoding for optical security

Wang, R. K., Watson, I. A. and Chatwin, C. (1996) Random phase encoding for optical security. Optical Engineering, 35(9), p. 2464. (doi: 10.1117/1.600849)

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Publisher's URL: http://dx.doi.org/10.1117/1.600849


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.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Watson, Dr Ian and Chatwin, Prof Christopher
Authors: Wang, R. K., Watson, I. A., and Chatwin, C.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Optical Engineering
ISSN (Online):1560-2303

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