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Optical security system using multi-phase separation and phase-wrapping method  

Shin Chang Mok (Optical Signal Processing Lab, School of Electrical Engineering and Computer Science Kyungpook National University)
Kim Soo Joong (Optical Signal Processing Lab, School of Electrical Engineering and Computer Science Kyungpook National University)
Seo Dong Hoan (Division of Electrical and Electronics Engineering, Korea Maritime University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.42, no.6, 2005 , pp. 31-38 More about this Journal
Abstract
In this paper, we proposed an optical security system based on a gray-image exclusive-OR encryption using multi-phase separation and phase-wrapping method. For encryption, a gray image is sliced into binary images, which have the same pixel value, and these images are encrypted by modified XOR rules with binary random images. The XORed images and the binary images respectively combined and converted into full phase images, called an encrypted image and a key image. For decryption, when the encrypted image and key image are used as inputs on optical elements, Practically due to limited controllability of phase range in optical elements, the original gray image cannot be efficiently reconstructed by these optical elements. Therefore, by decreasing the phase ranges of the encrypted image and key image using a phase-wrapping method and separating these images into low-level phase images using multi-phase separation, the gray image can be reconstructed by optical elements which have limited control range. The decrytion process is simply implemented by interfering a multiplication result of encrypted image and key image with reference light. The validity of proposed scheme is verified and the effects, which are caused by phase limitation in decryption process, is analyzed by using computer simulations.
Keywords
optical security; phase-wrapping; multi-phase separation;
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