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Fully Phase-based Optical Encryption System Using Computer Holography and Fresnel Diffraction  

윤경효 (LG전자 디지털 영상사업부 영상제품연구소)
신창목 (경북대학교 전자전기컴퓨터공학부)
조규보 (경북대학교 전자전기컴퓨터공학부)
김수중 (경북대학교 전자전기컴퓨터공학부)
김철수 (경주대학교 컴퓨터전자공학부)
서동환 (한국해양대학교 전기전자공학부)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.41, no.11, 2004 , pp. 43-51 More about this Journal
Abstract
In this paper, we propose a high-level optical encryption system, which is tolerant with noises and cropping, by encrypting the phase-encoded CGH pattern of original image with the phase-encoded Fresnel diffraction pattern of random key images. For encryption, the phase-encoded CGH pattern of original image is multiplied by conjugate components which are the phase-encoded Fresnel diffraction patterns of random key images. The original information can be reconstructed by multiplying encrypted image by phase-encoded Fresnel diffraction pattern of random key images and performing Fourier transform of the multiplication result. The proposed system is robust to noises and cropping due to characteristics of CGH pattern and can guarantee high-level encryption by using Fresnel diffraction information. We verified the validity of proposed system by computer simulations, numerical analysis of noises and cropping effect and optical experiment.
Keywords
optical security; computer holography; Fresnel diffraction;
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