Optical encryption of gray-level image using on-axis and 2-f digital holography with two-step phase-shifting method |
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Authors: | Seok Hee Jeon Young Gwan Hwang Sang Keun Gil |
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Affiliation: | (1) Department of Electronic Engineering, The University of Suwon, Suwon, 440-600, Korea;(2) Department of Electronic Engineering, The University of Incheon, Incheon, 402-749, Korea |
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Abstract: | In this paper we propose an encryption/decryption technique of gray-level image information using an on-axis 2-f digital holographic optical encrypting system with two-step phase-shifting method. This technique reduces the number of holograms in phase-shifting digital holography and minimizes the setup of the encryption system more than multistep phase-shifting technique. We are able to get the complete decrypted image by controlling the K-ratio which is defined as the reference beam intensity versus the object beam intensity. We remove the DC-term of the phase-shifting digital hologram to reconstruct and decrypt the original image information. Simulation results show that the proposed method can be used for encryption and decryption of a 256 gray-level image. Also, the result shows some errors of the decrypted image according to K-ratio. |
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Keywords: | optical encryption phase-shifting digital holography Fourier optics optical signal processing |
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