Optical Review

, Volume 15, Issue 4, pp 181–186

Optical encryption of gray-level image using on-axis and 2-f digital holography with two-step phase-shifting method

  • Seok Hee Jeon
  • Young Gwan Hwang
  • Sang Keun Gil
Regular Papers

DOI: 10.1007/s10043-008-0029-5

Cite this article as:
Jeon, S.H., Hwang, Y.G. & Gil, S.K. OPT REV (2008) 15: 181. doi:10.1007/s10043-008-0029-5

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.

Key words

optical encryption phase-shifting digital holography Fourier optics optical signal processing 

Copyright information

© The Optical Society of Japan 2008

Authors and Affiliations

  • Seok Hee Jeon
    • 2
  • Young Gwan Hwang
    • 1
    • 2
  • Sang Keun Gil
    • 1
    • 2
  1. 1.Department of Electronic EngineeringThe University of SuwonSuwonKorea
  2. 2.Department of Electronic EngineeringThe University of IncheonIncheonKorea