Journal of the Optical Society of Korea

Optical Society of Korea (한국광학회)
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2-step Phase-shifting Digital Holographic Optical Encryption and Error Analysis

  • Jeon, Seok-Hee (Department of Electronic Engineering, The University of Incheon) ;
  • Gil, Sang-Keun (Department of Electronic Engineering, The University of Suwon)
  • Received : 2011.08.23
  • Accepted : 2011.09.06
  • Published : 2011.09.25
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Abstract

We propose a new 2-step phase-shifting digital holographic optical encryption technique and analyze tolerance error for this cipher system. 2-step phase-shifting digital holograms are acquired by moving the PZT mirror with phase step of 0 or ${\pi}$/2 in the reference beam path of the Mach-Zehnder type interferometer. Digital hologram with the encrypted information is Fourier transform hologram and is recorded on CCD camera with 256 gray-level quantized intensities. The decryption performance of binary bit data and image data is analyzed by considering error factors. One of the most important errors is quantization error in detecting the digital hologram intensity on CCD. The more the number of quantization error pixels and the variation of gray-level increase, the more the number of error bits increases for decryption. Computer experiments show the results to be carried out encryption and decryption with the proposed method and the graph to analyze the tolerance of the quantization error in the system.

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References

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