Journal of the Optical Society of Korea

Optical Society of Korea (한국광학회)
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QPSK Modulation Based Optical Image Cryptosystem Using Phase-shifting Digital Holography

  • Jeon, Seok-Hee (Department of Electronic Engineering, The University of Incheon) ;
  • Gil, Sang-Keun (Department of Electronic Engineering, The University of Suwon)
  • Received : 2010.04.07
  • Accepted : 2010.06.01
  • Published : 2010.06.25
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Abstract

We propose a new technique for the optical encryption of gray-level optical images digitized into 8-bits binary data by ASCII encoding followed by QPSK modulation. We made an encrypted digital hologram with a security key by using 2-step phase-shifting digital holography, and the encrypted digital hologram is recorded on a CCD camera with 256 gray-level quantized intensities. With these encrypted digital holograms, the phase values are reconstructed by the same security key and are decrypted into the original gray-level optical image by demodulation and decoding. Simulation results show that the proposed method can be used for cryptosystems and security systems.

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References

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