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Journal of the Optical Society of Korea

Journal of the Optical Society of Korea

| PUBLISHED BY THE OPTICAL SOCIETY OF KOREA

  • Vol. 14, Iss. 2 — Jun. 25, 2010
  • pp: 97–103

QPSK Modulation Based Optical Image Cryptosystem Using Phase-shifting Digital Holography

Seok-Hee Jeon and Sang-Keun Gil  »View Author Affiliations


Journal of the Optical Society of Korea, Vol. 14, Issue 2, pp. 97-103 (2010)


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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.

© 2010 Optical Society of Korea

OCIS Codes
(070.0070) Fourier optics and signal processing : Fourier optics and signal processing
(070.4560) Fourier optics and signal processing : Data processing by optical means
(090.0090) Holography : Holography
(090.2880) Holography : Holographic interferometry
(170.3010) Medical optics and biotechnology : Image reconstruction techniques

History
Original Manuscript: April 7, 2010
Revised Manuscript: May 31, 2010
Manuscript Accepted: June 1, 2010
Published: June 25, 2010

Citation
Seok-Hee Jeon and Sang-Keun Gil, "QPSK Modulation Based Optical Image Cryptosystem Using Phase-shifting Digital Holography," J. Opt. Soc. Korea 14, 97-103 (2010)
http://www.opticsinfobase.org/josk/abstract.cfm?URI=josk-14-2-97


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