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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 8 — Mar. 10, 2013
  • pp: 1555–1563

Security enhancement of color image cryptosystem by optical interference principle and spiral phase encoding

Muhammad Rafiq Abuturab  »View Author Affiliations


Applied Optics, Vol. 52, Issue 8, pp. 1555-1563 (2013)
http://dx.doi.org/10.1364/AO.52.001555


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Abstract

A color information cryptosystem based on optical interference principle and spiral phase encoding is proposed. A spiral phase mask (SPM) is used instead of a conventional random phase mask because it contains multiple storing keys in a single phase mask. The color image is decomposed into RGB channels. The decomposed three RGB channels can avoid the interference of crosstalks efficiently. Each channel is encoded into an SPM and analytically generates two spiral phase-only masks (SPOMs). The two SPOMs are then phase-truncated to get two encrypted images and amplitude-truncated to produce two asymmetric phase keys. The two SPOMs and the two asymmetric phase keys can be allocated to four different authorized users. The order, the wavelength, the focal length, and the radius are construction parameters of the SPM (or third SPOM) that can also be assigned to the four other different authorized users. The proposed technique can be used for a highly secure verification system, so an unauthorized user cannot retrieve the original image if only one key out of eight keys is missing. The proposed method does not require iterative encoding or postprocessing of SPOMs to overcome inherent silhouette problems, and its optical setup alleviates stringent alignment of SOPMs. The validity and feasibility of the proposed method are supported by numerical simulation results.

© 2013 Optical Society of America

OCIS Codes
(050.0050) Diffraction and gratings : Diffraction and gratings
(070.0070) Fourier optics and signal processing : Fourier optics and signal processing
(100.2000) Image processing : Digital image processing

ToC Category:
Image Processing

History
Original Manuscript: November 12, 2012
Revised Manuscript: December 31, 2012
Manuscript Accepted: January 24, 2013
Published: March 4, 2013

Citation
Muhammad Rafiq Abuturab, "Security enhancement of color image cryptosystem by optical interference principle and spiral phase encoding," Appl. Opt. 52, 1555-1563 (2013)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-52-8-1555

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