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Optical image encryption using a jigsaw transform for silhouette removal in interference-based methods and decryption with a single spatial light modulator |
Applied Optics, Vol. 50, Issue 13, pp. 1805-1811 (2011)
http://dx.doi.org/10.1364/AO.50.001805
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Abstract
Interference-based optical encryption schemes have an inherent silhouette problem due to the equipollent nature of the phase-only masks (POMs) generated using an analytical method. One of the earlier methods suggested that removing the problem by use of exchanging process between two masks increases the computational load. This shortcoming is overcome with a noniterative method using the jigsaw transformation (JT) in a single step, with improved security because the inverse JT of these masks, along with correct permutation keys that are necessary to decrypt the original image. The stringent alignment requirement of the POMs in two different arms during the experiment is removed with an alternative method using a single spatial light modulator. Experimental results are provided to demonstrate the decryption process with the proposed method.
© 2011 Optical Society of America
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
(100.0100) Image processing : Image processing
(200.3050) Optics in computing : Information processing
(100.4998) Image processing : Pattern recognition, optical security and encryption
ToC Category:
Image Processing
History
Original Manuscript: August 25, 2010
Revised Manuscript: December 24, 2010
Manuscript Accepted: December 28, 2010
Published: April 20, 2011
Citation
Pramod Kumar, Joby Joseph, and Kehar Singh, "Optical image encryption using a jigsaw transform for silhouette removal in interference-based methods and decryption with a single spatial light modulator," Appl. Opt. 50, 1805-1811 (2011)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-50-13-1805
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