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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 15 — May. 20, 2012
  • pp: 3006–3016

Color image security system using double random-structured phase encoding in gyrator transform domain

Muhammad Rafiq Abuturab  »View Author Affiliations

Applied Optics, Vol. 51, Issue 15, pp. 3006-3016 (2012)

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A novel method for encoding color information based on a double random phase mask and a double structured phase mask in a gyrator transform domain is proposed. The amplitude transmittance of the Fresnel zone plate is used as structured phase-mask encoding. A color image is first segregated into red, green, and blue component images. Each of these component images are then independently encrypted using first a random phase mask placed at the image plane and transmitted through the first structured phase mask. They are then encoded by the first gyrator transform. The resulting information is again encrypted by a second random phase mask placed at the gyrator transform plane and transmitted through the second structured phase mask, and then encoded by the second gyrator transform. The system parameters of the structured phase mask and gyrator transform in each channel serve as additional encryption keys and enlarge the key space. The encryption process can be realized with an electro-optical hybrid system. The proposed system avoids problems arising from misalignment and benefits of a higher space–bandwidth product. Numerical simulations are presented to confirm the security, validity, and possibility of the proposed idea.

© 2012 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:
Fourier Optics and Signal Processing

Original Manuscript: October 31, 2011
Revised Manuscript: January 10, 2012
Manuscript Accepted: March 5, 2012
Published: May 18, 2012

Muhammad Rafiq Abuturab, "Color image security system using double random-structured phase encoding in gyrator transform domain," Appl. Opt. 51, 3006-3016 (2012)

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