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Applied Optics

Applied Optics


  • Vol. 44, Iss. 13 — May. 1, 2005
  • pp: 2600–2606

Phase-only encryption and watermarking based on phase-shifting interferometry

Ming-Zhao He, Lu-Zhong Cai, Qing Liu, and Xiu-Lun Yang  »View Author Affiliations

Applied Optics, Vol. 44, Issue 13, pp. 2600-2606 (2005)

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Generally, the reconstruction of an object image from its diffraction field requires both the amplitude and the phase information of this field. We systematically investigated the effects of using only the real part, the imaginary part, or the phase information of the diffraction field to reconstruct the original image for both the binary and the gray-level images. We show that the phase information can yield a better result of image retrieval than the real or imaginary part and that the recovered image from the phase information is satisfactory especially for binary input. On the basis of this idea, a new technique of image encryption and watermarking by use of only one delivered image—the phase map of the diffraction field of the original image—through double random-phase encoding is proposed and verified by computer simulations with phase-shifting interferometry. This method can greatly cut down the communication load and is suitable for Internet transmission.

© 2005 Optical Society of America

OCIS Codes
(090.2880) Holography : Holographic interferometry
(100.2000) Image processing : Digital image processing
(100.3020) Image processing : Image reconstruction-restoration
(100.5070) Image processing : Phase retrieval

Original Manuscript: June 16, 2004
Revised Manuscript: November 23, 2004
Manuscript Accepted: December 3, 2004
Published: May 1, 2005

Ming-Zhao He, Lu-Zhong Cai, Qing Liu, and Xiu-Lun Yang, "Phase-only encryption and watermarking based on phase-shifting interferometry," Appl. Opt. 44, 2600-2606 (2005)

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