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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Glenn D. Boreman
  • Vol. 44, Iss. 29 — Oct. 10, 2005
  • pp: 6211–6219

Image watermarking by use of digital holography embedded in the discrete-cosine-transform domain

Hsuan T. Chang and Chung L. Tsan  »View Author Affiliations


Applied Optics, Vol. 44, Issue 29, pp. 6211-6219 (2005)
http://dx.doi.org/10.1364/AO.44.006211


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Abstract

Digital holography techniques can be utilized to implement image watermarking schemes. In a previous method proposed by Takai and Mifune [ Appl. Opt. 41, 865 ( 2002)], a watermark image is transformed into a digital Fourier hologram, which then is directly superposed onto a content image to perform the embedding process. In the detection stage, the watermark is extracted based on the inverse Fourier transform and optical holography techniques. A method in which the hologram is superposed on the discrete-cosine-transform domain of the content image is proposed to significantly improve Takai and Mifune’s method. The proposed method can greatly reduce the degradation on the superposed image, which is the major drawback in Takai and Mifune’s method. Simulation results also demonstrate that the watermark can be successfully extracted under different kinds of attack.

© 2005 Optical Society of America

OCIS Codes
(070.0070) Fourier optics and signal processing : Fourier optics and signal processing
(090.1760) Holography : Computer holography
(100.2000) Image processing : Digital image processing

ToC Category:
Holography

History
Original Manuscript: March 4, 2005
Revised Manuscript: May 10, 2005
Manuscript Accepted: June 2, 2005
Published: October 10, 2005

Citation
Hsuan T. Chang and Chung L. Tsan, "Image watermarking by use of digital holography embedded in the discrete-cosine-transform domain," Appl. Opt. 44, 6211-6219 (2005)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-44-29-6211


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References

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