1 June 2005 Investigation of digital hologram watermarking with double binary phase encoding
Author Affiliations +
Optical Engineering, 44(6), 067007 (2005). doi:10.1117/1.1935268
Abstract
We propose a new method of digital watermarking with the double binary optical phase encoding technique. The iterative Fourier transform algorithm (IFTA) is used to generate the binary phase structures. The combination of two binary phase structures, in which one is used to encode the hidden image and the other is used as the encryption phase key, is inserted as a watermark into the host image. The effects of phase levels of binary phase holograms on the quality of extracted image are analyzed, and the results show that the 2/2 phase level combination is a better scheme for watermarking than other multiple combinations. We also present the principle of the encrypting key. Both analysis and experimental results illustrate that this technique is of high security and robust against the printing and scanning process.
Xiaohong Zhou, Linsen Chen, Jie Shao, "Investigation of digital hologram watermarking with double binary phase encoding," Optical Engineering 44(6), 067007 (1 June 2005). http://dx.doi.org/10.1117/1.1935268
JOURNAL ARTICLE
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KEYWORDS
Digital watermarking

Image quality

Binary data

Digital holography

Feature extraction

Fourier transforms

Diffraction

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