Quaternion image watermarking using the spatio-chromatic fourier coefficients analysis

Authors:
Tsz Kin Tsui;Xiao-Ping Zhang;Dimitri Androutsos
Affiliations:
Ryerson University, Toronto, Canada;Ryerson University, Toronto, Canada;Ryerson University, Toronto, Canada
Venue:
MULTIMEDIA '06 Proceedings of the 14th annual ACM international conference on Multimedia
Year:
2006

Citing 2
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Abstract

In this paper, a new color watermarking algorithm that uses the quaternion fourier transform (QFT) to mark the La*b* components of color images is presented. First, we propose an interpretation of the QFT coefficients using the Spatio-Chromatic Fourier analysis, so the effects of any changes to the coefficients can be predicted. Next, watermark casting is performed by modifying the positive and negative coefficients together. The idea is twofold: Robustness is achieved by embedding a color watermark in the coefficient with positive frequency, which spreads it to all components in the spatial domain. On the other hand, invisibility is satisfied by modifying the coefficient with negative frequency, such that the combined effects of the two are insensitive to human eyes.