Key-dependency for a wavelet-based blind watermarking algorithm

Authors:
Michael Brachtl;Andreas Uhl;Werner Dietl
Affiliations:
University of Salzburg, Austria;University of Salzburg, Austria;ETH Zürich, Zürich, Switzerland
Venue:
Proceedings of the 2004 workshop on Multimedia and security
Year:
2004

Citing 5
Cited 1

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Abstract

When a host image is watermarked multiple times by the same algorithm collisions can occur. This makes it difficult for an image to host multiple watermarks. But this hosting is necessary for an image distribution chain, where several persons all watermark the same image. Wavelet domain transformations provide several possibilities to customize the transformation process. We discuss the applicability of the methods of wavelet filter parametrization and wavelet packet decomposition for secret watermark embedding on the algorithm of Dugad et al. We conclude that filter parametrization is not suited while wavelet packet decomposition shows good results.