An enhanced statistical approach for watermarking using wavelets

TitleAn enhanced statistical approach for watermarking using wavelets
Publication TypeJournal Article
Year of Publication2007
AuthorsAhmadi, H., A. S. Beheshti, and B. Foruzandeh
Journal2007 Canadian Conference on Electrical and Computer Engineering, Vols 1-3

In this paper a wavelet-based watermarking is proposed according to which watermark is embedded on a selected sets of wavelet coefficients with two different strength factors. The method, based on a criteria defined in the paper, distinguishes between dominant and non-dominant coefficients in each sub-band in an attempt to increase the embedded watermark power as much as possible It is shown that the use of two different strength factors - instead of a single global factor, results in an improved image quality preservation and in a more resilient watermark against different attacks. In this paper a new parameter, referred to statistical detection threshold SDT, was introduced and used to enhance the performance of watermarking. Several illustrative examples are given including a comparative analysis of the performance of the proposed method with the standard single global factor method and MAP-based watermark detection algorithm.

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