Improved polynomial detectors for side-informed watermarking

Jonathan Delhumeau; Teddy Furon; Neil J. Hurley; Guenole C.M. Silvestre

doi:10.1117/12.476852

20 June 2003 Improved polynomial detectors for side-informed watermarking

Jonathan Delhumeau, Teddy Furon, Neil J. Hurley, Guenole C.M. Silvestre

Proceedings Volume 5020, Security and Watermarking of Multimedia Contents V; (2003) https://doi.org/10.1117/12.476852
Event: Electronic Imaging 2003, 2003, Santa Clara, CA, United States

Abstract

In spread-spectrum watermarking, the watermarked document is obtained from the addition of an attenuated watermark signal to a cover multimedia document. A traditional strategy consists of optimizing the detector for a given embedding function. In general, this leads to sub-optimal detection and much improvement can be obtained by exploiting side-information available at the embedder. In some prior art, the authors showed that for blind detection of small signals, maximum detection power is obtained to first order by setting the watermark signal to the gradient of the detector. Recently, Malvar et al. improved the performance of direct-sequence spread-spectrum watermarking by using a signal dependent modulation. In the first part of the paper, we develop this idea further and extend Costa's decoding theory to the problem of watermarking detection. In the second part, we propose a practical implementation of this work using non-linear detectors based on our family of polynomial functions. We show some improved performance of the technique.

Citation Download Citation

Jonathan Delhumeau, Teddy Furon, Neil J. Hurley, and Guenole C.M. Silvestre "Improved polynomial detectors for side-informed watermarking", Proc. SPIE 5020, Security and Watermarking of Multimedia Contents V, (20 June 2003); https://doi.org/10.1117/12.476852

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