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Proceedings Paper

Improved polynomial detectors for side-informed watermarking
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Paper 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.

Paper Details

Date Published: 20 June 2003
PDF: 11 pages
Proc. SPIE 5020, Security and Watermarking of Multimedia Contents V, (20 June 2003); doi: 10.1117/12.476852
Show Author Affiliations
Jonathan Delhumeau, IRISA/INRIA (France)
Teddy Furon, IRISA/INRIA (France)
Neil J. Hurley, Univ. College Dublin (Ireland)
Guenole C.M. Silvestre, Univ. College Dublin (Ireland)

Published in SPIE Proceedings Vol. 5020:
Security and Watermarking of Multimedia Contents V
Edward J. Delp; Ping Wah Wong, Editor(s)

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