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Proceedings Paper

An investigation of robustness in nonlinear audio watermarking
Author(s): Finbarr B. O'Donovan; Neil J. Hurley; Guenole C. M. Silvestre
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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 optimising 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 low-power signals, maximum detection power is obtained to first order by setting the watermark signal to the gradient of the detector. 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 which demonstrate some improved performance of the technique. Finally, the robustness of our side-informed scheme is assessed by computer simulations on real audio signals in the presence of additive, multiplicative and coloured noise resulting from perceptual coding for a low watermark to content power ratio.

Paper Details

Date Published: 21 March 2005
PDF: 10 pages
Proc. SPIE 5681, Security, Steganography, and Watermarking of Multimedia Contents VII, (21 March 2005); doi: 10.1117/12.587197
Show Author Affiliations
Finbarr B. O'Donovan, Univ. College Dublin (Ireland)
Neil J. Hurley, Univ. College Dublin (Ireland)
Guenole C. M. Silvestre, Univ. College Dublin (Ireland)

Published in SPIE Proceedings Vol. 5681:
Security, Steganography, and Watermarking of Multimedia Contents VII
Edward J. Delp; Ping W. Wong, Editor(s)

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