Improved Polynomial Detectors for Side-Informed Watermarking

Jonathan Delhumeau 1 Teddy Furon 1 Guénolé Silvestre 2 Neil Hurley 2
1 TEMICS - Digital image processing, modeling and communication
IRISA - Institut de Recherche en Informatique et Systèmes Aléatoires, Inria Rennes – Bretagne Atlantique
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 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.
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  • HAL Id : inria-00080827, version 1

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Jonathan Delhumeau, Teddy Furon, Guénolé Silvestre, Neil Hurley. Improved Polynomial Detectors for Side-Informed Watermarking. Security and Watermarking of Multimedia Contents IV, SPIE, Jan 2002, San José, CA, USA, United States. pp.311-321. ⟨inria-00080827⟩

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