Practical Watermarking scheme based on Wide Spread Spectrum and Game Theory
Campus de Beaulieu · 2002
In this paper, we consider the implementation of robust watermarking scheme for non i.i.d. Gaussian signals and distortion based on perceptual metrics. We consider this problem as a communication problem and formulated it as a game between an attacker and an embedder in order to establish its theoretical performance. We rst show that known parallel Gaussian channels technique does not lead to valid practical implementation, and then propose a new scheme based on Wide Spread Spectrum and Side Information. Theoretical performances of this scheme are established and shown to be very close to the upper bound on capacity dened by Parallel Gaussian channels. Practical implementation of this scheme is then presented and influence of the dierent parameters on performance is discussed. Finally, experimental results for image watermarking are presented and validate the proposed scheme.