A Novel Watermarking Scheme Based on Stochastic Resonance

A Novel watermarking scheme based on stochastic resonance (SR) is introduced. SR has been studied extensively in the area of weak signal detection and baseband binary PAM signals transmission. In this paper, the watermark is viewed as weak binary signals, and the median-frequency DCT components of all the 8times8 image blocks are randomly permuted to be an approximate white Gaussian noise (WGN). When the watermark signals which are corrupted by the noise go through the well tuned nonlinear system, SR occurs and the output signal noise ratio is amplified. Then the watermark signals are recovered by judging whether the sum of the stable points is positive or not. The simulation has shown that the proposed watermarking scheme has the advantage of robustness, invisibility, and practicability