Learn More
In this paper, a new adaptive blind scheme for readable watermark is presented. First the readable watermark modulated by sine wave is inserted into the chaos-scrambled wavelet domain adaptively by the energy of wavelet coefficients. In detection, the chaos-scrambled wavelet coefficients and noise are modeled as wideband noise. Based on the good(More)
Hilbert-Huang transform (HHT) is a typical realization of the local wave analysis (LWA) and especially powerful for analysis of nonlinear and non-stationary signal. In this paper, from the view of filter, the principle of HHT will be studied and a smoothing filter theory will be put forward for explaining empirical mode decomposition (EMD). And because(More)
  • 1