An Adaptive Blind Scheme for Readable Watermark Based on ALE

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 separability of adaptive line enhancement (ALE) to wideband noise and sinusoidal signal, using least mean square (LMS) algorithm, the modulated watermark is extracted adaptively and blindly. Finally a watermark correlation receiver (WCR) is devised for the optimal demodulation in minimum error probability sense. The experiments show that the proposed scheme is satisfied with imperceptibility and robustness well