A robust wavelet based digital watermarking scheme using chaotic mixing

Digital piracy is the major driving force behind the research in the field of watermarking. In this paper a watermarking scheme is proposed to protect the digital images from illegal copying. The proposed scheme uses chaotic mixing based on Torus Automorphism (TA) to scramble the watermark image, applies the watermark by modifying the wavelet coefficients of the image and requires original host image for extraction of the watermark. The scheme is robust to several signal distortions. A comparison of our scheme with other transform domain schemes is also provided along with the simulation results.