Frequency domain chaotic watermarking
Alessandra Giovanardi, G. Mazzini · 2002
A watermarking procedure to be applied in the frequency domain to digital images has been proposed and investigated, with purpose of copyright protection. The selected digital signature is a chaotic sequence embedded by considering a shaping function to weight in different manner each sequence value, as a function of the image properties in the frequency domain. The shaping function proposed permits one to enhance the robustness of the watermarking to attacks like the JPEG one. Numerical results show the validity of the proposed approach and of the use of particular classes of chaotic maps.