A technique for digital watermarking in combined spatial and transform domains using chaotic maps

In this paper, the problems of robustness and quantity of embedded watermark of digital watermarking linked with independent spatial and frequency domains have been analysed. In attempt to overcome these problems to some extent, we have proposed a technique for watermarking in combined spatial and frequency domains based upon chaotic maps. By applying chaos effectively in secure communication, the strength (robustness) of overall anticipated algorithm has been increased to a significant level. In addition, few security statistical analyses such as correlation, entropy, energy, contrast, homogeneity, mean square error and peak signal to noise ratio have also been carried out and it is shown through confidence measure that it can survive against unintentional attacks such as addition of noise, compression and cropping.