An Adaptive DCT Domain Visible Watermarking Technique for Protection of Publicly Available Images

At present, with the growth of computer networks and information technology there is a trend to move from conventional libraries to digital libraries. In the digital libraries images and texts are made available through the internet for scholarly research. At the same time care is taken to prevent the unauthorized use of the images commercially. For this purpose the owner needs to use visible watermarking. In this paper, we describe a visible watermarking scheme that is applied into the host image in the DCT domain. A mathematical model has been developed for that purpose.