Digital watermarking of visual data: State of the art and new trends

The state of the art in digital watermarking of visual data is briefly reviewed. A communication perspective is adopted to identify the main issues in digital watermarking and to present the most common solutions adopted by the research community. We first consider the various approaches to watermark embedding and hiding. The communication channel is then taken into account, and the main research trends in attack modeling are overviewed. Particular attention is paid to watermark recovery due to the impact it has on the final reliability of the whole watermarking system. In the last part of the work the most crucial issues that still need to be solved are outlined, and some highlights on current and future research trends given.