Image watermarking for copyright protection and data hiding via the Mojette transform

This paper describes a new methodology for image watermarking which is suitable both for copyright protection and for data hiding. The two presented algorithms are based upon the morphological mathematics properties of the Mojette Transform(1) (denoted as NIT in the following). The main properties of the Mojette transform are roughly recalled and the linked concept of phantom which depicts the null space of the operator is presented. Theses phantoms are implemented in the spatial domain giving the added watermarks. Then, two algorithms are presented based on this type of marks, the first one is devoted to the copyright embedding process and the second describes the steganographic scheme. Corresponding extractions of either the mark or the hidden message are then described. Finally, results are given in the last section for the two above schemes and robustness characteristics for the first scheme in terms of geometric attacks as well as the data hiding capacity for the second algorithm are discussed.