An Algorithm for Digital Watermarking Based on Fractal Coding
Zou Bei · Computer Engineering and Science · 2005
This paper presents a new attacking scheme on digital watermarking systems based on fractal coding. In this scheme, the image blocks marked with particular watermarking information are substituted by the other parts of image in the form of contracted mapping. The watermarking information in the contracted mapping has little correlation with that in the original blocks. An attack experiment on a multiresolution decomposition based watermarking algorithm is given, and the in ffluence on image quality is analyzed. Experimental results show that the extracted correlation decreases remarkably after the attack.