A novel watermarking scheme on resistance to scaling

In this paper, the effect of scaling on the watermark detector is analyzed. A novel idea, watermark normalization is proposed. The original message pattern is generated with a standard and large size. When embedding, the message pattern is suited into the same size as the cover data by the sampling with equal intervals. The same operation is also applied before watermark detecting. As a result, the pixel-pixel mapping relation between message pattern and the cover data is changed slightly by scaling. So the synchronization of detector can be implemented. Experimental results show it is effective on resistance to scaling.