Digital Image Watermarking Based on U-System
基于U系统的数字图象水印技术

This paper present a novel easy and effective algorithm to plant digital watermark into digital images, this algorithm is different to general watermarking methods based on spread spectrum, because a new orthogonal base based on piecewise polynomial is constructed. The watermark based on this algorithm can resist energy loss caused by lose compression of digital image. In the first part of this pper, piecewise linear U system and its properties will be introduced respectively, corresponding graphs are shown, too. Following this part, how to generalize this algorithm to piecewise k degree U system is discussed; In the third part fo this paper, based on decompose digital image by piecewise linear U system, a kind of digital image watermarking scheme will be provided, the process of this algorithm is introduced step by step. By the end of this paper, some corresponding experimental results based on U system will be listed. The experimental results demonstrate the algorithm is reliable.