基于混沌与细胞自动机的数字水印模式

本文提出了基于混沌与细胞自动机的数字自动转化为灰度图像的方法.数字作为密钥,不同数字能产生不同的灰度图像,其实现过程为数字作为种子,使用混沌迭代产生随机序列,然后转化成二值图像,经细胞自动机处理,再使用平滑过程,这样就产生了灰度图像.灰度图像作为嵌入宿主信号的数字水印模式,该水印模式的能量集中在低频.实验结果显示该水印模式有好的特性,使用该水印模式的水印算法能抵抗一些常见的攻击.

Digital Watermarking Pattern Based on Chaos and Cellular Automata

In this paper, an algorithm which automatically transforms number to gray-image using the number as key is proposed, distinct number leading to distinct gray-image. Its implementation is that random sequence is made by chaotic iterations using number as seed,then the sequence is transformed to two-value image. By cellular automata processing and after smoothing operation the gray-image is generated. The gray-image is regarded as a digital watermarking pattern and the pattern has most of its power concentrated in low frequencies.The watermarking is embbed into original image in spatial apace, and it is detected by using DCT.The experiment results show that the pattern has good property.The watermarking algorithm based on the pattern can resist some usual attacks.