一种基于共轭混沌映射的数字水印算法研究

数字水印技术在多媒体方面有着广泛的应用，其中最受关注，同时也是要求最高的应用是用于版权保护的数字水印技术。本文提出了一种基于共轭的抗剪切鲁棒水印算法，运用一类标准混沌映射，构造了一种具有强非线性藕合的置换方式，从而改变水印图像像素点的位置，利用共轭映射产生密钥流改变载体图像的灰度值，然后对水印进行嵌入。实验结果证明该方案具有可行性、鲁棒性和安全性。

A Novel Watermarking Algorithm Based on Coupled Chaotic Map

Digital watermarking is widely used for a variety of multimedia applications, of which technique aiming at copyright protection is the most difficult as well as attractive. In this paper, a robust digital watermark algorithm based on coupled chaotic map is proposed. First, the original binary watermark is permuted by standard chaotic map, and the grey value of original image is masked according the coupled map. Then, the permuted watermark is embedded in the masked original image. Simulation results have demonstrated that this scheme is practical, secure and robust.