一种基于混沌的新型扩频盲水印算法研究

论文提出了一种新型的DCT域扩频盲水印算法。通过将水印进行扩频调制，嵌入在载体图像的中频部分，大大提高了水印算法的稳健性；同时利用混沌算法将水印在嵌入前打乱，能大大提高隐蔽载体的鲁棒性和安全性。水印提取不需要原始载体图像，具有广泛的实用价值。实验证明该算法能抵抗常见的攻击，抗噪声攻击和JPEG压缩性能理想。

New Blind Watermarking Algorithm Based on Spread Spectrum and Chaotic Encryption Technique

This paper proposes a new blind watermarking algorithm based on spread spectrum technique in DCT domain. This method modulates watermarking by spread spectrum and embeds watermarking in medium frequency of vector image, this greatly improving the stability of the algorithm. At the same time, watermarking is encrypted and scrambled by chaotic algorithm before the embedding so as to improve security and robustness of the watermarking. Watermarking extraction does not require the original vector image, so this method is of great has a wide range of practical value. The experimental results indicate that the algorithm is resistant to many common attacks, such as noise addition, and with ideal JPEG lossy compression.