基于混沌序列的数字水印图像认证算法

本文在研究离散小波分解和混沌序列特点的基础上，提出了一种新的基于DWT域半脆弱水印算法。该算法以小波系数之间的关系作为水印信息，利用混沌映射产生一个密钥来加密水印信息，并分别嵌入到图像块深层小波域的低频子图中。水印的检测不需要原始图像。大量仿真结果证明，该算法嵌入的数字水印既具有很好的隐蔽性，又具有很理想的鲁棒性。

An Image Authentication Algorithm Based on Chaotic Sequences

Based on the research of discrete wavelet transform(DWT)and chaotic sequences,a new algorithm based on the wavelet domain of semi-fragile watermarking is proposed.The algorithm uses the relations of wavelet coefficients as the watermarking information,and utilizes chaotic sequences to generate a key which encrypts the watermarking information,and watermarks are embedded into the low-frequency coefficients of the wavelet domain.The experimental results demonstrate that the embedded watermarks are invisible,and this proposed watermarking algorithm is robust against many common attacks.