【摘要】 提出了一种新的混沌序列扩频水印算法。该算法将混沌序列应用于水印嵌入算法的三个不同环节:水印密文的产生、子图像的选取以及DS-CDMA伪随机码的产生,使得混沌序列适用于噪声调制的统计特性得到充分应用。水印的提取利用了相关性检测。实验结果表明,该算法对于常用的信号处理攻击和几何变形攻击具有较高的鲁棒性。更多还原

【Abstract】 A new chaos-based spread spectrum watermarking algorithm is developed in the wavelet domain for still images. The algorithm makes full use of the properties of chaotic sequences in three ways: generating chaotic encrypted binary image watermarking signal, choosing subimage and generating DS-CDMA Pseudo-Random sequences. As usual, the watermark is detected by computing the correlation between the watermarked coefficients and the watermarking signals. Simulation results show that high fidelity and high robustness can be obtained under the attack of normal signal processing and geometric operations.更多还原