基于Contourlet域的抗几何攻击水印算法

Digital Watermarking Algorithm Against Geometric Attacks in Contourlet Domin

针对现阶段水印算法抗几何攻击性能差的特点,给出了一种基于Contourlet变换和几何归一化的数字水印方案。该方案首先利用图像归一化技术将原始载体映射到几何不变空间内,并提取出归一化图像的重要区域,然后对重要区域实施Contourlet变换,最后将水印信息嵌入到Contourlet域低频子带内。仿真实验结果表明,该数字图像水印方案不仅具有良好的透明性,而且具有较强的抵抗常规信号处理及几何攻击的能力。

Contrapose at the frailness of current algorithms which are not resistant to geometric attacks,a algorithm based on Contourlet transformation and geometric normalization is given. Firstly, the geometrically invariant space is constructed by using image normalization and the significant region is obtained from the normalized image by utilizing the invariant centroid theory. Then, the Contourlet transform is performed on the significant region. Finally, the digital watermark is embedded into the significant region.Experimental results show that the proposed scheme is not only invisible and robust against common signals processing, but also robust against the geometric distortion.