基于Contourlet域能量和交换系数的图像水印算法

An Image Watermark Algorithm Based on Contourlet the Territory Energy and Exchange Coefficient

充分利用Contourlet变换特性,根据图像分解后的能量大小选择嵌入水印的方向图,并通过交换系数的嵌入算法,将水印信息嵌入载体图像。在数字水印的嵌入过程中使用了Contourlet分解载体图像的层数、每层分解的方向数和嵌入水印信息选择的子带3个密匙,具有较高的安全性。实验结果表明,该算法能够抵抗多种常见图像处理和几何变换的攻击,攻击后的图像中,均能够提取出较为完整的水印信息。

The algorithm makes full use of Contourlet transformation.According to energy after decomposition,the image size is selected to embed the watermark pattern,and the embedded algorithm exchange coefficients,the watermark embedded in the carrier image.The process of embedding digital watermark using the Contourlet decomposition of the carrier image layers,each layer decomposition direction number and embedding watermark information selected subband three key,higher security.The experimental results show that the algorithm can resist some common image processing and geometric attacks,the image after the attack,were able to extract the watermark information is complete.