基于Contourlet变换的遥感影像数字水印方案

针对现有变换域遥感影像数字水印算法存在的问题,提出一种基于Contourlet变换的遥感影像数字水印方案。算法首先对宿主遥感影像进行图像归一化;然后,对水印图像进行Arnold置乱预处理,并将置乱后的水印图像利用行扫描形成一维向量,得到二值水印序列作为数字水印信息;最后对宿主遥感影像进行Contourlet变换,并通过奇偶量化将水印嵌入所选Contourlet变换系数中。实验证明该算法对JEPG压缩、滤波和噪声以及旋转、缩放、平移等几何攻击均具有较好的鲁棒性。

A WATERMARKING SCHEME FOR REMOTE SENSING IMAGES BASED ON CONTOURLET TRANSFORMATION

Against problems of existing transformation domain watermarking algorithms for remote sensing images,the paper proposes a digital watermarking scheme for remote sensing images based on Contourlet transformation.At first,it normalizes a host remote sensing image.Then it scrambles the watermark image by Arnold;through line scanning the scrambling watermark image into one-dimensional vector,it uses the acquired binary watermark sequence as digital watermark information.Finally,it applies Contourlet transformation to the host remote sensing image and embeds the watermark into the selected Contourlet transformation coefficients by quantitative parity.Experiments have shown the algorithm’s good robustness against JPEG compression,filtering and noise attacking,as well as against geometric attacks such as rotation,scaling,and moving etc.