基于映射机制的遥感影像盲水印算法

针对遥感影像数据，提出一种基于映射机制的抵抗几何攻击的强抗差性盲水印算法。首先，采用随机序列发生器生成固定长度的伪随机二值序列作为水印信息；然后，建立影像数据与水印信息的映射函数，并对映射变量进行扩展，确定水印信息的嵌入位置；最后，采用基于映射机制的修改像素值位平面的水印嵌入规则进行水印嵌入。水印检测是水印嵌入的逆过程，采用多数原则确定水印信息。该方法克服传统抗几何攻击时要求攻击后影像的大小和像素相对位置保持不变的局限，有效扩充水印容量，具有好的抗差性和不可见性，并能保持影像精度特征和统计特性。

Blind Watermarking Algorithm Based on Mapping Mechanism for Remote Sensing Image

A blind watermarking algorithm resistance against the geometric attacks for remote sensing data is presented based on mapping mechanism.First,the pseudo-random binary sequence,which is generated by the random number generator,is used as the watermarking information.Then,the mapping function of the image data and watermark information is established,and the mapping variable is expanded,which can determine the watermark embedding position.Finally,the modified pixel value bit-plane,which is based on mapping mechanism,is used as the watermark embedded rules.Watermark detecting is the inverse process of watermark embedding,and the watermark information is determined by majority rule.The presented method overcomes the limitation that the image size and the pixel relative coordinate remain the same after the traditional attacking.The watermark capacity has been effectively expanded,and the presented method has good robustness,invisibility and maintains the accuracy of features and statistical properties of image.