一种基于harris角点的抗几何攻击的数字水印算法

Watermarking Algorithm for Digital Image Against Geometric Attacks Based on Harris Corner Detector

以在小波变换域提取出的harris角点为中心,提出了一种不依赖于同步性的抗几何攻击的水印算法。通过对水印模式结构进行精心设计,利用几个按照特定模式提取要求判别出的最大值点代表模式信号,嵌入水印信息;通过对依照模式结构提取出的最大值点进行判别,提取水印信息。该算法从根本上消除了对同步性的依赖,也不需要对图像进行区域剖分和规范化,大大节省了计算消耗。实验结果表明,该算法对抗平移、缩放、旋转等几何攻击,具有很好的鲁棒性。

A geometrically robust watermarking method, which is not sensitive to synchronization, is proposed based on the centers which were detected by Harris corner detector. The structure of watermark pattern is elaborately designed, and then finds some maximum points according to the pattern. Watermark information was embedded in these points. Finally, the information can be extracted by analyzes these points. This method＇s complexity reduces much because no additional work is needed to meet the synchronization requirement and no area partitioning and normalization are needed. Experimental results show that this scheme can robustly resist geometric attacks including rotating, scaling, translating and other geometric attacks.