基于对象的抗几何攻击的图像水印算法*

利用几何矩的仿射变换，提出了一种基于图像中重要对象的抗几何变换的数字水印算法。该算法先提取出图像的重要对象，然后将水印嵌入重要对象中，降低了对原始图像的修改，再利用质心对称的方式嵌入水印，减小了嵌入的水印对仿射系数造成的影响，改善了原有的几何矩仿射算法的抗几何攻击效果。实验结果表明该算法使得水印信息具有良好的不可见性、稳健性、抗背景剪切、抗旋转、缩放、平移等攻击特性。

Resisting geometric attacks image watermarking algorithm based on object

This paper proposed a watermarking algorithm based on objects which could resist geometric attacks.The algorithm utilized geometric matrix affine transformation. In order to decrease the modification of original image,firstly extracted the important objects in an image,then embedded the watermarking into them.The watermarking was embedded centroid-symmetrically to alleviate the effect of watermarking on affine coefficients, and also improved the robust to geometric attacks.Experimental results show that the proposed algorithm can make the embedded watermarking invisible and robust, and the algorithm also resists to various attacks such as background cropping, rotation, scale, translation etc.