知识与财富的链接
在分析了现有的抗几何攻击的水印技术的基础上,提出了一种DFT DCT变换域下抗几何攻击,尤其是能有效地抗旋转攻击的数字水印算法。这种算法主要的特点是：方法简单、易于实现;不需添加模板和特征值;隐藏的信息量大;应用直线拟合实现图像经旋转后的配准;除了可以有效抵抗旋转攻击,还可以抵抗裁剪,以及伴随裁剪的旋转、压缩等攻击,具有较高的鲁棒性。
This paper gave the analysis of geometric distortion,and proposed a robust watermarking algorithm against geometric distortion,especially rotation distortion, based on frequency domain.This algorithm was simple and realized easily.It needn't embed template or eigenvalue.It could hide a large number of information.It could do image registration efficiently with beeline simulation.Besides rotation resilient,it was also robust against cropping,cropping with rotation and compressing.
