基于频域线性拟合的数字水印算法

Rotation Resilient Watermarking Algorithm Based on Frequency Domain

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.