基于图像仿射不变特征点的零水印算法

本文提出了一种基于图像提升小波变换和仿射不变特征点的零水印算法。首先对图像进行3级提升小波变换,然后在低频部分,利用Harris-Affine算子提取出图像的仿射不变特征点和仿射协变特征区域,利用这些特征区域来构造零水印信息。实验证明,该算法不仅对常规信号处理攻击和简单的几何攻击具有很强的鲁棒性,对于剪切、纵横比改变、行列去除,局部扭曲等较复杂的几何攻击也具有较强的抵抗能力。

A Zero-Watermarking Algorithm Based on Image Affine Invariant Feature Points

This paper proposes an image zero-watermarking algorithm based on lifting scheme wavelet and affine invariant feature points.The image is firstly decomposed by three-level lifting wavelet transformation,and then the affine invariant feature points and affine covariant feature regions are extracted from the low frequency subband by utilizing the Harris-Affine point detector,with which the zero-watermarking information is constructed.It is demonstrated by the experiments that the proposed algorithm is not only robust against common image processing operations and simple geometric attacks,but also with strong resistance to complex geometric attacks such as shearing,aspect ratio change,row or column removal,local distortion,etc.