关键词: 零水印, 提升小波变换, 仿射不变特征点, 鲁棒性

Abstract:

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.

Key words: zerowatermarking;lifting wavelet transform;affine invariant feature points;robustness