【摘要】 提出了一种抵抗一般性几何攻击的数字水印新算法.该算法首先利用多尺度Harris检测算子从载体图像中提取出稳定的特征点;然后根据特征尺度自适应确定局部特征区域,并对其实施归一化处理;最后结合预失真补偿理论,采纳DFT中频幅值比较策略将水印信息重复嵌入到多个归一化局部特征区域内.仿真实验表明,本文算法不仅具有较好的透明性,而且对常规信号处理和一般性几何攻击均具有较好的鲁棒性.更多还原

【Abstract】 A new feature-based image watermarking scheme robust to unclassified geometric attacks is proposed in this paper.Firstly,the multiscale Harris detector is utilized to extract steady feature points from the host image;then,the local feature regions(LFR)are ascertained adaptively according to the feature scale theory,and they are normalized by normalization technique;finally,according to the predistortion compensation theory,several copies of the digital watermark are embedded into the nonoverlapped normalized LFR by comparing the DFT mid-frequency magnitudes.Experimental results show that the proposed scheme is not only invisible,but also robust against common signals processing and unclassified geometric attacks.更多还原