提出了一种基于水平集方法的多比特顽健水印算法.该算法首先利用水平集方法在图像中确定一个稳定的图像轮廓,进而确定一个位置稳定的单位圆,然后计算这个单位圆的伪Zernike矩,利用抖动量化的方法将水印嵌入伪Zernike矩的幅值上.水印的检测过程采用均方根误差法提取出水印.克服了传统基于伪Zernike矩水印算法的缺点,同时可以很好地抵抗各种几何攻击.%A multibit watermarking algorithm based on level set method was proposed. First, the stable location of the unit disk was found using level set method. Then, pseudo-Zernike moments were calculated. At last, the watermark was embedded by modifying the pseudo-Zernike moments. In the extraction process, the root-mean-square-error method was employed to detect the watermark. Simulation results show that the algorithm overcomes the defect of the traditional algorithm based on pseudo-Zernike moments, while be robust against geometric attacks.
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