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 al-gorithm based on pseudo-Zernike moments