在对原图像进行双正交7／9三级小波分解后 ，在第二级的水平、垂直直、对角和第三级对角分量上加入水印系数，再经过小波反变换重构出图像。

-After the original image biorthogonal 7/9 three wavelet decomposition, at the level of the second stage, the vertical straight, diagonal and the third stage, added to the angular component the watermark coefficient, then after the inverse wavelet transform Reconstruction image .