Secondly, use median filtering method to get inverse wavelet estimation in inverse domain.

其次，在逆子波域采用中值滤波，提取接近真实逆子波的逆子波估计；

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Finally, the marked virtual images are gotten with inverse wavelet transform and a new group of control points is obtained based on the pixel value of the virtual image.

最后，进行小波逆变换，得到含有水印信息的虚拟图像，根据虚拟图像中的象素值就可以得到一组新的控制顶点坐标。

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Then, watershed segmentation of the approximation image is computed, and the inverse wavelet transform is used to project this original segmentation up to the higher resolutions.

对近似图像进行分水岭分割，并且用小波逆变换把原始分割结果逐步映射回更高的分辨率层。

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