最后以滤波窗口内像素的灰度排序均值(ROM)替换噪声点的灰度值。

If it is a noise point, the value is replaced by rank-ordered mean (ROM) of the filter window during noise removal.

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然后各子图内像素灰度值以低阶多项式表示，依最小二乘准则以多项式逼近原图像的子图像。

Then, the image grey level of every subimage is approximated by low-order polynomial according to least-square criterion.

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然后各子图内像素灰度值以低阶多项式表示，依最小二乘准则以多项式逼近原图像的子图像。

Then, the image grey level of every subimage is approximated by low-order polynomial according to least-square criterion.

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