This paper presents the using methods of combing limit range filter with middle value filter and average value filter and how to determine the sampling interval of the digital filters.
本文提出限幅滤波和中值滤波、均值滤波相结合使用的方法，并提出如何确定数字滤波器采样信号的采样间隔。
A key difference is that this algorithm does not give the same value at the sampling point but gives the same average value in unit area of each pixel.
此算法的关键不同点在于不是让算法结果在采样点的值等于原采样值，而是在一个象素大小的单位面积上得到的平均值等于原采样值。
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