注意：缩放的最大值与最小值可能取决于窗口与显示图像大小。

Note: maximum and minimum zoom values may depend on the size of the window and the displayed image.

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提出了椭园内接或外切多边形面积公式，并讨论了其面积达到最大值与最小值的条件。

In this paper, an area formula of polygon of inscribed or circumscribed ellipse is presented and the condition that the area reaches maximum value or minimum value is discussed.

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首先非线性堆滤波器用于求出图象某象素点邻域内的灰度最大值与最小值的最优估计，然后以此两估计值之差代替原象素点灰度值。

First, nonlinear stack filter is applied to estimate the maximum and minimum of noise-free image's gray scale value in a local region.

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