They are average value filtering, medium value filtering, math morphologic operations including unlock operation and close operation and how to extracting image's contour line, skeleton, and so on.
例如均值、中值、滤波过程，数学形态学运算中的开启、闭合，以及图像的轮廓线、骨架线的提取技术等。
Different morphologic arithmetic, which forms a morphologic filter namely morphologic operator, could get different result of filtering.
采用不同的形态运算所构成的不同形态滤波器，其滤波效果是不同的。
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