Drawing Contours 绘制轮廓
The NCAR Graphics home page provides a stable UNIX package for drawing contours, maps, surfaces, weather maps, x-y plots, and many others.
NCAR Graphics主页提供了一个稳定的UNIX包用来绘制轮廓图、地图、表面图、气象图、x - y图以及很多其他图形。
Image where the contours are to be drawn. Like in any other drawing function, the contours are clipped with the ROI.
第一个参数表示输入图像，函数将在这张图像上绘制轮廓。
Grid contouring is one of methods often used for drawing depth contours by computers.
规则网格法是计算机绘制等值线的常用方法之一。
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