有了这些工具，你可以绘制轮廓并编辑它们。

With these tools you can draw the contours and edit them.

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第一个参数表示输入图像，函数将在这张图像上绘制轮廓。

Image where the contours are to be drawn. Like in any other drawing function, the contours are clipped with the ROI.

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你可以方便的在图像上绘制轮廓来注释，而且可以通过KML或KMZ文件共享这些覆盖图。

You can easily sketch figures on the imagery for richer annotations and can share these overlays as KML or KMZ files.

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