在三角剖分种去掉内环，需要判断点、线段、三角形与多变形的关系。这个模块提供这样的功能。-Species in the triangulation to remove the inner ring, you need to determine the point, line, triangle and polygon of relationships. This module provides this functionality.

去掉图像的噪音的一个不错的事例,值得大家参考 不错的源码(Remove the noise of the image of a good example, worth reference source)