抛开别的，现在只说细化。

细化的目的是把图像变成单像素宽。



单像素宽的定义如下：

在8邻域内最多不超过3个临接点。

端点处一个，连续点处2个，分叉点处3个



可是如果这样定义，那么这样的图形无法细化了：

图像是一个叉子，因为交点所在的8邻域是有4个临界点的

这样的图像是无法变成单像素宽的

-Set aside other, and now only refinement. The purpose is to refine the image into a single pixel wide. Single pixel width is defined as follows: in the 8 neighborhood of up to more than 3 clinical contact. Endpoint Department one of two consecutive points, bifurcation points 3 However, if such a definition, then this kind of graphics can not be refined: the image is a fork, because the point of intersection where the 8-neighborhood is the critical point 4 of this images can not be turned into a single pixel wide