Description: 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
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