网络上流传的图像细化算法只有一种，效果也不是很好，这是本人辛苦搜罗来的另外四种图像细化算法，供大家尝试研究-The network popular image thinning algorithm only one, the effect is not very good, this is my hard work to collect the other four types of image thinning algorithm for the U.S. tries to study the