细化算法通常和骨骼化、骨架化算法是相同的意思，也就是thin算法或者skeleton算法,该代码细化效果不错-Louisa Lam, Seong-Whan Lee, Ching Y. Suen，“Thinning Methodologies-A Comprehensive Survey ”，IEEE TRANSACTIONS ON PATTERN ANALYSIS AND MACHINE INTELLIGENCE, VOL. 14, NO. 9, SEPTEMBER 1992