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将二元形状缩减为 1 像素宽的骨架。对于形状分析、手写识别和拓扑提取很有用。
使用Zhang-Suen 或Guo-Hall 细化将二元形状骨架化为1 像素宽的中心线，以进行OCR 和形状分析。
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Thinning reduces a binary shape to a 1-pixel-wide representation (skeleton) while preserving the topology and connectivity. It is the morphological equivalent of finding the
Zhang-Suen is the classic iterative algorithm and works well for most shapes. Guo-Hall is a one-pass variant that can produce slightly different skeletons — it is faster but may leave more staircase artifacts.