第三章是对指纹细化方法的研究。
The third chapter is the research in the fingerprint thinning.
因此，该算法是一种较为理想的指纹细化方法。
So, this algorithm is a kind of comparatively ideal thinning method of fingerprint.
预处理部分涉及到指纹有效区域的提取、指纹图的增强和指纹细化。
Fingerprint Preprocess includes Fingerprint Foreground Extraction, Image Enhancement and Thinning.
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