指纹图像预处理与特征提取是指纹识别的前提，本文提供指纹图像预处理算法, 并给出了指纹特征提取及其后处理算法及其参考文献。-Fingerprint image preprocessing and feature extraction is a prerequisite for fingerprint recognition, fingerprint image pre-processing algorithm in this article, and gives the fingerprint f