本文用matlab实现了指纹图像的对比度增强、有效区域的选取、指纹图像的二值化、指纹的特征值提取等。并选取较好的处理步骤和算法参数解决指纹图像预处理的问题。-Using matlab fingerprint image contrast enhancement, selection of effective regional, the binarization of fingerprint images, fingerprint eigenvalue extraction. And select the better the processing steps and the algorithm parameters to solve the problem of fingerprint image.