本文详细介绍了指纹识别技术的预处理算法，其中包括MATLAB算法仿真部分和DSP实现部分，并着重研究了预处理算法中的指纹图像归一化、图象滤波增强、图像分割、二值化、细化等关键技术。本文提出了改进的Gabor滤波算法，同时对其他预处理部分算法进行了优化，并将傅立叶分析方法应用于指纹图象处理研究中，采用MATLAB实现了本文讨论的所有算法。-This paper describes a fingerprint recognition algorithm technologies, including part of MATLAB simulation and DSP algorithms to achieve part of, and focus on the pre-processing algorithm of fingerprint image normalization, image enhancement filter, image segmentation, binarization, refining and other key technologies. In this paper, the Gabor filtering algorithm to improve at the same time some of the other pre-processing algorithm optimization, and Fourier analysis method has been applied to study of fingerprint image processing using MATLAB realized all the algorithms discussed in this paper.