Abstract: The fingerprint image segmentation is one important part of the fingerprint-preprocessing，also is the step for the performance of the automatic fingerprint recognition.The paper introduces a sort of segmentation algorithm based on the reach of frequency domain by the DFT to the fingerprint image.The algorithm overcomes the limitation of the traditional method in using few texture information.Experimental results show significant effect to distinguish the foreground from the image.

Key words: fingerprint, image segmentation, texture, Discrete Fourier Transform（DFT）

摘要： 指纹图像分割是指纹图像预处理过程的重点之一，是实现后续处理的前题。通过对图像进行快速傅里叶变换，从频域角度对指纹图像纹理的研究，提出一套基于二维DFT的指纹分割算法。这种算法一定程度上克服了传统方法对指纹纹理信息利用不足的局限性，可以获得良好的分割效果。实验结果表明：算法对于剔除背景噪声和指纹图像中模糊区域有效，分割效果非常理想。

关键词: 指纹, 图像分割, 纹理, 离散傅里叶变换