自动指纹识别系统主要包括以下几个步骤：指纹图像采集、指纹图像前处理、细节特征提取、指纹图像匹配。

The fingerprint recognition system mainly concludes the following steps: collection of fingerprints, pre-processing of fingerprint image, minutiae extraction and fingerprint matching.

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指纹匹配技术分为两种：基于细节点的匹配和基于纹线相关性的匹配。

There are two fingerprint matching technologies: matching based on minutia and matching based on the relation among ridges.

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为了克服指纹识别中的常见问题，提出了一种基于改进的相似三角形的指纹细节点匹配算法。

In order to overcome the common problem in fingerprint recognition, a fingerprint minutia matching algorithm based on improved similar triangle is proposed.

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