指纹图像的周期性和局部方向性是指纹图像的重要结构特征，充分利用这两个结构特征是提高指纹增强算法的重要方法。
Periods and local direction of fingerprint image are the important structure characters. The two characters of structure are important in the fingerprint enhancement.
第二章详细分析了自动指纹识别系统的结构及工作流程，并对嵌入式自动指纹识别系统专门进行了研究。
In the second chapter, the structure and work procedure of AFIS, especially embedded AFIS, are analyzed in detail.
根据指纹模式的不同，指纹匹配可以分为基于细节点的匹配和基于结构的匹配。
The coordinates and the orientations of the minutia are utilized for identification in matching algorithm based on minutiae.
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