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1·A new approach of fingerprint classification based on the interested region of the orientation field is described.

提出了一种基于指纹方向场半区域指纹特征构造方法，并将此特征用于指纹分类。

2·To realize center point positioning of fingerprint, method of maximum curvature is widely used at present. But it is inaccurate when the center region of fingerprint has been lost or not clear.

目前广泛采用最大曲率方法实现指纹中心定位，但在指纹中心缺失情况下，该方法定位并不准确。

3·Minutiae extraction in fingerprint images based on 8 neighborhoods region coding pursue pixel method is studied and realized.

研究并实现基于8邻域编码逐像素跟踪法的细节特征提取算法。