The method was based on a homeomorphic transformation of the infinity into the origin(linear singular point).
用一同胚变换将无穷远点转变成原点（初等奇点）。
This paper studies the essential differences of the two data models. It proposes the method of data transformation on the point of concept and proves the feasibility by examples.
本文通过研究这两种数据模型的本质区别，从概念角度提出数据转换的方法，并以实例验证其可行性。
Experiment results show that this method can find the correct feature point pairs under transformation and local distortion.
实验结果表明，该方法可以在变换与局部变形存在的情况下，正确判定两幅指纹之间对应的特征点。
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