指纹图象的预处理方法
Some Preprocessing Methods for Finger-Print Image
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摘要: 本文提出了两种指纹图象的预处理方法.第一种方法采用动态门限检测指纹的隆线,直 接给出二值化图象.第二种方法包括三个步骤.首先利用图象的局部统计特征消除低频灰度 干扰,然后用模板匹配法增强指纹隆线,抑制高频噪声,最后进行二值化.Abstract: Two preprocessing methods for finger-print images are presented in this paper. In the first method, a dynamic threshold is used to detect the finger-print lines and get a bilevel image directly. There are three steps in the second method. The low frequency grey ]evel disturbance is eliminated by use of local statistics. Then the finger-print lines are enhanced and the high frequency noise is attenuated by matching masks. Finally, the image is transformed into a bilevel version.
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