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中文摘要：
提出通过变换域进行指纹图像增强，对指纹图像进行多尺度多方向的Contourlet变换，通过估计噪声方差水平，对Contourlet变换域系数进行处理，保护边缘特征系数，抑制噪声系数，反变换重建达到去除噪声、增强图像的目的。实验结果表明算法效果良好。
英文摘要：
In this paper we presents a method of processing in transform space for fingerprint enhancement,The algorithm performs Contourlet transform on fingerprint image then disposes the transformed coefficients by estimating the standard deviation of noises.Coefficients associated to edge is preserved while coefficients associated to noises is restrained.So enhanced fingerprint is obtained when transforming these changed coefficients back to spatial domain.The experiment results prove that proposed algorithm is responsible.
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