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给出了基于小波变换的多尺度边缘表示方法及其对一般的图像信号表示的完备性和相应重建算法的稳定性，然后在小波变换的多尺度极大值表示方法的基础上，提出在尺度空间中基于多种知识的指纹图像非线性滤波方法．实验表明，这类滤波方法具有很强的自适应性，能取得令人满意的效果．
The multi-scale edge representation method based on wavelet transform and its completeness to the general image signal representation and the stability of the corresponding reconstruction algorithm are given. Based on the wavelet transform multi-scale maximum value representation method, Fingerprint Image Nonlinear Filtering Method Based on Multi - knowledge in Space. Experiments show that this kind of filtering method has strong self-adaptability and can achieve satisfactory results.