指纹图像基于小波变换的各种处理进行了分析、总结。图像处理包括基于小波变换的指纹图像滤波处理和基于小波的指纹图像增强处理。同时介绍指纹图像的预处理：目的是去除指纹图像中的噪音，将其转化为一幅清晰的点线图，便于提取正确的指纹特征。它分四步进行，即灰度滤波、二值化、二值去噪、细化。(The fingerprint image is analyzed and summed up based on the various processing of wavelet transform. Image processing includes fingerprint image filtering based on wavelet transform and fingerprint image enhancement based on wavelet. At the same time, fingerprint image preprocessing is introduced. The purpose is to remove noise from fingerprint images, and transform it into a clear dot line graph, which is easy to extract the correct fingerprint features. It is carried out in four steps, namely, gray level filtering, two value, two value denoising and thinning.)