本论文主要对指纹图像质量的评估方法进行了研究。
This papers major work is the research on the methods of the estimation of the fingerprint image quality.
指纹预处理一般包括以下几个步骤：图像质量评估、均值滤波、灰度归一化、灰度均衡化、方向滤波、二值化以及细线化。
Image preprocessing is usually consisted of following steps: quality assessment, mean filtering, gray normalization, gray equalization, the Oriental filtering, binarization as well as thinning.
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