在此基础上提出了一种基于边缘分析的二值化算法的投影判断法。
A thresholding method is proposed based on edge analysis combined with projection technique.
自适应局部阈值二值化算法，其效果主要取决于能否准确地估计局部阈值。
The effect of the self-adapt local threshold for fingerprint image is mainly determined by the estimate accuracy of the local threshold.
在方向图和脊线频率的基础上，实现了基于二阶导数的指纹图像二值化算法；
We also improve on the binarization method of fingerprint images based on the 2~(nd) derivative by the orientation and ridge frequency of the images.
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