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.

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；

youdao

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.

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；

youdao