这个程序就是从联合开发网下载的，但是有一个错误导致识别率不足60%。
原始版本在图像旋转后提取的指纹中心点算法有误，每次提取的中心点都在图像边缘，造成后面提取的FingerCode也会出错。
这个修改使旋转前的中心点与旋转后的中心点保持一致，同时减少了运算复杂度(This program is downloaded from www.pudn.com, but one error led to recognition rate of less than 60%.
The original version of the extracted fingerprint center point after the image rotation is incorrect, and each extracted center point is at the edge of the image, resulting in the wrong FingerCode extracted later.
This modification keeps the center point before rotation consistent with the center point after rotation while reducing the computational complexity.)