说明：  该算法是求取指纹图像的点方向和块方向的，得到指纹的方向信息，用matlab7.0编写，希望对初学者有些帮助
(The algorithm is to strike a fingerprint image of the point of direction and block direction, the direction of the fingerprint information, matlab7.0 prepared with the hope that some help for beginners)