分组法求点方向图，邻域方向模板法求点方向图（也称B.M.Mehtr法），切缝法求点方向图，改进方法求点方向图，由改进方法得到的点方向图求连续分布方向图-Grouping method the dot pattern, the direction of the template method the neighborhood point pattern slit method the dot pattern, the direction　the point of improved methods of FIG seeking continuous distribution pattern, the fingerprint dot pattern blocks to solve the fingerprint pattern