显示了如何从细化后的指纹图像中获得细节点集合。代码由C写成。详细情况见解包后的说明-shows how detailed the fingerprint image details were set point. Written by C code. Details of the opinion after the note packets

Another advantage is that geometric properties of the curve are easily determined from a particular level set of the surface . For example, the normal vector for any point on the curve C is given by: