The replacing of mechanic scan with electric scanningoneline probes controlled by a computer to realize flaw detection of twin train wheels is introduced.
描述了由计算机控制探头阵列电扫描对列车轮对探伤工作模式，以取代机械扫描方式。
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The height of one section of the object surface can be obtained after computing the pixel coordinates of the light line, and the whole 3d shape can be got with a one-dimension scanning rig.
The paper gives out a method to combine non-convex figures into a convex one, a method to get bumping region by using NFP, and a scanning-line method to search the gaps among adjacent figures;