The article aims at improving the situation that in the 2D measurement of damaged wheels it is too inefficient and inaccurate if done manually or through contact measurement, brings forward 2D contactless measurement by CCD, which will enable the automatic measurement of damaged wheels online to come true. First, get the image of the wheel tread through CCD system, from which we can pick up the fringe of the tread, calculate the outline of the tread through the method of curve fitting. After labeling we can gain the dimension. Compared the outline of the damaged wheel with that of standard wheel, calculated the economical outline of the wheel that the machining can recover, and then auto-programmed according to the image, the damaged wheel can be repaired in CDC lathe efficiently.
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