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The parameters of circular arc of a rounded cutter affects the machining precision, surface roughness and cutter durability. Accuracy requirements of grinding and measuring of a cutter has reached micron order or even submicron. At present, the main problem is different background noises and unconspicuous transition of arc-edge and linear-edge. The paper introduces morphologic closing operation for noise reduction, uses circle determination with three points in the sliding window for rough location of the arc, and adopts spatial moment for sub-pixel precision. The results show that the proposed method is robust, and the separation of arc and line is fast and accurate for cutters of radius from 0.2mm to 0.8mm. The precision of arc radius and roundness error is submicron order, and the precision of arc angle is 0.1 degress.