In the filed of computer vision and image processing, the characteristic parameters such as the center coordinates and radiusof circle and arc parts often need to be measured by their images.
在计算机视觉和图像处理中，经常需要根据圆孔或圆弧的图像求取其中心坐标和半径等特征参数。
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For more stability for the (vision) navigation and docking of lunar rovers, the lunar rover model with two parallel wheels was designed which has changeable driving radius.