在椭圆边缘粗定位的基础上,根据椭圆粗定位信息及图像边缘梯度方向附近点的灰度分布特征,进行高斯拟合获取精确的亚像素边缘点,对亚像素边缘点进行最小二乘拟合,得到精确的椭圆中心位置。实验证明,该算法对椭圆中心定位精度和稳定性有较大提高,并有很好的实时性。

Based on coarse positioning information of the ellipse and gray distribution features of the point near the image edge of gradient direction, Gauss fitting is used to obtain accurate sub-pixel edge points. By using the least-square fitting of the sub-pixel edge, the ellipse′s center position is obtained. Experimental results proved the efficiency and stability of the algorithm to ellipse center accurate positioning, and has a good real-time performance.