基于交比不变性的绝缘子串中轴线提取方法

Axle wire extraction method of insulator strings based on the cross ratio invariance

鉴于绝缘子串沿其中轴线剖面计算其爬电距离的需要,提出一种基于交比不变性的绝缘子串中轴线提取方法。首先利用Kinect扫描获取整个绝缘子串点云数据,并根据马氏距离判别剔除其中心数据保留伞裙数据;接着依据绝缘子串各伞裙间存在的交比不变性原理,对其中轴线的方向向量进行受限估计;最后进一步利用交比不变性质来拟合各伞裙的圆心,获取具有全局最优的绝缘子串中轴线方程。实验结果表明,本方法所估计的中轴线方程具有全局最优且准确高效,为后续爬电距离计算提供了有效支撑。

Because of the insulator string creepage distance calculation needs to along one axis section,in this paper,a method of extract axle wire of insulator strings based on the cross ratio invariance is proposed.Firstly,the point cloud data are obtained by Kinect,then on the basis of the Mahalanobis distance discriminant method to eliminate the center data and retainthe umbrella skirt data;Secondly,according to the cross-ratio invariancebetween the umbrella skirtof insulator strings,the direction vector of axle wire is limited to estimate;Finally,we fitting the centers of the umbrella skirt in cross-ratio invariance,and the global optimal equation of the central axis of insulator string is obtained.The experimental results show that,our method can extract a the global optimal,accurate and efficient central axis,and it will provide effective support for subsequent creepage distance measurement.