基于双目视觉的接触线几何参数检测系统优化设计

Optimal Design of Geometric Parameter Measurement System of Contact Wires Based on Binocular Vision

传统的电力机车接触线几何参数人工检测方式危险大、效率低、不能满足频繁实时检测的需要。采用双目立体视觉技术,对接触线磨损面边缘点进行精确定位,从而实现其几何参数的在线测量,具有极大的优越性。但双目视觉测量系统不同的结构参数会影响空间目标的探测精度,因此对测量系统进行优化设计是十分必要的。运用误差传递理论推导了测量误差表达式,详细分析了测量精度与各参数之间的关系,结合测量实际要求,充分利用计算机仿真技术进行了结构参数的优化设计,同时对如何进一步提高测量精度提出了若干建议,为样机制作打下了很好的基础。

Traditional manual detection method for geometric parameters of the electric contact wires is dangerous and inefficient.It can not meet the needs for frequent real-time inspection.Binocular stereovision technology is very preferable that geometric parameters are automatically measured on-line when abrasion edge points of contact wires are positioned accurately.Yet different structural parameters of binocular vision measurement system will affect the detection accuracy of spatial targets.So optimizing the design of measurement system is necessary.The measurement error expression was derived based on error propagation theory and the relationship of measurement precision with parameters was analyzed in detail.The design of structural parameters was optimized by making full use of computer simulation technology and combined with actual requirements of measurement.A number of recommendations on how to further improve the measurement accuracy are proposed,providing a good basis for developing measurement system.