借助弱纹理匹配的TEDS车底故障区域定位算法

TEDS underbody fault location algorithm in virtue of weak texture matching

针对当前动车组运行故障动态图像检测系统(trouble of moving EMU detection system,TEDS)故障识别准确率低的问题,本文提出一种借助弱纹理匹配的动车底部潜在故障区域定位方法。首先,采用拓扑交叉数检测大量弱纹理区域特征点;然后,以特征点为中心的环形区域内各像素点的拓扑交叉数值筛选特征点,构建相应特征向量进行弱纹理特征匹配;最后,对配准后的图像进行比对定位潜在故障区域。实验结果表明,该算法保证了匹配精度,能检测出大部分潜在故障区域,弱纹理区域的特征匹配准确率超过80%且所有图像对均存在特征匹配对,为以后的精准故障分类提供了有利条件。

Fault recognition accuracy in the trouble of moving EMU detection system(TEDS)is suboptimal.Thus,a method for locating potential fault areas at the bottom of EMU by means of weak texture matching is proposed.First,a large number of feature points in the weak texture areas are detected using the topological crossover number.Second,feature points are selected on the basis of the topological crossover number of each pixel within a specified ring area centered on the feature points.This approach aims to construct corresponding feature vectors to achieve the matching of weak texture features.Finally,the registered image is compared to locate the potential fault areas.Experimental results show that the algorithm ensures matching accuracy;it can also detect most potential fault areas.The matching accuracy of weak texture areas is more than 80%,with feature matching pairs in all image pairs.Such a result provides favorable conditions for accurate fault classification in the future.