The detection of missing track fasteners is an important part of daily inspection of the railway. Owing to the new requirements of realtime and self adaptation of the automatic detection technology, a method of realtime detection of missing track fasteners based on machine vision is proposed in this paper. In order to deal with the interference of environmental light, the image acquisition device includes hood and lightemitting diode (LED) auxiliary light source. The switching median filtering is used and the Canny edge detection is improved based on image gradient amplitude for image adaptive enhancement of the characteristics of fastener edges. The feature of article fasteners to play in stable boundary and the projection curve characteristics of template matching are combined to realize the realtime detection of missing fasteners. Experimental results showed that the image detection time of every frame is 245.61ms, the average of ecognition accuracy is 85.8%. The highest speed of real time detection of missing fastener of actual operation line is 3.82m/s. These results suggest that the proposed method is adaptive.
MIN Yongzhi1,XIAO Benyu1,DANG Jianwu1,YIN Chao1,YUE Biao1,MA Hongfeng2
. Machine Vision Rapid Detection Method of the Track Fasteners Missing[J]. Journal of Shanghai Jiaotong University, 2017
, 51(10)
: 1268
-1272
.
DOI: 10.16183/j.cnki.jsjtu.2017.10.017
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