[5] [5] PING T,LI X F,XU J M,et al.Catenary insulator defect detection based on contour features and gray similarity matching[J].Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering),2020,21(1):64-73.

[6] [6] ZHANG G N,LIU Z G,HAN Y.Automatic recognition for catenary insulators of high-speed railway based on contourlet transform and Chan-Vese mode[J].Optik-International Journal for Light and Electron Optics，2016,127(1):215-221.

[8] [8] JI Y,ZHAO K,ZHANG K M,et al.An improved Faster R-CNN for devices detection inrailway 4C system［C］//38th China Control Conference,July 27-30,2019,Guangzhou,Guangdong,China.Beijing:Systems Engineering Society of China,2019:6.

[10] [10] REN S,HE K,GIRSHICK R,et al.Faster R-CNN:towards real-time object detection with region proposal networks[J].IEEE Transactions on Pattern Analysis & Machine Intelligence,2017,39(6):1137-1149.

[11] [11] RUSSAKOVSKY O,DENG J,SU H,et al.Image net large scale visual recognition challenge International Journal of Computer Vision[J].2015,115(3):211-252．

[12] [12] MAKOTO S,KUMAR P R,YOSHIKI K,et al.Improved iterative reconstruction method for compton imaging using median filter[J].PloSone,2020,15(3):22-36.