[9] [9] Girshickr, Donahue J, Darrell T, et al. Rich fea-ture hierarchies for accurate object detection and semantic seg-mentation [C]//2014 IEEE Conference on Computer Vision and Pattern Recognition. Columbus, USA. IEEE, 2014: 580-587.

[12] [12] Girshick R. Fast R-CNN [C]//2015 IEEE International Conference on Computer Vision (ICCV), December 7-13, 2015, Santiago, Chile. IEEE, 2016:1440-1448.

[13] [13] Ren S Q, He K M, Girshick R, Sun J. Faster R-CNN: Towards real-time object detection with region proposal networks 2015 IEEE Conference on Computer Vision and Pattern Recognition [C]//Boston, USA: IEEE, 2015: 91-99.

[14] [14] Redmon J, Divvala S, Girshick R, Farhadi A. You only look once: Unified, real-time object detection IEEE Conference on Computer Vision and Pattern Recognition [C]//Las Vegas, USA: IEEE, 2016:779-788.

[15] [15] Liu W, Anguelov D, Erhan D, Szegedy C, Reed S, Fu C Y, Berg A C. SSD: Single shot multibox detector European Comference on Computer Vision [C]//Amesterdam, Holland: ECCV, 2016: 21-37.