IOU、mAP等

https://www.zhihu.com/question/53405779/answer/394311144

SPPNet

https://blog.csdn.net/yzf0011/article/details/75212513
http://www.mamicode.com/info-detail-2222982.html
https://blog.csdn.net/u012938704/article/details/71185126

原始图片中的ROI如何映射到到feature map?

https://zhuanlan.zhihu.com/p/24780433

ROI Pooling层详解

https://blog.csdn.net/auto1993/article/details/78514071

faster-rcnn 之 RPN网络的结构解析

https://blog.csdn.net/sloanqin/article/details/51545125

R-FCN论文阅读（R-FCN: Object Detection via Region-based Fully Convolutional Networks ）

https://blog.csdn.net/baidu_32173921/article/details/71741970