Update README.md

Hello-Water · Aug 14, 2020 · 6fcbfe3 · 6fcbfe3
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 [地图保存2](https://github.com/XinkeAE/Active-ORB-SLAM2/blob/master/src/Map.cc)
 
+[[ORB-SLAM2] ORB-SLAM中的ORB特征（提取）](https://zhuanlan.zhihu.com/p/61738607) 
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 > 动态环境处理
 
 [dynslam 光流运动  语义分割](http://www.cvlibs.net/publications/Barsan2018ICRA.pdf) 
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 [Probabilistic Data Association for Semantic SLAM](https://www.cis.upenn.edu/~kostas/mypub.dir/bowman17icra.pdf) 
 
 [VSO: Visual Semantic Odometry](https://demuc.de/papers/lianos2018vso.pdf) 
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 # 感谢支持