DBOW2做视觉SLAM中闭环用到的库，里面含有demo在windows基于opencv3.0.可运行. 可用于了解DBOW2词袋的使用和原理

orbslam2-windows依赖库dbow2，window编译的orbslam2，所有的库都是x64，debug，MDD，

In addition, download a vocabulary file for DBoW2 from here and uncompress it. You can find orb_vocab.dbow2 in the zip file.

OpenVSLAM的ORB词袋包。 OpenVSLAM is a monocular, stereo, and RGBD visual SLAM system. The notable features are: It is compatible with various type of camera models and can be easily customized for other camera models. Created maps can be stored and loaded, then OpenVSLAM can localize new images based on the prebuilt maps. The system is fully modular. It is designed by encapsulating several functions in separated components with easy-to-understand APIs. We provided some code snippets to understand the core functionalities of this system.