LVI-SAM-CC_Comments

Introduction

本仓库是 LVI-SAM 的粗略中文注释。

• LVI-SAM是由 LIO-SAM 和 VINS-Mono组合而成，本仓库只是对LVI-SAM的简答注释，关于其中LIO-SAM和VINS-Mono两部分的详细注释，在另外两个repo中： LIO-SAM-CC_Comments 和 VINS-Mono-CC_Comments
• 原版 LVI-SAM 坐标系定义较为复杂和混乱，我仔细分析了LVI-SAM中的坐标系定义，并重新修改了外参部分代码，让外参配置更简单。修改后的代码在另一个repo中：LVI-SAM-Easyused

Done

• 从 LVI_SAM_gld clone下来，粗略过一遍代码框架

TODO

• 整理注释格式，遵循自己使用的Todotree的注释颜色配置
• 整理 LIO-SAM-CC_Comments 和 VINS-Mono-CC_Comments 的详细中文注释到本工程中

Acknowledgements

• LVI_SAM_gld
• LVI-SAM

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LVI-SAM

This repository contains code for a lidar-visual-inertial odometry and mapping system, which combines the advantages of LIO-SAM and Vins-Mono at a system level.

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Dependency

• ROS (Tested with kinetic and melodic)
• gtsam (Georgia Tech Smoothing and Mapping library)

  wget -O ~/Downloads/gtsam.zip https://github.com/borglab/gtsam/archive/4.0.2.zip
  cd ~/Downloads/ && unzip gtsam.zip -d ~/Downloads/
  cd ~/Downloads/gtsam-4.0.2/
  mkdir build && cd build
  cmake -DGTSAM_BUILD_WITH_MARCH_NATIVE=OFF ..
  sudo make install -j4
  

• Ceres (C++ library for modeling and solving large, complicated optimization problems)

  sudo apt-get install -y libgoogle-glog-dev
  sudo apt-get install -y libatlas-base-dev
  wget -O ~/Downloads/ceres.zip https://github.com/ceres-solver/ceres-solver/archive/1.14.0.zip
  cd ~/Downloads/ && unzip ceres.zip -d ~/Downloads/
  cd ~/Downloads/ceres-solver-1.14.0
  mkdir ceres-bin && cd ceres-bin
  cmake ..
  sudo make install -j4
  

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Compile

You can use the following commands to download and compile the package.

cd ~/catkin_ws/src
git clone https://github.com/TixiaoShan/LVI-SAM.git
cd ..
catkin_make

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Datasets

The datasets used in the paper can be downloaded from Google Drive. The data-gathering sensor suite includes: Velodyne VLP-16 lidar, FLIR BFS-U3-04S2M-CS camera, MicroStrain 3DM-GX5-25 IMU, and Reach RS+ GPS.

https://drive.google.com/drive/folders/1q2NZnsgNmezFemoxhHnrDnp1JV_bqrgV?usp=sharing

Note that the images in the provided bag files are in compressed format. So a decompression command is added at the last line of launch/module_sam.launch. If your own bag records the raw image data, please comment this line out.

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Run the package

1. Configure parameters:

Configure sensor parameters in the .yaml files in the ```config``` folder.

2. Run the launch file:

roslaunch lvi_sam run.launch

3. Play existing bag files:

rosbag play handheld.bag 

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Paper

Thank you for citing our paper if you use any of this code or datasets.

@inproceedings{lvisam2021shan,
  title={LVI-SAM: Tightly-coupled Lidar-Visual-Inertial Odometry via Smoothing and Mapping},
  author={Shan, Tixiao and Englot, Brendan and Ratti, Carlo and Rus Daniela},
  booktitle={IEEE International Conference on Robotics and Automation (ICRA)},
  pages={to-be-added},
  year={2021},
  organization={IEEE}
}

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Acknowledgement

• The visual-inertial odometry module is adapted from Vins-Mono.
• The lidar-inertial odometry module is adapted from LIO-SAM.