NDT-Map-Code

NDT-Map-Code: A 3D global descriptor for real-time loop closure detection in lidar SLAM

You can find the paper here NDT-Map-Code.

News <a name="news"></a>

[2024/2]:fire: NDT-Map-Code is accepted by IROS 2024.

Demo

Example

We implemented the SLAM package of NDTMC and LIOSAM integration, which can be found at NDTMC-LIO-SAM.
We tested our descriptor on KITTI sequences 00, 02, 05, 06, 07 and 08:

F1 score and extended precision results on the KITTI dataset:

How to use

Create GT of LCD

Use script/create_ground_truth.py to generate the LCD GT value, you need to modify the two file paths in the script/create_ground_truth.py (odometry ground truth file path, LCD GT value result path).
Save descriptors

Modify the main function in run_demo.cpp as follow:
```
int main(int argc, char **argv)
{
    saveDesc(argv);
    // matchForKitti(argv);
    // matchForNIO(argv);
    return 0;
}
```
Build and run script/auto_test.py to generate descriptors, where input_folder and output_folder need to be modified to the voledyne folder path of the currently processed sequence and the folder path where you want to save the descriptor results, respectively.
Descriptors matching

Modify the main function in run_demo.cpp as follow:
```
int main(int argc, char **argv)
{
    // saveDesc(argv);
    matchForKitti(argv);
    // matchForNIO(argv);
    return 0;
}
```
Build and run script/auto_match.py to perform descriptor matching, where input_folder and output_txt need to be modified to the folder path where the descriptor was saved in the previous step and the txt file path where you want to save the matching result, respectively.

At this point, you can get the matching result of each frame, and you can process it yourself to get more result information, such as: precision-recall curve, F1 Score and Extended Precision.

Cite NDTMC

@inproceedings{liao2024ndt,
  title={NDT-Map-Code: A 3D global descriptor for real-time loop closure detection in lidar SLAM},
  author={Liao, Lizhou and Yan, Wenlei and Sun, Li and Bai, Xinhui and You, Zhenxing and Yuan, Hongyuan and Fu, Chunyun},
  booktitle={2024 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS)},
  pages={7854--7861},
  year={2024},
  organization={IEEE}
}

Contact

Maintainer: Lizhou Liao (liaolizhou@icloud.com)

Contributors

Lizhou Liao: completed the code

Acknowledgement

Thanks for NIO low-speed localization and mapping group.

NDTMC

Install / Use

README