DXSLAM

DXSLAM is a visual SLAM system based on deep CNN feature extraction. Please

clone this repo if you want to run an offline evaluation with e.g. the TUM dataset, or
clone dxslam_ros and deep_features if you want a ROS version to work with a live camera or ROS bags e.g. from the OpenLORIS-Scene datasets, or
clone deep_features if you are interested in deep feature extraction only.

Technical details are described in this paper (to be published in IROS 2020):

Dongjiang Li, Xuesong Shi, Qiwei Long, Shenghui Liu, Wei Yang, Fangshi Wang, Qi Wei, Fei Qiao, "DXSLAM: A Robust and Efficient Visual SLAM System with Deep Features," arXiv preprint arXiv:2008.05416, 2020.

@article{li2020dxslam,
  title={{DXSLAM}: A Robust and Efficient Visual {SLAM} System with Deep Features},
  author={Dongjiang Li and Xuesong Shi and Qiwei Long and Shenghui Liu and Wei Yang and Fangshi Wang and Qi Wei and Fei Qiao},
  journal={arXiv preprint arXiv:2008.05416},
  year={2020}
}

The SLAM pipeline in this repo is customized from ORB-SLAM2.

1. Prerequisites

We have tested the library in Ubuntu 16.04 and 18.04, but it should be easy to compile in other platforms.

C++11 or C++0x Compiler
Pangolin
OpenCV
Eigen3
Dbow、Fbow and g2o (Included in Thirdparty folder)
tensorflow(1.12)

2. Building DXSLAM library and examples

Clone the repository:

git clone https://github.com/raulmur/DXSLAM.git DXSLAM

We provide a script build.sh to build the Thirdparty libraries and DXSLAM. Please make sure you have installed all required dependencies (see section 1). Execute:

cd dxslam
chmod +x build.sh
./build.sh

This will create libDXSLAM.so at lib folder and the executables rgbd_tum in Examples folder.

3. RGB-D Example

TUM Dataset

Download a sequence from http://vision.in.tum.de/data/datasets/rgbd-dataset/download and uncompress it.
Associate RGB images and depth images using the python script associate.py

python associate.py PATH_TO_SEQUENCE/rgb.txt PATH_TO_SEQUENCE/depth.txt > associations.txt

Get HF-net output

cd hf-net
python3 getFeature.py image/path/to/rgb output/feature/path

Execute the following command. Change IVIP.yaml to TUM1.yaml,TUM2.yaml or TUM3.yaml for freiburg1, freiburg2 and freiburg3 sequences respectively. Change PATH_TO_SEQUENCE_FOLDERto the uncompressed sequence folder. Change ASSOCIATIONS_FILE to the path to the corresponding associations file.

./Examples/RGB-D/rgbd_tum Vocabulary/DXSLAM.fbow Examples/RGB-D/TUMX.yaml PATH_TO_SEQUENCE_FOLDER ASSOCIATIONS_FILE OUTPUT/FEATURE/PATH

4. Processing your own sequences

You will need to create a settings file with the calibration of your camera. See the settings file provided for the TUM RGB-D cameras. We use the calibration model of OpenCV. RGB-D input must be synchronized and depth registered.

5. SLAM and Localization Modes

You can change between the SLAM and Localization mode using the GUI of the map viewer.

SLAM Mode

This is the default mode. The system runs in parallal three threads: Tracking, Local Mapping and Loop Closing. The system localizes the camera, builds new map and tries to close loops.

Localization Mode

This mode can be used when you have a good map of your working area. In this mode the Local Mapping and Loop Closing are deactivated. The system localizes the camera in the map (which is no longer updated), using relocalization if needed.

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