This is the repo for the paper Robust Visual Teach and Repeat for UGVs Using 3D Semantic Maps. It includes a robotic package for a semantic mapping based algorithm for visual teach and repeat

In order to use this package you need to have ORB-SLAM installed with some changes. So first:

1. Clone and install https://github.com/mmahdavian/ORB_SLAM3

I have used ZED2 camera and you can use this file: https://drive.google.com/file/d/1pnH8I0jPJyFRbS0umJ-sP9qohCG2cBOJ/view?usp=sharing

2. You need a YOLOv3 model to detect objects in the environment. We have provided a trained model file you can use. It has been trained on 24 most common objects in the environment. Those objects are: person,bench,backpack,umbrella,handbag,suitcase,bottle,cup,bowl,banana,apple,chair,couch,bed,tv,laptop,mouse,remote,keyboard,microwave,oven,toaster,sink,clock https://drive.google.com/file/d/1S49rcLiUPrg4bG95tJpmsuYaCCiGi_Of/view?usp=sharing Download the file. You will move the file to darknet-ros package later. If you want to use your own Yolo model you need to modify "semantic_mapping/map.py" code. In gotdata function there are three variables named big_objs,medium_objs and small_objs. They specify general size of each class of objects detected by Yolo. For example Sofa is a big objects and banana is a small one. So based on your model and class numbers change the code.
3. You need to use darknet_ros package to publish detected objects by Yolo model to ROS. For this purpose you can use following link. Clone it in your catkin_ws/src: https://github.com/mmahdavian/darknet_ros

Then move the downloaded model file to darknet_ros/darknet_ros/yolo_network_config/weights folder.

4. In your catkin_ws/src open a terminal and: git clone https://github.com/mmahdavian/semantic_visual_teach_repeat.git
5. cd ../
6. catkin_make

1. roslaunch darknet_ros yolo_v3.launch
2. Then run ORB-SLAM using:

rosrun ORB_SLAM3 Mono Vocabulary/ORBvoc.txt "your camera yaml file"

3. roslaunch semantic_visual_teach_repeat create_map.launch Then you need to move the camera which will be your teach path and the (Visual Teach and Repeat)VTR algorithm will generate a semantic map of the environment for you as teach map.

Robot Path:

Generated Semantic Map:

4. In order to repeat the same motion, first you need to change the name of the generated map and path file from: 'projection.csv' to 'C1.csv' and 'obj_map.csv' to 'M1.csv'
5. At repeat time you need to do step 1 to 3 first. Then after some motion, when you have at least two objects in your semantic map:

cd semantic_visual_teach_repeat/Repeat

python3 relocalization.py

Then robot will be relocalized to a new location.

'python3 forward.py' or 'python3 backward.py' can move the turtlebot2 robot toward the teach path and repeat in forward/backward direction.

You can find a video from the our visual teach and repeat algorithm performance here: https://www.youtube.com/watch?v=raRT7S9NSfc&t

This package is released under BSD-3-Clause License.