# GIST Multi-Camera Dataset
Collect and Annotate 3D Multi-Camera Multi-Object Tracking Dataset

# Prepare and print a checkerboard
    1) Go to https://calib.io/
    2) Pattern Generator (1) Target Type: Checkerboard, 
    3) Board Width [mm]: 841, (3) Board Height [mm]: 1189, 
    4) Rows: 6, (5) Columns: 4, Checker Width [mm]: 195
    5) Download PDF
    6) Print it two piceces of the PDF with A0 paper (841x1189 mm)
    7) Glue them together precisely and tightly
    

# Install Packages
    sudo apt install ffmpeg
    pip install numpy==1.23.5 pandas==1.5.1 opencv-python==4.10.0.84
    


# Process
0. Videos are captured from Android devices using [RecSync](https://github.com/MobileRoboticsSkoltech/RecSync-android.git) with some modifications.
    - Adding TrueTime dependency `'com.github.instacart:truetime-android:3.4'` to `app/build.gradle`. In `MainActivity.java` make sure to init TrueTime, `trueTimeInitialized.await();`
    - `CameraController.java`, `long synchronizedTimestampNs = TrueTime.now().getTime();`. This change adapts one captured frame cooresponding to a timestamp obtained from TrueTime.
    - `SoftwareSyncController.java`, `leaderAddress = InetAddress.getByName("172.17.3.136");` change IP address of leader server.
    - If all Android devices are not the same model, we need to move some statements out of `if (isLeader) {})`
        ```
        exposureSeekBar.setVisibility(View.VISIBLE);
        sensitivitySeekBar.setVisibility(View.VISIBLE);
        exposureSeekBar.setOnSeekBarChangeListener(
        ```
      This setting allows us to ajust `sensitivity` and `exposure` of Android camera.
1. Videos are extracted using FFMPEG
2. Frames of each video are matched using timestamp obtained from `TrueTime`
3. `calibration_syncvideos.py` outputs calibration matrix from synchronized and extracted frames. Synchronized frames are saved in a folder name as `./GMC0715/S20`.

# Contact
Linh Ma (linh.mavan@gm.gist.ac.kr), Machine Learning & Vision Laboratory, GIST, South Korea

### Citation
If you find this project useful in your research, please consider citing by:

```
@article{linh2024inffus,
      title={Track Initialization and Re-Identification for {3D} Multi-View Multi-Object Tracking}, 
      author={Linh Van Ma, Tran Thien Dat Nguyen, Ba-Ngu Vo, Hyunsung Jang, Moongu Jeon},
      journal={Information Fusion},
      volume = {111},
      year={2024},
      publisher={Elsevier}
}
```

---
license: mit
---