labelCloud

A lightweight tool for labeling 3D bounding boxes in point clouds.

🆕 labelCloud is now part of the PyPI and can be installed via pip!

🆕 We are currently evaluating labelCloud and invite you to fill this questionaire https://forms.gle/moEyjGSa1Eiiq7VT8 (~5 min)!

Modifications for relationships

visualization of outputs

Green : True positives

Red : False negatives

Yellow : False positives

relationship annotation steps

double-click : Select first element (green highlight)
ctrl+double-click : Select second element (red highlight)
press relationship button

Setup

ℹ️ Currently labelCloud supports Python 3.6 to 3.9.

via pip (PyPI)

pip install labelCloud
labelCloud --example  # start labelCloud with example point cloud

via git (manually)

git clone https://github.com/ch-sa/labelCloud.git  # 1. Clone repository
pip install -r requirements.txt  # 2. Install requirements
# 3. Copy point clouds into `pointclouds` folder.
python3 labelCloud.py  # 4. Start labelCloud

Configure the software to your needs by editing the config.ini file or settings according to the docs.

Labeling

labelCloud supports two different ways of labeling (picking & spanning) as well as multiple mouse and keyboard options for subsequent correction.

(See also https://www.youtube.com/watch?v=8GF9n1WeR8A for a short introduction and preview of the tool.)

Picking Mode

Pick the location of the bounding box (front-top edge)
Adjust the z-rotation by scrolling with your mouse wheel

Spanning Mode

Subsequently span the length, width and height of the bounding box by selecting four vertices
The layers for for the last two vertices (width & height) will be locked to allow easy selection

Correction

Use the buttons on the left-hand side or shortcuts to correct the translation, dimension and rotation of the bounding box
Resize the bounding box by holding your cursor above one side and scrolling with the mouse wheel

By default the x- and y-rotation of bounding boxes will be prohibited. For labeling 9 DoF-Bounding Boxes deactivate z-Rotation Only Mode in the menu, settings or config.ini file. Now you will be free to rotate around all three axes.

Import & Export Options

labelCloud is built for a versatile use and aims at supporting all common point cloud file formats and label formats for storing 3D bounding boxes. The tool is designed to be easily adaptable to multiple use cases. To change the settings, simply edit the corresponding line in the config.ini (see the documentation) for a description of all parameters).

Supported Import Formats

Type	File Formats
Colored	`.pcd`, `.ply`, `.pts`, `.xyzrgb`
Colorless	`.xyz`, `.xyzn`, `*.bin` (KITTI)

Supported Export Formats

Label Format	Description
`centroid_rel`	Centroid `[x, y, z]`; Dimensions `[length, width, height]`; Relative Rotations as Euler angles in radians (-pi..+pi) `[yaw, pitch, roll]`
`centroid_abs`	Centroid `[x, y, z]`; Dimensions `[length, width, height]`; Absolute Rotations as Euler angles in degrees (0..360°) `[yaw, pitch, roll]`
`vertices`	8 Vertices of the bounding box each with `[x, y, z]` (see documentation.md for order)
`kitti`	Centroid; Dimensions; z-Rotation (See specification)
`kitti_untransformed`	See above, but without transformations.

You can easily create your own exporter by subclassing the abstract BaseLabelFormat. All rotations are counterclockwise (i.e. a z-rotation of 90°/π is from the positive x- to the negative y-axis!).

Shortcuts

Shortcut	Description
Navigation
Left Mouse Button	Rotates the Point Cloud
Right Mouse Button	Translates the Point Cloud
Mouse Wheel	Zooms into the Point Cloud
Correction
`W`, `A`, `S`, `D` `Ctrl` + Right Mouse Button	Translates the Bounding Box back, left, front, right
`Q`, `E`	Lifts the Bounding Box up, down
`X`, `Y`	Rotates the Boundign Box around z-Axis
Scrolling with the Cursor above a Bounding Box Side ("Side Pulling")	Changes the Dimension of the Bounding Box
`C` & `V`, `B` & `N`	Rotates the Bounding Box around y-Axis, x-Axis
General
`Del`	Deletes Current Bounding Box
`R`	Resets Perspective
`Esc`	Cancels Selected Points

See documentation.md for software conventions.

Usage & Attribution

When using the tool feel free to drop me a mail with feedback or a description of your use case (christoph.sager[at]tu-dresden.de). If you are using the tool for a scientific project please consider citing our pending publication:

# CAD Journal
@article{Sager_2022,
    doi = {10.14733/cadaps.2022.1191-1206},
    url = {http://cad-journal.net/files/vol_19/CAD_19(6)_2022_1191-1206.pdf},
    year = 2022,
    month = {mar},
    publisher = {{CAD} Solutions, {LLC}},
    volume = {19},
    number = {6},
    pages = {1191--1206},
    author = {Christoph Sager and Patrick Zschech and Niklas Kuhl},
    title = {{labelCloud}: A Lightweight Labeling Tool for Domain-Agnostic 3D Object Detection in Point Clouds},
    journal = {Computer-Aided Design and Applications}
} 

# CAD Conference
@misc{sager2021labelcloud,
  title={labelCloud: A Lightweight Domain-Independent Labeling Tool for 3D Object Detection in Point Clouds}, 
  author={Christoph Sager and Patrick Zschech and Niklas Kühl},
  year={2021},
  eprint={2103.04970},
  archivePrefix={arXiv},
  primaryClass={cs.CV}
}

Acknowledgment

I would like to thank the Robotron RCV-Team for the support in the preparation and user evaluation of the software. The software was developed as part of my diploma thesis titled "labelCloud: Development of a Labeling Tool for 3D Object Detection in Point Clouds" at the Chair for Business Informatics, especially Intelligent Systems of the TU Dresden. The ongoing research can be followed in our project on ResearchGate.

haritha-j/labelCloud