Awesome

BEHAVE dataset (CVPR'22)

[ArXiv] [Project Page]

Contents

1. Dependencies
2. Dataset Structure
3. Example usage
   • Generate contact labels
   • Visualize GT data
   • Parse object pose parameters
   • Parse SMPL pose parameters
   • Generate images from raw videos
   • Generate point clouds from RGBD images
4. License
5. Citation

Code for BEHAVE model can be accesed here: https://github.com/bharat-b7/BEHAVE

Dependencies

The code is tested on python 3.7, Debian 10.

To start with, create a conda environment: conda create -n behave python=3.7, and then conda activate behave

Most dependencies can be installed with: pip install -r requirements.txt

Some external libraries need to be installed manually:

1. psbody mesh library. See installation. Alternatively, one can use trimesh library by set USE_PSBODY=False in data/const.py.
2. igl. conda install -c conda-forge igl This is used to compute contacts.
3. pytorch3d: conda install -c fvcore -c iopath -c conda-forge fvcore iopath, and then conda install -c pytorch3d pytorch3d.

Dataset Structure

After unzip the dataset, you can find three subfolders: calibs, objects, sequences. The summary of each folder is described below:

calibs: Kinect camera intrinsics and extrinsics for different locations
objects: 3D scans of the 20 objects
sequences: color, depth paired with SMPL and object fits of human-object interaction sequences
split.json: train and test split

We discuss details of each folder next:

calibs: This folder stores the calibrations of Kinects.

DATASET_PATH
|--calibs           # Kinect camera intrinsics and extrinsics for different locations
|----Date[xx]       # background and camera poses for the scene on this date
|------background   # background image and point cloud 
|------config       # camera poses
|---intrinsics      # intrinsics of 4 kinect camera

objects: This folder provides the scans of our template objects.

DATASET_PATH
|--objects
|----object_name
|------object_name.jpg  # one photo of the object
|------object_name.obj  # reconstructed 3D scan of the object
|------object_name.obj.mtl  # mesh material property
|------object_name_tex.jpg  # mesh texture
|------object_name_fxxx.ply  # simplified object mesh 

sequences: This folder provides multi-view RGB-D images and SMPL, object registrations.

DATASET_PATH
|--sequences
|----sequence_name
|------info.json  # a file storing the calibration information for the sequence
|------t*.000     # one frame folder
|--------k[0-3].color.jpg           # color images of the frame
|--------k[0-3].depth.png           # depth images 
|--------k[0-3].person_mask.jpg     # human masks
|--------k[0-3].obj_rend_mask.jpg   # object masks
|--------k[0-3].color.json          # openpose detections
|--------k[0-3].mocap.[json|ply]    # FrankMocap estimated pose and mesh
|--------person
|----------person.ply               # segmented person point cloud
|----------fit02                    # registered SMPL mesh and parameters
|--------object_name
|----------object_name.ply          # segmented object point cloud
|----------fit01                    # object registrations

Note: we store the SMPL-H parameters and corresponding mesh inside each fit02 folder. If you would like to use other body models e.g. SMPL or SMPL-X, please refer to this repo for conversions between different body models.

split.json: this file provides the official train and test split for the dataset. The split is based on sequence name. In total there are 231 sequences for training and 90 sequences for testing.

Example usage

Here we describe some example usages of our dataset:

Generate contact labels

We provide sample code in compute_contacts.py to generate contact labels from SMPL and object registrations. Run with:

python compute_contacts.py -s BEHAVE_PATH/sequences/TARGET_SEQ 

It samples 10k points on the object surface and compute binary contact label, and the correspondence SMPL vertices for each point. The result is saved as an npz file in the same folder of object registration results.

Visualize GT data

We provide example code in behave_demo.py that shows how to access different annotations provided in our dataset. It also renders the SMPL and object registration of a given sequence. Once you have the dataset and dependencies ready, run:

python behave_demo.py -s BEHAVE_PATH/sequences/Date04_Sub05_boxlong -v YOUR_VISUALIZE_PATH -vc 

you should be able to see this video inside YOUR_VISUALIZE_PATH:

Parse object pose parameters

The object registration parameters are saved as axis angle and translation in file [obj_name]_fit.pkl. These parameters transform the centered canonical templates to the Kinect camera coordinate. We provide a simple script in tools/parse_obj_pose.py to show how to use these parameters:

python tools/parse_obj_pose.py -s [the path to a BEHAVE sequence]

after runing this, you can see the transformed meshes stored under the folder tmp/[sequence name].

Parse SMPL pose parameters

We use the SMPL-H body model, please download the latest model(v1.2) from the website. To convert saved SMPL parameters to mesh, check the example script.

Generate images from raw videos

python tools/video2images.py [path to one video] [output path] 

The provided depth images are already pixel aligned with color images, i.e. depth images have the same resolution as color images.

We also release the registrations for all the frames, which you can find download links in our website. Note that NOT all frames have registrations aligned with RGBD images. Some frames are too difficult to obtain accurate registrations hence we discard them or split one sequence into two. You can find the correspondence from each parameter to RGBD images by the frame_times information stored in each npz file (30fps annotations files).

Generate point clouds from RGBD images

python tools/rgbd2pclouds.py BEHAVE_SEQ_ROOT/Date05_Sub05_chairwood -t obj

By default, the generated point clouds will be saved to the same directory of the provided sequence path.

License

Please read the LICENSE file carefully.

Citation

If you use our code or data, please cite:

@inproceedings{bhatnagar22behave,
  title={Behave: Dataset and method for tracking human object interactions},
  author={Bhatnagar, Bharat Lal and Xie, Xianghui and Petrov, Ilya A and Sminchisescu, Cristian and Theobalt, Christian and Pons-Moll, Gerard},
  booktitle={Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition},
  pages={15935--15946},
  year={2022}
}