Vid2Avatar: 3D Avatar Reconstruction from Videos in the Wild via Self-supervised Scene Decomposition

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Official Repository for CVPR 2023 paper Vid2Avatar: 3D Avatar Reconstruction from Videos in the Wild via Self-supervised Scene Decomposition.

Getting Started

• Clone this repo: git clone https://github.com/MoyGcc/vid2avatar
• Create a python virtual environment and activate. conda create -n v2a python=3.7 and conda activate v2a
• Install dependenices. cd vid2avatar, pip install -r requirement.txt and cd code; python setup.py develop
• Install Kaolin. We use version 0.10.0.
• Download SMPL model (1.0.0 for Python 2.7 (10 shape PCs)) and move them to the corresponding places:

mkdir code/lib/smpl/smpl_model/
mv /path/to/smpl/models/basicModel_f_lbs_10_207_0_v1.0.0.pkl code/lib/smpl/smpl_model/SMPL_FEMALE.pkl
mv /path/to/smpl/models/basicmodel_m_lbs_10_207_0_v1.0.0.pkl code/lib/smpl/smpl_model/SMPL_MALE.pkl

Download preprocessed demo data

You can quickly start trying out Vid2Avatar with a preprocessed demo sequence including the pre-trained checkpoint. This can be downloaded from Google drive which is originally a video clip provided by NeuMan. Put this preprocessed demo data under the folder data/ and put the folder checkpoints under outputs/parkinglot/.

Training

Before training, make sure that the metaninfo in the data config file /code/confs/dataset/video.yaml does match the expected training video. You can also continue the training by changing the flag is_continue in the model config file code/confs/model/model_w_bg. And then run:

cd code
python train.py

The training usually takes 24-48 hours. The validation results can be found at outputs/.

Test

Run the following command to obtain the final outputs. By default, this loads the latest checkpoint.

cd code
python test.py

3D Visualization

We use AITViewer to visualize the human models in 3D. First install AITViewer: pip install aitviewer imgui==1.4.1, and then run the following command to visualize the canonical mesh (--mode static) or deformed mesh sequence (--mode dynamic):

cd visualization 
python vis.py --mode {MODE} --path {PATH}

Play on custom video

• We use ROMP to obtain initial SMPL shape and poses: pip install --upgrade simple-romp
• Install OpenPose as well as the python bindings.
• Put the video frames under the folder preprocessing/raw_data/{SEQUENCE_NAME}/frames
• Modify the preprocessing script preprocessing/run_preprocessing.sh accordingly: the data source, sequence name, and the gender. The data source is by default "custom" which will estimate camera intrinsics. If the camera intrinsics are known, it's better if the true camera parameters can be given.
• Run preprocessing: cd preprocessing and bash run_preprocessing.sh. The processed data will be stored in data/. The intermediate outputs of the preprocessing can be found at preprocessing/raw_data/{SEQUENCE_NAME}/
• Launch training and test in the same way as above. The metainfo in the data config file /code/confs/dataset/video.yaml should be changed according to the custom video.

Acknowledgement

We have used codes from other great research work, including VolSDF, NeRF++, SMPL-X, Anim-NeRF, I M Avatar and SNARF. We sincerely thank the authors for their awesome work! We also thank the authors of ICON and SelfRecon for discussing experiment.

Related Works

Here are more recent related human body reconstruction projects from our team:

• Jiang and Chen et. al. - InstantAvatar: Learning Avatars from Monocular Video in 60 Seconds
• Shen and Guo et. al. - X-Avatar: Expressive Human Avatars
• Yin et. al. - Hi4D: 4D Instance Segmentation of Close Human Interaction

@inproceedings{guo2023vid2avatar,
      title={Vid2Avatar: 3D Avatar Reconstruction from Videos in the Wild via Self-supervised Scene Decomposition},
      author={Guo, Chen and Jiang, Tianjian and Chen, Xu and Song, Jie and Hilliges, Otmar},    
      booktitle = {Computer Vision and Pattern Recognition (CVPR)},
      year      = {2023}
    }