[CVPR 2023] H2ONet: Hand-Occlusion-and-Orientation-aware Network for Real-time 3D Hand Mesh Reconstruction

Hao Xu^1,2, Tianyu Wang¹, Xiao Tang¹, Chi-Wing Fu^1,2,3

¹Department of Computer Science and Engineering

²Institute of Medical Intelligence and XR, ³Shun Hing Institute of Advanced Engineering

The Chinese University of Hong Kong

This is the official implementation of our CVPR2023 paper H2ONet.

Our presentation video: [Youtube].

Our Poster

Todo List

• Single-frame model code
• Occlusion label preparation code for the DexYCB dataset
• Occlusion label preparation code for the HO3D dataset
• Multi-frame model code
• Training config details
• model checkpoints and evaluation code

Install

• Environment

  conda create -n h2onet python=3.8
  conda activate h2onet
  

• Requirements

  pip install -r requirements.txt
  

• Download the pre-trained weights of the backbone densestack.pth from Google drive or Baidu cloud, which are both provided by MobRecon. After than, put it into the checkpoints folder.

Data Preparation

We evaluate different models on the DexYCB and HO3D datasets. The pre-processed ground truths are from HandOccNet. Please follow its instruction to prepare the data and ground truths like this,

|-- data  
|   |-- HO3D
|   |   |-- train
|   |   |   |-- ABF10
|   |   |   |-- ......
|   |   |-- evaluation
|   |   |-- annotations
|   |   |   |-- HO3D_train_data.json
|   |   |   |-- HO3D_evaluation_data.json
|   |-- DEX_YCB
|   |   |-- 20200709-subject-01
|   |   |-- ......
|   |   |-- annotations
|   |   |   |--DEX_YCB_s0_train_data.json
|   |   |   |--DEX_YCB_s0_test_data.json

Occlusion Label Preparation

Our single-frame model does not need the occlusion prediction. To train the fingle-level occlusion classifier in our multi-frame model, we first prepare the occlusion label from the provided ground truths. Please find more details in occ_label_preparation.

Training

We adopt a two-stage training strategy: (i) hand shape reconstruction at canonical pose; and (ii) hand orientation regression based on the model trained in (i).

For training our single-frame model on the DexYCB dataset,

# stage 1
python3 train.py --model_dir=./experiment/single_frame_dexycb/stage_1
# stage 2
python3 train.py --model_dir=./experiment/single_frame_dexycb/stage_2 --resume=./experiment/single_frame_dexycb/stage_1/test_model_best.pth -ow

For training our multi-frame model on the DexYCB dataset, we first load the pre-trained single-frame model (stage 1).

# stage 1
python3 train.py --model_dir=./experiment/multi_frame_dexycb/stage_1 --resume=./experiment/single_frame_dexycb/stage_1/test_model_best.pth -ow
# stage 2
python3 train.py --model_dir=./experiment/multi_frame_dexycb/stage_2 --resume=./experiment/multi_frame_dexycb/stage_1/test_model_best.pth -ow

For training our single-frame and multi-frame models on the HO3D-v2 dataset, we follow the same approach and change the dataset name in the scripts. Note that due to the limited scale of the HO3D-v2 dataset, for training our model in stage 2, we first pre-train it on the DexYCB dataset for a few epochs (<5) to avoid unstable training (e.g., NaN in training).

Testing

To test our pre-trained model,

python test.py --model_dir=./experiment/multi_frame_dexycb/stage_2 --resume=./experiment/multi_frame_dexycb/stage_2/test_model_best.pth

We provide the pre-trained multi-frame model on the DexYCB dataset. [checkpoint]

Citation

@InProceedings{Xu_2023_CVPR,
    author    = {Xu, Hao and Wang, Tianyu and Tang, Xiao and Fu, Chi-Wing},
    title     = {H2ONet: Hand-Occlusion-and-Orientation-Aware Network for Real-Time 3D Hand Mesh Reconstruction},
    booktitle = {Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR)},
    month     = {June},
    year      = {2023},
    pages     = {17048-17058}
}

Acknowledgments

In this project we use (parts of) the official implementations of the following works:

• MobRecon (Lightweight pipeline)
• HandOccNet (HO3D and DexYCB datasets processing)

We thank the respective authors for open sourcing their methods.