# EasyMocap
**EasyMocap** is an open-source toolbox for **markerless human motion capture** from RGB videos. In this project, we provide a lot of motion capture demos in different settings.
---
## Core features
### Multiple views of a single person
[](./doc/quickstart.md)
This is the basic code for fitting SMPL[1]/SMPL+H[2]/SMPL-X[3] model to capture body+hand+face poses from multiple views.
Videos are from ZJU-MoCap, with 23 calibrated and synchronized cameras.
### Internet video with a mirror
[](https://arxiv.org/pdf/2104.00340.pdf) [](https://github.com/zju3dv/Mirrored-Human)
Captured with 6 cameras and a mirror
### Multiple Internet videos with a specific action (Coming soon)
[](https://arxiv.org/pdf/2008.07931.pdf) [](./doc/todo.md)
Internet videos of Roger Federer's serving
### Multiple views of multiple people (Coming soon)
[](https://arxiv.org/pdf/1901.04111.pdf) [](./doc/todo.md)
Captured with 4 consumer cameras
### Others
This project is used by many other projects:
- [[CVPR21] Dense Reconstruction and View Synthesis from **Sparse Views**](https://zju3dv.github.io/neuralbody/)
## Other features
- [Camera calibration](apps/calibration/Readme.md): a simple calibration tool based on OpenCV
- [Pose guided synchronization](./doc/todo.md) (comming soon)
- [Annotator](apps/calibration/Readme.md): a simple GUI annotator based on OpenCV
- [Exporting of multiple data formats(bvh, asf/amc, ...)](./doc/02_output.md)
- [Real-time visualization](./doc/realtime_visualization.md)
## Updates
- 06/04/2021: The **real-time 3D visualization** part is released!
- 04/12/2021: Mirrored-Human part is released. We also release the calibration tool and the annotator.
## Installation
See [doc/install](./doc/installation.md) for more instructions.
## Evaluation
The weight parameters can be set according to your data.
More quantitative reports will be added in [doc/evaluation.md](doc/evaluation.md)
## Acknowledgements
Here are the great works this project is built upon:
- SMPL models and layer are from MPII [SMPL-X model](https://github.com/vchoutas/smplx).
- Some functions are borrowed from [SPIN](https://github.com/nkolot/SPIN), [VIBE](https://github.com/mkocabas/VIBE), [SMPLify-X](https://github.com/vchoutas/smplify-x)
- The method for fitting 3D skeleton and SMPL model is similar to [TotalCapture](http://www.cs.cmu.edu/~hanbyulj/totalcapture/), without using point clouds.
- We integrate some easy-to-use functions for previous great work:
- `easymocap/estimator/SPIN` : an SMPL estimator[5]
- `easymocap/estimator/YOLOv4`: an object detector[6](Coming soon)
- `easymocap/estimator/HRNet` : a 2D human pose estimator[7](Coming soon)
We also would like to thank Wenduo Feng who is the performer in the sample data.
## Contact
Please open an issue if you have any questions. We appreciate all contributions to improve our project.
## Citation
This project is a part of our work [iMocap](https://zju3dv.github.io/iMoCap/), [Mirrored-Human](https://zju3dv.github.io/Mirrored-Human/) and [Neural Body](https://zju3dv.github.io/neuralbody/)
Please consider citing these works if you find this repo is useful for your projects.
```bibtex
@inproceedings{dong2020motion,
title={Motion capture from internet videos},
author={Dong, Junting and Shuai, Qing and Zhang, Yuanqing and Liu, Xian and Zhou, Xiaowei and Bao, Hujun},
booktitle={European Conference on Computer Vision},
pages={210--227},
year={2020},
organization={Springer}
}
@inproceedings{peng2021neural,
title={Neural Body: Implicit Neural Representations with Structured Latent Codes for Novel View Synthesis of Dynamic Humans},
author={Peng, Sida and Zhang, Yuanqing and Xu, Yinghao and Wang, Qianqian and Shuai, Qing and Bao, Hujun and Zhou, Xiaowei},
booktitle={CVPR},
year={2021}
}
@inproceedings{fang2021mirrored,
title={Reconstructing 3D Human Pose by Watching Humans in the Mirror},
author={Fang, Qi and Shuai, Qing and Dong, Junting and Bao, Hujun and Zhou, Xiaowei},
booktitle={CVPR},
year={2021}
}
```
## Reference
```bash
[1] Loper, Matthew, et al. "SMPL: A skinned multi-person linear model." ACM transactions on graphics (TOG) 34.6 (2015): 1-16.
[2] Romero, Javier, Dimitrios Tzionas, and Michael J. Black. "Embodied hands: Modeling and capturing hands and bodies together." ACM Transactions on Graphics (ToG) 36.6 (2017): 1-17.
[3] Pavlakos, Georgios, et al. "Expressive body capture: 3d hands, face, and body from a single image." Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition. 2019.
Bogo, Federica, et al. "Keep it SMPL: Automatic estimation of 3D human pose and shape from a single image." European conference on computer vision. Springer, Cham, 2016.
[4] Cao, Z., Hidalgo, G., Simon, T., Wei, S.E., Sheikh, Y.: Openpose: real-time multi-person 2d pose estimation using part affinity fields. arXiv preprint arXiv:1812.08008 (2018)
[5] Kolotouros, Nikos, et al. "Learning to reconstruct 3D human pose and shape via model-fitting in the loop." Proceedings of the IEEE/CVF International Conference on Computer Vision. 2019
[6] Bochkovskiy, Alexey, Chien-Yao Wang, and Hong-Yuan Mark Liao. "Yolov4: Optimal speed and accuracy of object detection." arXiv preprint arXiv:2004.10934 (2020).
[7] Sun, Ke, et al. "Deep high-resolution representation learning for human pose estimation." Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition. 2019.
```
