# GwcNet

This is the implementation of the paper **Group-wise Correlation Stereo Network**, CVPR 19, Xiaoyang Guo, Kai Yang, Wukui Yang, Xiaogang Wang, and Hongsheng Li
[\[Arxiv\]](https://arxiv.org/)

# How to use

## Environment
* python 3.6
* Pytorch >= 0.4.1

## Data Preparation
Download [Scene Flow Datasets](https://lmb.informatik.uni-freiburg.de/resources/datasets/SceneFlowDatasets.en.html), [KITTI 2012](http://www.cvlibs.net/datasets/kitti/eval_stereo_flow.php?benchmark=stereo), [KITTI 2015](http://www.cvlibs.net/datasets/kitti/eval_scene_flow.php?benchmark=stereo)

## Training
**Scene Flow Datasets**

run the script `./scripts/sceneflow.sh` to train on Scene Flow datsets. Please update `DATAPATH` in the bash file as your training data path.

**KITTI 2012 / 2015**

run the script `./scripts/kitti12.sh` and `./scripts/kitti15.sh` to finetune on the KITTI 12/15 dataset. Please update `DATAPATH` and `--loadckpt` as your training data path and pretrained SceneFlow checkpoint file.

## Evaluation
run the script `./scripts/kitti12_save.sh` and `./scripts/kitti15_save.sh` to save png predictions on the test set of the KITTI datasets to the folder `./predictions`.

## Pretrained Models
[Scene Flow](https://drive.google.com/file/d/1qiOTocPfLaK9effrLmBadqNtBKT4QX4S/view?usp=sharing)
[KITTI 2012/2015](https://drive.google.com/file/d/1fOw2W7CSEzvSKzBAEIIeftxw6CuvH9Hl/view?usp=sharing)

# Citation
If you find this code useful in your research, please cite:

```
@inproceedings{guo2019group,
  title={Group-wise Correlation Stereo Network},
  author={Guo, Xiaoyang and Yang, Kai and Yang, Wukui and Wang, Xiaogang and Li, Hongsheng},
  booktitle={Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition},
  pages={3273--3282},
  year={2019}
}
```

# Acknowledgements

Thanks to Jia-Ren Chang for opening source of his excellent work PSMNet. Our work is inspired by this work and part of codes in `models` are migrated from [PSMNet](https://github.com/JiaRenChang/PSMNet).