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LPDC-Net

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This repository contains the code for the project LPDC-Net - Learning Parallel Dense Correspondence from Spatio-Temporal Descriptors for Efficient and Robust 4D Reconstruction

You can find detailed usage instructions for training your own models and using the pretrained models.

Installation

First you have to make sure that you have all dependencies in place. You can create and activate an anaconda environment called lpdc using

conda env create -f environment.yaml
conda activate lpdc

Next, compile the extension modules. You can do this via

python setup.py build_ext --inplace

Demo

You can test our code on the provided input point cloud sequences in the demo/ folder. To this end, simple run

python generate.py configs/demo.yaml

This script should create a folder out/demo/ where the output is stored.

Dataset

Point-based Data

To train a new model from scratch, you have to download the full dataset. You can download the pre-processed data (~42 GB) using

bash scripts/download_data.sh

The script will download the point-based point-based data for the Dynamic FAUST (D-FAUST) dataset to the data/ folder.

Mesh Data

Please follow the instructions on D-FAUST homepage to download the "female and male registrations" as well as "scripts to load / parse the data". Next, follow their instructions in the scripts/README.txt file to extract the obj-files of the sequences. Once completed, you should have a folder with the following structure:

your_dfaust_folder/
| 50002_chicken_wings/
    | 00000.obj
    | 00001.obj
    | ...
    | 000215.obj
| 50002_hips/
    | 00000.obj
    | ...
| ...
| 50027_shake_shoulders/
    | 00000.obj
    | ...

You can now run

bash scripts/migrate_dfaust.sh path/to/your_dfaust_folder

to copy the mesh data to the dataset folder. The argument has to be the folder to which you have extracted the mesh data (the your_dfaust_folder from the directory tree above).

Incomplete Point Cloud Sequence

You can now run

bash scripts/build_dataset_incomplete.sh

to create incomplete point cloud sequences for the experiment of 4D Shape Completion.

Usage

When you have installed all dependencies and obtained the preprocessed data, you are ready to run our pre-trained models and train new models from scratch.

Generation

To start the normal mesh generation process using a trained model, use

python generate.py configs/CONFIG.yaml

where you replace CONFIG.yaml with the name of the configuration file you want to use.

The easiest way is to use a pretrained model. You can do this by using one of the config files

configs/noflow/lpdc_even_pretrained.yaml
configs/noflow/lpdc_uneven_pretrained.yaml
configs/noflow/lpdc_completion_pretrained.yaml

Our script will automatically download the model checkpoints and run the generation. You can find the outputs in the out/pointcloud folder.

Please note that the config files *_pretrained.yaml are only for generation, not for training new models: when these configs are used for training, the model will be trained from scratch, but during inference our code will still use the pretrained model.

Evaluation

You can evaluate the generated output of a model on the test set using

python eval.py configs/CONFIG.yaml

The evaluation results will be saved to pickle and csv files.

Training

Finally, to train a new network from scratch, run

python train.py configs/CONFIG.yaml

You can monitor the training process on http://localhost:6006 using tensorboard:

cd OUTPUT_DIR
tensorboard --logdir ./logs --port 6006

where you replace OUTPUT_DIR with the respective output directory. For available training options, please have a look at config/default.yaml.

Acknowledgements

Most of the code is borrowed from Occupancy Flow. We thank Michael Niemeyer for his great works and repos.

Citation

If you find our code or paper useful, please consider citing

@inproceedings{tang2021learning,
  title={Learning Parallel Dense Correspondence from Spatio-Temporal Descriptors for Efficient and Robust 4D Reconstruction},
  author={Tang, Jiapeng and Xu, Dan and Jia, Kui and Zhang, Lei},
  booktitle={Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition},
  pages={6022--6031},
  year={2021}
}