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PU-Net: Point Cloud Upsampling Network

by Lequan Yu, Xianzhi Li, Chi-Wing Fu, Daniel Cohen-Or, Pheng-Ann Heng.

Introduction

This repository is for our CVPR 2018 paper 'PU-Net: Point Cloud Upsampling Network'. The code is modified from PointNet++ and PointSetGeneration.

Installation

This repository is based on Tensorflow and the TF operators from PointNet++. Therefore, you need to install tensorflow and compile the TF operators.

For installing tensorflow, please follow the official instructions in here. The code is tested under TF1.3 (higher version should also work) and Python 2.7 on Ubuntu 16.04.

For compiling TF operators, please check tf_xxx_compile.sh under each op subfolder in code/tf_ops folder. Note that you need to update nvcc, python and tensoflow include library if necessary. You also need to remove -D_GLIBCXX_USE_CXX11_ABI=0 flag in g++ command in order to compile correctly if necessary.

To compile the operators in TF version >=1.4, you need to modify the compile scripts slightly.

First, find Tensorflow include and library paths.

    TF_INC=$(python -c 'import tensorflow as tf; print(tf.sysconfig.get_include())')
    TF_LIB=$(python -c 'import tensorflow as tf; print(tf.sysconfig.get_lib())')

Then, add flags of -I$TF_INC/external/nsync/public -L$TF_LIB -ltensorflow_framework to the g++ commands. You can refer tf_cd_compile.sh.

Note

When running the code, if you have undefined symbol: _ZTIN10tensorflow8OpKernelE error, you need to compile the TF operators. If you have already added the -I$TF_INC/external/nsync/public -L$TF_LIB -ltensorflow_framework but still have cannot find -ltensorflow_framework error. Please use 'locate tensorflow_framework ' to locate the tensorflow_framework library and make sure this path is in $TF_LIB.

Usage

Clone the repository:

git clone https://github.com/yulequan/PU-Net.git
cd PU-Net

Compile the TF operators Follow the above information to compile the TF operators.
Train the model: First, you need to download the training patches in HDF5 format from GoogleDrive and put it in folder h5_data. Then run:
```
cd code
python main.py --phase train
```
Evaluate the model: First, you need to download the pretrained model from GoogleDrive, extract it and put it in folder 'model'. Then run:
```
cd code
python main.py --phase test --log_dir ../model/generator2_new6
```
You will see the input and output results in the folder ../model/generator2_new6/result.
The training and testing mesh files can be downloaded from GoogleDrive.

Note: In this version, we treat the whole input point cloud as a single input. If the number of points in your input point cloud is big, you had better divide the input point cloud into patches and treat each patch as a single input. (see our following work EC-Net)

Evaluation code

We provide the code to calculate the metric NUC in the evaluation code folder. In order to use it, you need to install the CGAL library. Please refer this link to install this library. Then:

cd evaluation_code
cmake .
make
./evaluation nicolo.off nicolo.xyz

The second argument is the mesh, and the third one is the predicted points.

After running this program, the distances of each predicted point to the surface are written in nicolo_point2mesh_distance.xyz, and the density of each disk (n_i/N) are written in nicolo_density.xyz.

Citation

If PU-Net is useful for your research, please consider citing:

@inproceedings{yu2018pu,
     title={PU-Net: Point Cloud Upsampling Network},
     author={Yu, Lequan and Li, Xianzhi and Fu, Chi-Wing and Cohen-Or, Daniel and Heng, Pheng-Ann},
     booktitle = {Proceedings of IEEE Conference on Computer Vision and Pattern Recognition (CVPR)},
     year = {2018}

}

Questions

Please contact 'lqyu@cse.cuhk.edu.hk'