@inproceedings{cao2018sparse,
  title={Sparse Photometric 3D Face Reconstruction Guided by Morphable Models},
  author={Cao, Xuan and Chen, Zhang and Chen, Anpei and Chen, Xin and Li, Shiying and Yu, Jingyi},
  booktitle={Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition},
  pages={4635--4644},
  year={2018}
}