@inproceedings{wang2014micro,
  title={Micro-expression recognition using robust principal component analysis and local spatiotemporal directional features},
  author={Wang, Su-Jing and Yan, Wen-Jing and Zhao, Guoying and Fu, Xiaolan and Zhou, Chun-Guang},
  booktitle={European Conference on computer vision},
  pages={325--338},
  year={2014},
  organization={Springer}
}