@article{hierarchicalopacitypropagationforimage,
  title = {Hierarchical Opacity Propagation for Image Matting},
  author = {Yaoyi Li and Qingyao Xu and Hongtao Lu},
  year = {2020},
  eprint = {2004.03249},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2004.03249v1},
}