@article{learnablemultilevelfrequencydecompositio,
  title = {Learnable Multi-level Frequency Decomposition and Hierarchical Attention Mechanism for Generalized Face Presentation Attack Detection},
  author = {Meiling Fang and Naser Damer and Florian Kirchbuchner and Arjan Kuijper},
  year = {2021},
  eprint = {2109.07950},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2109.07950v3},
}