@inproceedings{aneffectivebackgroundestimationmethodfor,
  title = {An Effective Background Estimation Method for Shadows Removal of Document Images},
  author = {Bingshu Wang and C. L. Philip Chen},
  year = {2019},
  booktitle = {ICIP 2019 8},
  url = {https://ieeexplore.ieee.org/document/8803486},
}