@inproceedings{velastin1992estimation,
  title={Estimation of crowd density using image processing},
  author={Velastin, SA and Marana, AN and Costa, LF and Lotufo, RA},
  booktitle={COLLOQUIUM DIGEST-IEE},
  volume={1},
  number={74},
  pages={11--11},
  year={1992}
}

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