@article{an2015novel,
  title={A novel unsupervised approach to discovering regions of interest in traffic images},
  author={An, Zhenyu and Shi, Zhenwei and Wu, Ying and Zhang, Changshui},
  journal={Pattern Recognition},
  volume={48},
  number={8},
  pages={2581--2591},
  year={2015},
  publisher={Elsevier}
}