@misc{1146196,
  author = {Hongche Liu and Tsai-Hong Hong and Martin Herman and Rama Chellappa},
  title = {Image gradient evolution - a visual cue for danger:},
  year = {1995},
  month = {1995-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NIST.IR.5728},
  language = {en},
}