@misc{803261,
  author = {H Liu and Tsai Hong and Martin Herman},
  title = {Image Gradient Evolution - A Visual Cue for Danger},
  year = {1995},
  month = {1995-10-01 00:10:00},
  publisher = {NIST Interagency/Internal Report (NISTIR), National Institute of Standards and Technology, Gaithersburg, MD},
  url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=820538},
  language = {en},
}