Perceived contrast of filtered natural images

@InProceedings\{TCP1999,
  author       = "Tom Troscianko and M. Chirimuuta and C. Alejandro Parraga and D.J. Tolhurst",
  title        = "Perceived contrast of filtered natural images",
  booktitle    = "Applied Vision Association (AVA'99)",
  month        = "Dec",
  year         = "1999",
  organization = "Aston University",
  address      = "Birmingham (UK)",
  url          = "http://www.cat.uab.cat/Public/Publications/1999/TCP1999"
}