Active intrinsic calibration using vanishing points
@Inproceedings{dani96cvpr,
  author =               "K. Daniilidis and J. Ernst",
  title =                "Active intrinsic calibration using vanishing points",
  booktitle =    "Proc. CVPR, San Francisco, CA",
  year =                 1996,
  pages = "708-713"
}