@InProceedings{Wellington99:FindDoors,
  author =    {Carl Wellington and Roger Bock and Bruce Maxwell},
  title =     {Combining Color and Edge Information to Find Door Locations in an Image},
  booktitle = {Proceedings of the SPIE Conference on Intelligent Robots and Computer Vision},
  year =      {1999},
  month =     {September},
  location =  {Boston, USA},
  pages =     {185--193}
}