@inproceedings{ijcai1981p143,
  title     = {Obtaining Surface Orientation from Texels under Perspective Projection},
  author    = {Ohta, Tu-ichi and Maenobu, Kiyoshi and Sakai, Toshiyuki},
  booktitle = {Proceedings of the Seventh International Joint Conference on
               Artificial Intelligence, {IJCAI-81}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {Roger C. Schank},
  pages     = {746--750},
  year      = {1981},
  month     = {8},
  note      = {Vision: Low-level},
  url       = {https://ijcai.org/proceedings/1981/143},
}