The inversion camera model
 @InProceedings{perwass06dagm,
  author = 	 {C. Perwass and G. Sommer},
  title = 	 {The inversion camera model},
  booktitle =	 {28. Symposium f{\"u}r Mustererkennung, DAGM 2006, Berlin, 12.-14.09.2006},
  year =     {2006},
  series =   {LNCS},
  number =   {4174},
  organization = {Springer-Verlag, Berlin, Heidelberg},
  pages     = {647-656}
}