Camera Resectioning from a Box

  • Authors:
  • Henrik Aanæs;Klas Josephson;François Anton;Jakob Andreas Bærentzen;Fredrik Kahl

  • Affiliations:
  • DTU Informatics, Technical University of Denmark, Lyngby, Denmark 2800 Kgs.;Centre For Mathematical Sciences, Lund University, Lund, Sweden;DTU Informatics, Technical University of Denmark, Lyngby, Denmark 2800 Kgs.;DTU Informatics, Technical University of Denmark, Lyngby, Denmark 2800 Kgs.;Centre For Mathematical Sciences, Lund University, Lund, Sweden

  • Venue:
  • SCIA '09 Proceedings of the 16th Scandinavian Conference on Image Analysis
  • Year:
  • 2009

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Abstract

In this paper we describe how we can do camera resectioning from a box with unknown dimensions, i.e. determine the camera model, assuming that image pixels are square. This assumption is equivalent to assuming that the camera has an aspect ratio of one and zero skew, and this holds for most -- if not all -- digital cameras. Our proposed method works by first deriving 9 linear constraints on the projective camera matrix from the box, leaving a 3-dimensional subspace in which the projective camera matrix can lie. A single solution in this 3D subspace is then found via a method by Triggs in 1999, which uses the square pixel assumption to set up a 4th degree polynomial to which the solution is the desired model. This approach is, however, numerically challenging, and we use several means to tackle this issue. Lastly the solution is refined in an iterative manner, i.e. using bundle adjustment.