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The Visual Computer

, Volume 32, Issue 5, pp 663–674 | Cite as

Camera re-calibration after zooming based on sets of conics

  • Iuri Frosio
  • Cristina Turrini
  • Alberto AlzatiEmail author
Original Article

Abstract

We describe a method to compute the internal parameters (focal and principal point) of a camera with known position and orientation, based on the observation of two or more conics on a known plane. The conics can even be degenerate (e.g., pairs of lines). The proposed method can be used to re-estimate the internal parameters of a fully calibrated camera after zooming to a new, unknown, focal length. It also allows estimating the internal parameters when a second, fully calibrated camera observes the same conics. The parameters estimated through the proposed method are coherent with the output of more traditional procedures that require a higher number of calibration images. A deep analysis of the geometrical configurations that influence the proposed method is also reported.

Keywords

Camera calibration Conics Degenerate conics Ellipses Zoom lens Line detection 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.NVIDIASanta ClaraUSA
  2. 2.Mathematics DepartmentUniversity of MilanMilanItaly

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