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Conic Based Camera Re-calibration after Zooming

  • Iuri Frosio
  • Cristina Turrini
  • Alberto Alzati
Part of the Lecture Notes in Computer Science book series (LNCS, volume 8156)

Abstract

We describe here a method to compute the internal parameters of a camera whose position and orientation are known. The method is based on the observation of at least three conics on a known plane; these can be easily extracted in a real scenario from a tiled floor or other regular structures. The method estimates the principal point and focal length using a unique image of the conics when these are observed by an additional calibrated camera. Differently from other methods, no assumption is made on the conics used for calibration. The experimental results demonstrate that the accuracy of the method is comparable to that of more traditional (and time consuming) approaches. It can find applications in systems of Pan-Zoom-Tilt (PZT) or traditional cameras, that are nowadays widely employed, for instance in the surveillance domain, and require frequent re-calibration.

Keywords

camera calibration conics computer vision surveillance 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Iuri Frosio
    • 1
  • Cristina Turrini
    • 2
  • Alberto Alzati
    • 2
  1. 1.Computer Science Dept.University of MilanItaly
  2. 2.Mathematics Dept.University of MilanItaly

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