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 assumptions 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.

Conic Based Camera Re-calibration after Zooming / I. Frosio, C. Turrini, A. Alzati (LECTURE NOTES IN COMPUTER SCIENCE). - In: Image analysis and processing, ICIAP 2013 : 17th international conferece, Naples, Italy, September 9-13, 2013; proceedings / [a cura di] A. Petrosino. - Berlin : Springer, 2013. - ISBN 978-3-642-41180-9. - pp. 361-370 (( Intervento presentato al 17. convegno International Conference on Image Analysis and Processing (ICIAP) tenutosi a Napoli nel 2013 [10.1007/978-3-642-41181-6_37].

Conic Based Camera Re-calibration after Zooming

I. Frosio
Primo
;
C. Turrini
Secondo
;
A. Alzati
Ultimo
2013

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 assumptions 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.
camera calibration; conics; computer vision; surveillance
Settore INF/01 - Informatica
Settore MAT/03 - Geometria
International Association for Pattern Recognition (IAPR)
Computational Intelligence Society
Italian Group of Researchers in Pattern Recognition (GIRPR)
Institute of Electrical and Electronics Engineers (IEEE)
Book Part (author)
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/225131
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