We describe a method to compute the internal parameters (focal and principal points) 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.

Camera re-calibration after zooming based on sets of conics / I. Frosio, C. Turrini, A. Alzati. - In: THE VISUAL COMPUTER. - ISSN 0178-2789. - 32:5(2016), pp. 663-674. [10.1007/s00371-015-1089-8]

Camera re-calibration after zooming based on sets of conics

I. Frosio
Primo
;
C. Turrini
Secondo
;
A. Alzati
2016

Abstract

We describe a method to compute the internal parameters (focal and principal points) 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.
Camera calibration; Conics; Degenerate conics; Ellipses; Zoom lens; Line detection
Settore MAT/03 - Geometria
2016
6-mag-2015
Article (author)
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/276159
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