Catadioptric Projective Geometry

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omnidirectional vision
catadioptric systems
conic sections
duality
stereographic projection
calibration
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Geyer, Christopher
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Catadioptric sensors are devices which utilize mirrors and lenses to form a projection onto the image plane of a camera. Central catadioptric sensors are the class of these devices having a single effective viewpoint. In this paper, we propose a unifying model for the projective geometry induced by these devices and we study its properties as well as its practical implications. We show that a central catadioptric projection is equivalent to a two-step mapping via the sphere. The second step is equivalent to a stereographic projection in the case of parabolic mirrors. Conventional lens-based perspective cameras are also central catadioptric devices with a virtual planar mirror and are, thus, covered by the unifying model. We prove that for each catadioptric projection there exists a dual catadioptric projection based on the duality between points and line images (conics). It turns out that planar and parabolic mirrors build a dual catadioptric projection pair. As a practical example we describe a procedure to estimate focal length and image center from a single view of lines in arbitrary position for a parabolic catadioptric system.

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2001-12-01
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Postprint version. Published in International Journal of Computer Vision, Volume 45, Number 3, December 2001, pages 223-243. The original publication is available at www.springerlink.com. Publisher URL: http://dx.doi.org/10.1023/A:1013610201135
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