Self-Calibration of a General Radially Symmetric Distortion Model

Abstract : We present a new approach for self-calibrating the distortion function and the distortion center of cameras with general radially symmetric distortion. In contrast to most current models, we propose a model encompassing fisheye lenses as well as catadioptric cameras with a view angle larger than 180 degrees. Rather than representing distortion as an image displacement, we model it as a varying focal length, which is a function of the distance to the distortion center. This function can be discretized, acting as a general model, or represented with e.g. a polynomial expression. We present two exible approaches for calibrating the distortion function. The first one is a plumbline-type method; images of line patterns are used to formulate linear constraints on the distortion function parameters. This linear system can be solved up to an unknown scale factor (a global focal length), which is suficient for image rectification. The second approach is based on the first one and performs self-calibration from images of a textured planar object of unknown structure. We also show that by restricting the camera motion, self-calibration is possible from images of a completely unknown, non-planar scene. The analysis of rectified images, obtained using the computed distortion functions, shows very good results compared to other approaches and models, even those relying on non-linear optimization.
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Communication dans un congrès
European Conference on Computer Vision, May 2006, Graz, Austria. 4, pp.186-199, 2006
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Jean-Philippe Tardif, Peter Sturm, Sébastien Roy. Self-Calibration of a General Radially Symmetric Distortion Model. European Conference on Computer Vision, May 2006, Graz, Austria. 4, pp.186-199, 2006. 〈inria-00387130〉

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