Estimating the radial distortion of an optical system; effect on a localization process

Presents a method for estimating the radial distortion generated by the lenses of an optical system. This method is based on the properties of a projective invariant: the cross ratio of four collinear points. It provides an iterative correction algorithm which computes images of planar grids. The calculated distortion curve is modeled by a cubic B-spline. Experiments with both synthetic and real data prove the validity of the approach. Furthermore, to show the effect of the radial distortion correction, results of different localization processes applied to corrected and uncorrected images are reported and compared