  This paper presents a blind detection and compensation technique for camera
lens geometric distortions. The lens distortion introduces higher-order
correlations in the frequency domain and in turn it can be detected using
higher-order spectral analysis tools without assuming any specific calibration
target. The existing blind lens distortion removal method only considered a
single-coefficient radial distortion model. In this paper, two coefficients are
considered to model approximately the geometric distortion. All the models
considered have analytical closed-form inverse formulae.
