1. A method for determining lens distortion parameters for an imaging system comprising a lens and an imaging device, the method comprising: capturing an image of a target with a known structure through the lens, the target comprising a known, two-dimensional, planar structure comprising a plurality of control points; detecting the positions of the plurality of control points in the captured image, performing a Euclidean transform on detected control points, calculating an estimate for the positions of the control points without distortion through a projective transformation of their known structure in conjunction with a distortion model applied to these estimated control points to provide an estimated location for distorted control points, comparing these estimated locations to the Euclidean transformed detected control points while simultaneously refining estimated positions through the projective transformation, the distortion model and the Euclidean transform of the measured control point coordinated, to minimize the difference, and storing the distortion model once the difference has been minimized.