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Add comment about initial guess in undistortion
For the equidistant fisheye model, r/f = tan(theta), the Gauss-Newton search to model radial distortion is expected to converge faster by mapping the angular coordinate space into the respective tangent space of the perspective plane. This is consistent to the nPlaneToSpace initial projection used in the calibrate() function of the omnidirectional model (Cal3Unified).
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