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It's just a port of the fisheye model from this Matlab-Toolbox. The second entry on this site refers to the paper with the generic projection model from Kannala-Brandt. The Toolbox and OpenCV are using the equidistance projection model, because it can model panorama cameras with an viewfield up to 360° (fisheye, omnidirectional cameras). The Matlab-Toolbox from the Authors can be found here.