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Calibrating fisheye lenses above 180 degrees

Hi Guys,

I am working on a fisheye lens that has a extreme fov around 220 degrees. An example can be seen here:

image description

I have been looking at lens correction in opencv before, but the models as I know them does not make sense when the fov crosses 180 degrees, as the image can not be represented as a plane anymore.

I have currently made a radial model, where i measure pixel distance from center while following a point in the horizon. This is a tedious task, and I hope a better method is around. Hopefully something with a checkerboard or something.

I am therefore looking to see if OpenCV has any tools in that direction?

Kind regards

Jesper