> - Although not very widely known, a `normal` statement can be applied to
> the camera to distort the image based on a pattern.

I didn't know this trick, it deserves a try.

> - The `user_defined` camera being introduced in v3.8 can also be used to
> implement almost arbitrary camera projections, provided they can be
> expressed as a set of functions mapping screen coordinates to ray origin
> coordinates and direction vector components.

This could be very useful. I hope that this feature will be well documented.

Nevertheless, I still think that an implementation of optical distortion
consistent with the literature definitions and terms (as in the followong
references) would be preferable and more useful (and appealing!) for the
community.

Bouguet model:
http://www.vision.caltech.edu/bouguetj/calib_doc/htmls/parameters.html
Open CV:
https://docs.opencv.org/2.4/doc/tutorials/calib3d/camera_calibration/camera_calibration.html

igmar

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