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Jaime Vives Piqueres <jai### [at] ignorancia org> wrote:
> >
> > Oops, what I meant to say was 'barrel distortion' (and 'pincushion
> > distortion' and etc.)
>
> That looks like a new usage-case for the meshcam... if you can make a
> mesh that gives the same barrel distortion as your real camera.
>
That's a VERY intriguing idea, one that never occurred to me: to make my own
UN-distorter. (Then 'reversing' it later, to add the distortion back in.)
Wonderful! First, of course, I need to understand how the meshcam feature works
;-)
Prior to using that idea, I would need to do a useful little experiment: take a
large flat board (a real one), fill it with evenly-spaced horizontal and
vertical lines, and place it in front of my tripod-mounted video camera,
perpendicular to the lens axis. Then shoot a short video (maybe with some
pan/tilt/roll thrown into the mix.) This would give me a 'visual basis' for
determining the amount of distortion in the camera's lens.
The one *possible* problem I foresee with the meshcam idea (if I understand that
feature correctly) is that, during these un-distortions and re-distortions, the
POV-Ray camera might not make perfect 1:1 pixel reproductions of the original
images, causing possible moire effects or pixel jitter. (To explain that better:
I often use the VirtualDub/Deshaker combination to simply smooth out the motion
in my videos-- which necessarily means that the images are slightly 'moved
around' and then re-rendered. To do this accurately, it has a very sophisticated
interpolation mechanism that blends pixels with sub-pixel accuracy, so that the
'smoothed' video shows no moire effects at all. I don't know if that's possible
in POV-Ray, by using only interpolate 2 on the images.)
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