[Rtk-users] Geometric calibration

[Simon Rit]

Hi Sepp,
I did do a calibration script on a micro CT platform. The idea was that I
had a bb taken from 4 different view points at 4 different heights with a
known distance. Their projected position was segmented beforehand on the
projections and I tried to match the projections by optimizing the
calibration (which we see in before.pdf and after.pdf). I don't think it's
a good script, e.g., because I tried to find 8 parameters when 7 are
sufficient for my system (see, e.g., this paper
<http://iopscience.iop.org/article/10.1088/0031-9155/45/11/327/meta;jsessionid=8DD0F1160098FBC65BB161A0257FBA75.c3.iopscience.cld.iop.org#>).
But this gives you a starting point to develop your own script which will
hopefully be better. Please share if you do something from it!
Thanks,
Simon

On Sat, Nov 19, 2016 at 8:51 PM, Sepp de Raedt <sdr at nrtxray.com> wrote:

> Hi RTK users,
>
> I'm interested in reconstructing images acquired by a fluoroscopy system
> rotating around a knee phantom. Unfortunately, I've been unsuccessful so
> far. I recognize some of the phantom in the reconstructed image, but it
> contains double contours and the shape is deformed.
>
> I think the issue might be incorrect geometry specification. I have images
> also including a phantom containing markers for which we know the
> coordinates, which should allow us to calibrate the system. On the wiki on
> image quality, I saw that some users had developed scripts to do the
> calibration? Would someone be willing to share it?
>
> Kind regards,
> Sepp
>
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