[Robotics] Camera calibration parameters

[koen buys]

I was also thinking of using the calibration board method as a test.

On 11 May 2010 16:02, Gilberto Echeverria <gilberto.echeverria at laas.fr>wrote:

> Thanks for the suggestions. It would indeed be strange to calibrate the
> camera in the simulation. We expected to avoid this step inside Blender,
> since the data required should be already defined and exist somewhere in
> Blender. The focal length seems to be a modifiable property of the
> camera object in Blender, but the image size is still evading us.
> For the moment we'll try to estimate this measurement from the pattern
> image.
>
> Thanks.
> Gilberto
>
>
> On 05/11/2010 03:28 PM, Paul Fitzpatrick wrote:
> > Another (somewhat strange, but fun) method would be to run a standard
> > calibration program (e.g. from OpenCV).  You'd need to make a plane with
> > a pattern like this on it:
> >     http://www.vision.caltech.edu/bouguetj/calib_doc/htmls/pattern.pdf
> > Then light it, animate it moving around, record several views from the
> > camera, and run the calibration program.
> >
> > Cheers,
> > Paul
> >
> > On 05/11/2010 06:41 AM, koen buys wrote:
> >
> >> Hi Gilberto,
> >>
> >> I once figured this out in a previous version of blender. Together
> >> with Herve Legrand. I will forward you our experiments back then.
> >> You need both the intrinsic and the external calibration matrix. The
> >> external should be fairly easy to find. The internal one was more
> >> difficult.
> >> I hope they didn't change the API of that part.
> >>
> >> Best regards,
> >>
> >> Koen Buys
> >>
> >>
> >> On 11 May 2010 11:14, Gilberto Echeverria<gilberto.echeverria at laas.fr
> >> <mailto:gilberto.echeverria at laas.fr>>  wrote:
> >>
> >>      Hello everyone,
> >>
> >>      As part of the Open Robots Simulator (now called MORSE), we are now
> >>      connecting Blender with other robotics software modules that do the
> >>      processing of the data sent by the simulation. In the case of
> >>      image data
> >>      from a camera, these modules expect the image to have an associated
> >>      calibration matrix.
> >>
> >>      The calibration matrix is composed with the focal point, the focal
> >>      length and the dimensions of the acquired image as a number of
> pixels
> >>      per unit of distance. For the simulated camera in Blender, we can
> >>      consider the focal point to be (0,0). For the other two parameters
> we
> >>      have been unable to find the data in Blender. We are using the
> Blender
> >>      camera object and the VideoTexture module to generate captured
> images.
> >>      Does anyone know where this information could be found in Blender?
> >>
> >>      Best regards
> >>
> >>      Gilberto
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> >>
> >>
> >>
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