Am 15.10.2012 15:15, schrieb lireful:
I have calibrated a fisheye lens using Kannala model, which is
basically a polynomial R(theta), where R is the polar coordinates
radius of current point. Now I have a need to work with this
calibration in PTGui. We use Canon APS-C matrix crop-factor 1.62,
4272x2848 matrix in the landscape mode, 8 mm Sigma fisheyes.
You should have asked on the PTGui mailing list first of all...
Sorry, I don't understand the math you provided, only one point: r = 1
in panotools is not half the width, it's half the shorter side. And
perhaps its worth mentioning that the original panotools model (which is
used by PTGui) uses the abc parameters to handle the deviation from the
R=f*theta*m model, not the fisheye distortion itself.
However, I don't understand what you want to accomplish. If you simply
want to calibrate your lens for taking panoramas, do exactly this: take
a panorama (no zenith or nadir for that task), least-parallax-point set
up the best that is possible, no near detail, with a lot of overlap and
enough structure throughout the whole image, put it in hugin or PTGui,
create control points and optimize. That's all that is needed.
Maybe I misunderstand the whole model?
I guess you read http://wiki.panotools.org/Lens_correction_model
To see the model in action while you play with the parameters you can
download abc.xls from http://4pi.org/downloads/
best regards
--
Erik Krause
http://www.erik-krause.de
--
You received this message because you are subscribed to the Google Groups "Hugin and
other free panoramic software" group.
A list of frequently asked questions is available at:
http://wiki.panotools.org/Hugin_FAQ
To post to this group, send email to [email protected]
To unsubscribe from this group, send email to
[email protected]
For more options, visit this group at http://groups.google.com/group/hugin-ptx
