Re: panotools lens distortion coefficients from other programs
- Am 10.10.2011 15:59, schrieb Fanotec:
> Many photogrammetric programs use Brown's distortion model for lensPanotools and related programs use exponents 1,2,3 and 4 while Brown
> distortion correction.
> they have good facility to calculate the coefficients accurately and
> I wonder if any one can relate the coefficients used in panotools to Brown's
uses 0, 2, 4 and 6. You would need to fit a panotools-style correction
curve to a Brown one. No idea whether this is easily possible. Panotools
doesn't support tangential distortion, which the Brown model does.
As a test one could use excel to create points with the Brown model and
then fit a respective polynomial to get the panotools values.
However, Agisoft use a LCD screen as calibration target, which implies
that they don't focus at infinity. Since lens distortion might change
with focus distance this gives potentially bad results for infinity.
Hence I think it's not worth the effort: Shoot a panorama from the exact
no-parallax-point (or with only distant subjects) with good overlap and
get your true correction parameters from panotools (PTGui, hugin...)