proj-imim:
Optimizer
Marcus Bointon 2000-May-01 13:58:48
Hi,
I've been trying to correct for a Kenko 0.42x converter on a Coolpix 950.
It's a pretty bendy lens, and coupled with the 950s own distortions, needs
some fair correction.
I followed Peter Murphy's guide at:
http://homepages.tig.com.au/~prism/calib.htm
with essentially no success at all. I painstakingly noted positions of about
25 evenly-distributed match points across three carefully prepared images,
and dropped them into an optimizer script as suggested, but the results I
get are not much good at all. If I apply the a,b,c,d coefficients it finds
to a radial shift, I get an even more bulgy looking image with a distinct
ripple near the centre. I thought perhaps that it was correcting towards a
spherical (rather than rectilinear) image, so I tried to remap from PSphere
back to "normal" and it was still very wonky. To say how bad this is - I get
way better results with a -20% sphereize in photoshop!
I'm clearly doing something wrong here - can someone tell me what?
Thanks,
Marcus
--
Marcus Bointon
Synchromedia Limited: Putting you in the picture
#removed# | http://www.synchromedia.co.uk