PanoTools mailing list archive

Mailinglist:proj-imim
Sender:Helmut Dersch
Date/Time:Sat, 05 Aug 2000 10:44:47 +0100
Subject:Re: Optical center of an image?

Thread:


C Evans wrote:
> 
> I may have missed this on the PanoTools site but...
> 
> Does anyone know how you determine where the optical center of an image is?
> 

Charles

You can use the optimizer tool of the plug-in or PTPicker
(not PTOptimizer) to adjust the d and e parameters. There 
is an example in the PanoTools tutorial:
<http://www.fh-furtwangen.de/~dersch/example.zip>.

If you somehow get the whole image circle on film as in
8mm fisheye lenses, then the center of this circle is
probably a good guess.

Any other method I know requires access to an optical bench.
All this assumes that your lens has a well defined
center which need not be the case. For example, if
you are using the Coolpix fisheye adapter and if this
is decentered with respect to the standard
lens, then you have an almost incorrectable combination.

Regards

Helmut Dersch



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