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Mailinglist:PanoTools NG
Sender:Steinar Midtskogen steinar@...
Date/Time:2015-May-16 18:51:10
Subject:Why do I have to optimise g and t (sheer)?


PanoTools NG: Why do I have to optimise g and t (sheer)? Steinar Midtskogen steinar@... 2015-May-16 18:51:10

I'm using autooptimiser to map pixel positions to azimuth and altitude.
That is, I'm only using a single image plus a dummy 360x180 degree
equirectangular image (which has a direct mapping between az, alt and x,
y).  I do this by tracking stars, plate solving (star identification)
and use the results as control points.

The result is a .pto file like this:

Running autooptimiser like this:

 autooptimiser -n lens.pto -o lens2.pto

gives me a reasonable result, which I've visualised here:

However, if I in the lens.pto file above comment out "v g0" and "v t0",
the result is always very bad:

The lens is a (full frame) fisheye lens.  Do the g t parameters have a
special meaning in this case, and must be included in the optimisation?

Steinar Midtskogen

Posted by: Steinar Midtskogen <#removed#>

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