Hallöchen!

Giancarlo Todone writes:

> It's something like 6 years I'm trying harder and harder to get
> the best results possible with panorama photography; by now I
> achieved significant improvements both in experience and
> equipment: thanks to a robotic pano head, now taking outside
> panorama is easy enough for me.  However i'm rather disappointed
> that despite of all, when doing interiors, *my panoramas are still
> affected by small errors*.

I've also spent a lot of time for calibrating my equipment and
finally gave up.  I came to the conclusion that remaining stitching
must be eliminated in Gimp.

There are two sources of error that I cannot eliminate fully:

1. The distortion of the lens is modelled with a polynomial, which
   always has a deviation from the actual complex distortion field
   of the lens.

2. Fisheyes don't have a No Parallax Point, so you have no parallax
   only on a circle in your image.

Both errors can be minimized by using a circular crop and
calibrating for this circle, but since the rim of one picture is
inside the rim of another (overlapping pictures after all) this can
never be perfect.

And, point (2) gets worse when doing interiors.  It can be a couple
of mm, especially with large overlaps, so noticable mismatches in
straight lines.  Maybe one could try a rectilinear lens, but I'm not
willing to do that.  I just live with the mismatches.

Tschö,
Torsten.

-- 
Torsten Bronger    Jabber ID: [email protected]
                                  or http://bronger-jmp.appspot.com

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