Yclept Nemo wrote:
Is it possible to create a rectilinear panorama from images (shot from
one location) ranging (tip-to-tip) 67 degrees horizontally and 50
degrees vertically such that the output image plane does not appear to
"lean" forwards or backwards, but flat as in
http://www.flickr.com/photos/acmace/5239601953/sizes/l/ ?
I'm only able to create a semi-decent projection from equirectangular
and even then the top flanges outwards, but perhaps this is since the
image was shot quite close (100ft) to the base of the buildings and
there is substantial amounts of perspective distortion.
You can only retro-correct perspective if the subject is flat (2D);
the facades of many building are (close to) 2D, so this is feasible.
If you alter the perspective (implicitly altering the point where the image
was taken), and there is genuine perspective in the image
(lots of 3D objects ate various distances) it all goes wrong.
I used perspective correction to "square up"
this shot of some gothic carving, and the strongly 3D carving
looks a bit odd.
http://galootcentral.com/components/cpgalbums/userpics/10152/gothic.JPG
BugBear
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