Am 24.02.2013 07:35, schrieb cspiel:
>...and I suspect doing it like this
>would avoid the nasty 'whorl' artefacts we get at the zenith/nadir
>(this assumption needs testing).
AFAICT, your whorl comes from Enblend
treating images in an Euclidean coordinate
system.
There is a solution to the "whorl" problem and it is simple: Change
orientation of Zenith and Nadir such that they are in the center of an
image, blend, remap back and blend with the rest of the panorama. This
is the way PTStitcherNG does it. See -n parameter on man page:
http://tinyurl.com/2582cqt
As far as I see there are two ways to implement this in nona/enblend:
One is to integrate multi resolution blending in nona, the other is to
prepare the zenith and nadir cap in nona, send the result images to
enblend, remap back and send it together with the other images
(eventually with cropped away zenith/nadir parts to avoid redundancy and
silly error messages) to enblend again.
Notice that this is necessary only if blending seams are near
zenith/nadir. Since enblend determines the blending seams (at least if
seam optimization is switched on), for a fully automatic solution it
would need another step, where enblend tells nona where the seams are or
whether it is necessary to produce the cap images.
--
Erik Krause
http://www.erik-krause.de
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