PanoTools NG:
Strange interpolator artifacts when warping fisheye images
John Houghton 2007-Mar-06 13:56:08
While I was doing some tests with PTGui to see which interpolators
might produce the best results, I came across strange and worrying
defects in the output equirectangular images when remapping fisheye
images (Sigma 8mm f/3.5 on a 20D) to 180x180 equirectangular. These
defects occurred for both lanczos3 amd mitchell, which I had picked on
as likely candidates to give marginally better results than the much
faster spline36 - my usual choice. While the centre of the stitched
images are fine, there are two narrow strips across the image towards
the the top and bottom that are oddly blurred. Here is a sample (100%
crops):
http://homepage.ntlworld.com/j.houghton/terps.jpg
spline36 and sinc256 worked fine. The results were the same whether
using PTGui's stitcher or Panorama Tools. I'm using pano12.dll V2.8.0
from Jim W. Is this a known problem, perhaps cured in later versions
of software? It just occurs to me that I left the "fast transform"
option checked, so I suppose there's a chance that that might be a
factor.
John
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