PanoTools NG:
Re: Some more tests on Optimal Cubefaces.
Erik Krause 2008-Nov-01 15:21:09
Am Saturday, November 01, 2008 um 13:17 schrieb Hans Nyberg:
> CubicConverter uses Bicubic which seems to be called Cubic in wiki.
> Why not use the Bicubic definition if it is the same. I never heard
> anyone call it just cubic. Photoshop today has 3 Bicubic versions.
I don't know whether it is really the same. However, apparently the
algorithm was called cubic in the originating paper:
http://ieeexplore.ieee.org/search/wrapper.jsp?arnumber=1163711
> From what I understand Pano2VR uses Mitchell as default but Mitchell softens the
> cubefaces slightly compared to CubiConverter. They need 0,4 100% unsharp mask to get
> back to the same quality if you do an conversion with editing cubefaces and convert back
> to equirectangular. This does not make sense after reading your comment as Mitchell
> should have the same effect as Cubic.
>
> Lazcos 3 gives normally same quality as CubicConverter but I found that I had to get up
> to Blackman/sinc Filter to get the same when doing downsizing.
Interesting. I think Thomas should clarify...
best regards
--
Erik Krause
Offenburger Str. 33
79108 Freiburg
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