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Mailinglist:PanoTools
Sender:tflyfish2002
Date/Time:2006-Feb-20 23:45:26
Subject:Re: PTGui 5.7 - how to use the antialiasing filters ?

Thread:


PanoTools: Re: PTGui 5.7 - how to use the antialiasing filters ? tflyfish2002 2006-Feb-20 23:45:26
Thomas,
Are we able to use any of these new filters in Pano2QTVR?

Bazzer

-- In #removed#, Thomas Rauscher <yahoo@...> wrote:
>
> Hello Erik,
> 
> on Monday, February 20, 2006, 17:00:23 you wrote:
> 
> >> The kernel size on my page is the radius of the kernel so the largest
> >> kernel is 8x8 pixels. Its also possible to extend this size to what
> >> ever you like, but I see no real advantage since the the maximum
> >> contribution of a pixel beyond this radius with a gamma of 2.2 is
> >> sinc(4.5 * Pi) ^ 2.2 = 0,00295 for a 8 bit image this makes 0,754
of a
> >> step... so a really wide pattern of white/black pixels would be
needed
> >> to see any difference at all... and I doubt that this gives "better"
> >> results instead of just echos in a normal image.
> 
> EK> So why are the old sinc interpolators so large?
> 
> To better perform in the zoneplate rotating test... ;)
> 
> EK> I even think I can see a difference between sinc256 and
> EK> sinc1024...
> 
> Yes, you may notice a difference because the sinc function is windowed
> by another sinc function so if the window is wider, the weights for
> the nearer pixels are a little bit different.
> 
> EK> BTW.: My favourite printing program - QImage - uses so called
Vector and Pyramid
> EK> filters for upsampling. They are far superior to lanczos for
that task. Wouldn't
> EK> they be an alternative for simple resampling, too?
> 
> I will have a look at them! Maybe some day...
> 
> MfG, 
>      Thomas.
>






 
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