PanoTools mailing list archive
|Date/Time:||Tue, 21 Feb 2006 08:19:35 +0100|
|Subject:||Re: Re: PTGui 5.7 - how to use the antialiasing filters ?|
Yes, those result surprised me too some time ago when I tried to speed
up the dll.
The speed differences are much smaller than expected: I looked at the
code and I understood that most execution time was spent in geometrical
tranformation, not in interpolation code, so changing the interpolation
code has a small impact on the total time.
When I realized it I developed what has been called "fast transform",
reducing the transformation time at the price of a (very) small image
Erik Krause ha scritto:
>On Monday, February 20, 2006 at 15:38, Thomas Rauscher wrote:
>>EK> And do you have any estimation about execution times?
>>I would say 50% to 100% slower than the original filters without fast
>Ok, I've done a quick test on my machine. The results are quite
>surprising. Here the list for a remap from 4000x2000 equirect to 6
>cubefaces with 1200x1200 each. I've used a modified version of my
>cubefaces batch file with fast transform turned off.
>filter number and execution time (mm:ss,0)
>Filter 8 to 21 are the new anti-aliasing filters. Interesting that
>only the older low quality interpolators poly3, bilinear and nearest
>neighbor are slightly faster. The sinc filters are significantly
>If anyone wants the batch files for own tests please mail.
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