PanoTools:
Re: Re: PTGui 5.7 - how to use the antialiasing filters ?
Fulvio Senore 2006-Feb-21 08:19:35
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
distorsion.
Fulvio Senore
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
>>transformation
>>
>>
>
>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)
>
>0 00:41,9
>1 00:40,1
>2 00:43,6
>3 02:28,9
>4 00:46,7
>5 00:37,8
>6 00:37,2
>7 05:32,6
>8 00:41,8
>9 00:41,8
>10 00:41,9
>11 00:41,6
>12 00:42,0
>13 00:41,6
>14 00:41,6
>15 00:41,6
>16 00:41,6
>17 00:41,7
>18 00:42,1
>19 00:44,9
>20 00:43,8
>21 00:42,9
>
>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
>slower...
>
>If anyone wants the batch files for own tests please mail.
>
>best regards
>
>
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