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Old 24th February 2008, 19:26   #201  |  Link
Jeremy Duncan
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Code:
Filter    Support  Taps
Point      0.0001   1
Bilinear   1        2
Bicubic    2        4
Spline16   2        4
Lanczos    3        6
Spline36   3        6
Lanczos4   4        8
Gauss      4        8
This info is from IanD in this thread, first page.

I know I can set ffdshow to resize using lanczosresize, 2 taps.
But the chart I got from ianD shows that in avisynth, lanczosresize uses 6 taps.

So, my question is. Looking at the chart. Does avisynth lanczosresize use 3, or 6 taps?

Also, a quote from IanD,

"All resizers use the same lookup table based MMX/SSE code."

Is this quoted "Code", in SSE only?

Can it be updated to SSE4 or SSE2?
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Old 24th February 2008, 21:31   #202  |  Link
IanB
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LanczosResize use 6 taps (sampling points).

The resizer generates code appropriate to the processor.

It could be updated, but it is already quite fast and other avisynth code has more pressing need of work.
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Old 4th March 2008, 20:55   #203  |  Link
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Does anyone here still have Wilbert's old splineW filter (.dll posted earlier in this thread, but dead link)? I'm in need of his oversharp spline16w...
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Old 4th March 2008, 21:40   #204  |  Link
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http://www.geocities.com/wilbertdijk...04032007-2.zip
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Old 5th March 2008, 01:52   #205  |  Link
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Thanks, I appreciate it!

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Old 31st May 2009, 20:32   #206  |  Link
Gavino
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Quote:
Originally Posted by MfA View Post
I also put Keys paper up if you are interested, it gives the exact coefficients for spline16/36 optimized to match the first 3/4 terms of the Taylor expansion of the signal.
Has anyone got another link for this paper? - this one (two years old) appears to be dead.
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Old 31st May 2009, 22:16   #207  |  Link
mikenadia
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googling, I found this. I do not know if this is the one you are looking for.
http://www.cs.sunysb.edu/~vislab/pap...s96_Taylor.pdf (p5)
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Old 31st May 2009, 23:33   #208  |  Link
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Thanks - that looks relevant, but I was also interested in the original paper by R.G.Keys - "Cubic Convolution Interpolation for Digital Image Processing" (actually referenced in your linked paper).

I've tried Googling, but found only abstracts or references, not the paper itself.
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Old 1st June 2009, 00:15   #209  |  Link
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Quote:
Thanks - that looks relevant, but I was also interested in the original paper by R.G.Keys - "Cubic Convolution Interpolation for Digital Image Processing" (actually referenced in your linked paper).

I've tried Googling, but found only abstracts or references, not the paper itself.
http://rapidshare.com/files/239398655/01163711.pdf.html
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Old 1st June 2009, 01:54   #210  |  Link
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Thanks, Wilbert - that's the one.
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Old 1st June 2009, 02:31   #211  |  Link
mikenadia
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In the last page of the Keys paper, they point out to two different "boundaries" ( or "additionnal" conditions (to match the Taylor series expansion of the sampled function for as many terms as possible) as being may be more optimal (highest order of convergence) and not "second derivatives at endpoints=0". For Spline36 and over.
http: //www.ugrad.cs.ubc.ca/~cs303/2005W2/Handouts/piecewiseCubic.pdf ( 1st paragraph p3)
Thanks. Nice paper.

Last edited by mikenadia; 1st June 2009 at 23:14. Reason: corrected url : thx IanB
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Old 1st June 2009, 07:24   #212  |  Link
IanB
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@mikenadia,

Is this the full URL?
Code:
http://www.ugrad.cs.ubc.ca/~cs303/2005W2/Handouts/piecewiseCubic.pdf

Last edited by IanB; 1st June 2009 at 07:28. Reason: F'ing url compressing vBulletin®
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