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20th December 2007, 19:43 | #1 | Link |
Registered User
Join Date: Mar 2007
Posts: 34
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Which resize filter to use when resizing one axis?
Hello,
I am resizing camcorder footage from 720x480 nonsquare pixels to standard 4:3 640x480. So, the resize is only on one axis. I know BilinearResize is "better" than PointResize, but it also blurs the whole scene which seems unncessary if I am resizing just the one axis. Is this a case where PointResize or something else would be more appropriate? Thanks |
21st December 2007, 02:11 | #5 | Link |
Avisynth Developer
Join Date: Jan 2003
Location: Melbourne, Australia
Posts: 3,167
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Choosing a higher order resizer is a religious experience, a lot depends on your personal preference, the material in question and what you use to view the result. A little bluring can cover a multitude of sins, a little sharpening can subjectively crispen the view experience.
See the installed resizer documentation for a summary. Name - order - description ----- - ----- - ----------- Point - 1 - Nearest neighbour, crude and fast, ALIASING! Bilinear - 2 - Average of 2 neighbours, less crude, fast, blurs. Bicubic - 4 - bicubic spline thru 4 neighbours (tuneable b & c) Spline16 - 4 - spline (sinc approx) thru 4 neighbours. Lanczos - 6 - sinc thru 4 neighbours. Spline36 - 6 - spline (sinc approx) thru 6 neighbours. Blackman - 8 - sinc thru 8 neighbours, less ringing. Gauss - 8 - Gaussian average of 8 neighbours, (tuneable P). Lanczos4 - 8 - sinc thru 8 neighbours. Spline64 - 8 - spline (sinc approx) thru 8 neighbours. Lanczos(Taps=3) and Blackman(Taps=4) allow number of taps to be increased, order is 2 times taps value. |
22nd December 2007, 21:57 | #6 | Link |
Huh?
Join Date: Sep 2003
Location: Uruguay
Posts: 3,103
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I recall a number of opinions in the Spline64 thread where the concensus seemed to be that Spline36 looked better than Spline64.
Where can I find more info about Blackman? When was it added to Avisynth?
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22nd December 2007, 22:17 | #7 | Link | |
x264aholic
Join Date: Jul 2007
Location: New York
Posts: 1,752
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Quote:
In fact, if you're working at SD resolutions doing a simple stretch from 720x480 to 864x480, I've found there's little difference between the various resizing algorithms. |
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22nd December 2007, 23:26 | #8 | Link | |
Avisynth Developer
Join Date: Jan 2003
Location: Melbourne, Australia
Posts: 3,167
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Quote:
It was added for 2.58/2.6 along with Spline64. There is a pluggin version somewhere. Search the Developer forum. |
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