>
> is there a clear way to put the swscale flags on a quality scale from low
to high?
> i.e. is it true that in terms of quality and cpu usage:
> SWS_FAST_BILINEAR < SWS_BILINEAR < SWS_BICUBIC < SWS_X < SWS_POINT <
SWS_AREA < SWS_BICUBLIN < SWS_GAUSS < SWS_SINC < SWS_LANCZOS < SWS_SPLINE ?
I wrote a little program to test this.
I tried to order them from fast to slow and from crude to fine quality on a
single scale.
I found out that I have to remove SWS_AREA, SWS_X, SWS_GAUSS, SWS_LANCZOS
the scale is:
FAST/CRUDE
SLOW/FINE
--------------------------------------------------------------------------------------------------
SWS_POINT < SWS_FAST_BILINEAR < SWS_BILINEAR < SWS_BICUBLIN < SWS_BICUBIC
< SWS_SPLINE < SWS_SINC
SWS_AREA
SWS_LANCZOS
SWS_X
SWS_GAUSS
here is some raw data, gathered by downsampling 640x480 to 320x240 and back
again to 640x480, using mmx+mmx2 on E6400 intel
errors(measured in sum-squared-differences)
SWS_POINT SWS_FAST_BILINEAR SWS_BILINEAR SWS_BICUBLIN SWS_BICUBIC
SWS_SPLINE SWS_SINC
3769328057 2636583475 2155004550 2039237301 1980996866
1951467852 1902084412
time(how much time to downsample, copy and upsample, in seconds)
SWS_POINT SWS_FAST_BILINEAR SWS_BILINEAR SWS_BICUBLIN SWS_BICUBIC
SWS_SPLINE SWS_SINC
1.1034 1.2289 1.7151 2.2899 2.6026
6.719 13.2753
I hope someone finds it useful. if you want the code i'd be happy to
contribute.
Aviad
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