On Fri, 7 Apr 2006, Nicolas MAUFRAIS wrote:
> Stefan, I thank you for all the information, but... how could I use an
> "horizontal lowpass-filter"? I read all the things you wrote, and even
> if that's probably right, I don't know how to test it.
I think I mentioned 'y4mspatialfilter' in an earlier posting.
y4mspatialfilter is, as the name implies, a spatial only (not temporal)
filter. It is a "low pass" filter - you specify what percentage of
the bandwidth to pass.
For example, to reduce the bandwidth to 92% for the Luma and 90% for
Chroma try this:
y4mspatialfilter -L 5,0.92,5,0.92 -C 4,0.9,4,0.9
The '5' and '4' are the number of taps in the filter.
The two percentages are the X (horizontal) and Y (vertical) respectively
so if you wanted to leave the vertical bandwidth alone you could use
y4mspatialfilter -L 5,0.92,1,1.00 -C 4,0.9,1,1.0
y4mspatialfilter -h
will give a complete summary - no manpage (sorry).
Experiment lowering the percentage until you notice the softening/blur
and then go back up a few percent.
Cheers,
Steven Schultz
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