On Mon, 10 May 2004, Dan Scholnik wrote:
> Out of curiosity, how did you settle on all these different filter
> lengths?
No specific reason - seemed like something to try, and perhaps
speed things up slightly.
> You might even try running y4mspatialfilter before and after y4mdenoise
> in case the latter introduces any high-frequency artifacts.
I did run the two other cases - and the one with y4mspatialfilter
_after_ y4mdenoise didn't seem to do much, if anything.
Hmmm, could really use a 4-way system what with all the filters
stacking up ;)
> Nominally, raising the "length" parameter (actually the DC group delay
> of an infinite-impulse response (IIR) lowpass filter) increases the
> amount of filtering done; but if the thresholds aren't also raised what...
> of motion or really bad noise, raising -l alone won't improve things.
> My "standard" set of values is "-l 1 -t 4","-l 2 -t 6", and "-l 3 -t 8"
> for light, medium, and heavy filtering.
Ah, super - I often wondered when one should raise the threshold (-t).
Thanks for the tip!
Cheers,
Steven Schultz
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