On Saturday 29 October 2005 19:49, Kevin Atkinson wrote:
> On Sat, 29 Oct 2005, Hans Verkuil wrote:
> > On Saturday 29 October 2005 18:14, Kevin Atkinson wrote:
> >> I have several issues with the Dynamic Noise Reduction (DNR) filter.
> >>
> >> Using version 0.4.0
> >>
> >> 2) It seams that dnr_spatial only has an effect when capturing at
> >> 720x480. When I set to to anything lower (such as 480x480) this setting
> >> has no effect. I can tell be setting it to 31 so that there is horrible
> >> ghosting artifacts when capturing at 720x480 but not at ANY other
> >> horizontal resolution. I have a PVR-350. If you need more specific
> >> info please let me know, preferably with an explanation of how to get
> >> it.
> >
> > This may be related to the fact the dnr_temporal is forced to 0 by the
> > driver if the resolution is anything other than 720x480 (or 720x576 for
> > PAL). I'm not sure what the effect is of spatial DNR if the temporal DNR
> > is disabled, but my guess is that it is not easy to detect (if it works
> > at all)
>
> Oops. I meant dnr_temporal. So the driver forces it to 0. Is there a
> reason for this. Is it due to a hardware limitation, or something else?
> BTW: dnr_spatial still seams to work.
Setting dnr_temporal to non-zero for non-fullsize resolutions leads to
ghosting. So it's basically useless for those resolutions. Since it generated
various ghosting complaints from people it was decided that the easiest route
was just to disable it. So any value you set for dnr_temporal is only in
effect when capturing fullsize.
Hans
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