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
>
> 1) The help for ivtvctr says to see the API Doc. for information on the
> settings of the dnr_*. However no such document is included in the docs/
> directory. The closest think I could find doc/video-quality.txt which in
> inaccurate. What I take it ment was
> http://ivtv.sourceforge.net/firmware-api.html
> However this document was hard to find and not linked to anywhere in any
> of the user docs that I saw. I found it by searching the devel list.
> This document should really be included with the distribution. Or at
> very least video-quality.txt should be corrected.
>
> 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).
Hans
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