On Fri, 10 May 2002, Mark Vojkovich wrote:
>
> We talked about some standardized method within the current API
> for telling the drivers to display fields. This was done through
> PortAttributes. I'm not sure if anyone actually implemented this
> in their drivers though.
>
>
> Mark.
>
>
> On Fri, 10 May 2002, Paul Robertson wrote:
>
> > I have some software which uses Xv to render images acquired from a TV
> > camera in something like realtime.
> > Currently we only capture even fields, and we scale the image vertically by
> > 200%. It looks OK.
> >
> > Now we need to start working with both odd and even fields. If we do that
> > with our current software, the picture wobbles up and down.
> > If I write some code to adjust the position of the odd field, the picture
> > still looks wrong, particularly if nothing is moving in the picture.
> > If I write code to reconstitute a full frame by interlacing the odd and even
> > fields, then I see nasty artefacts when there is horizontal motion in front
> > of the camera.
> >
> > We actually use ATI Rage and the r128 driver at the moment, but a while ago
> > we evaluated the i815 graphics controller. I remember that it supported a
> > number of different hardware scaling methods including "Up interpolation"
> > and "Down interpolation", and I wondered if I could use these modes to get a
> > better quality picture.
ATI hardware does support this but the driver does not do this (yet?).
What software do you want to use this with ? Is the source available for
download ?
Vladimir Dergachev
> >
> > Has anyone had to deal with these kind of issues?
> >
> > I should say that CPU time is scarce, as the TV fields are compressed in
> > hardware and have to be decompressed in software.
> > --
> > Paul Robertson
> >
> >
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