----- Original Message ----- From: "Vladimir Dergachev" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Sunday, May 12, 2002 8:24 PM Subject: Re: [Xpert]Using Xv to display odd/even fields from a TV camera
> > > On Sat, 11 May 2002, Paul Robertson wrote: > > > > > 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 > > > > > Its closed source commercial stuff I'm afraid. > > Ohh. Well in this case this will stay unsupported.. > > Vladimir Dergachev > Well, I'd still like to get involved if I can. I have a Bt848 capture card somewhere, I'm sure I can write some software to capture odd and even TV fields and display them using Xv... -- Paul _______________________________________________ Xpert mailing list [EMAIL PROTECTED] http://XFree86.Org/mailman/listinfo/xpert
