Re: Inverse Distortion Correction
Orad Hi-Tec Systems (orad_u++at++netvision.net.il)
Mon, 03 Feb 1997 16:10:13 +0200
Ran Yakir wrote:
>
> On Feb 3, 6:53am, WILLIAM_MARINELLI++at++ntsc.navy.mil wrote:
> > Subject: Inverse Distortion Correction
> >
> > I seriously doubt this has anything to do with performer but I have
> > alot of respect for the participants here, many of whom have helped me
> > here a number of times. I just started your Monday with flattery,
> > you're welcome.
> >
> > We have some dome simulators in which the distortion correction is
> > done in the image generator.
> >
> > There is some interest in having the out-the-window scene (5 channels)
> > Tee'd off to a sort of ops center. In that case, "flat" video would be
> > great. I know, why not do the distortion correction in the projectors
> > instead of the IG? Unfortunately, we may have painted ourselves into a
> > corner on that one.
> >
> > Do you suppose it is possible to get something like an O2 and write a
> > program that (1) reads a video signal from a distortion corrected
> > image and then (2) loads the frame buffer with the corresponding
> > uncorrected image?
> >
>
> Loading video signal into texture on O2 is quite fast, but I'm not sure that
> the overall performance (loading video & drawing the texture undistorted) will
> be good enough. The O2 is very fill limited, so you'll have trouble drawing to
> a large window. Also, the video comes in fields. If you want to work 60 Hz,
> you'll have to load fields. Otherwise, you can load frames at 30 Hz.
> I'd assume that on 30 Hz, drawing to a video sized window, you can do it.
>
The O2's fill rate is fast enough to texture-fill a frame-size window,
at field-rate (720x576 fill at 50 Hz, 720x486 fill at 60 Hz, etc.).
The video grabbing into "texture" memory ( = normal memory) is done
in parallel to the rendering, so no problem there.
If someone could only get the O2 graphics to framelock to video
(sigh...)
Moshe Nissim
Orad Hi-Tec Systems
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on Mon Aug 10 1998 - 17:54:35 PDT