P3D Re: 3D Video with rear projection

[Andrew Woods <andrew@xxxxxxxxxxxxxxxxxxxxx>]

Lawrence W Kaufman <kaufman3d@xxxxxxxxxxxxx> wrote:
> In San Jose the presentation with the QD
> 7500 Professional Stereoscopic
> Video Enhancement Processor was
> unbelievable. First, the Titanic
> footage was a dual Beta source.
> But the QD7500 doubles the lines
> from the input to give a flickerless
> full color RGB video at 120 Hz
> vertical rate, creating a separate 60
> Hz field for each eye. 

Actually, I don't think the video was projected at 120Hz.
Here's what the equipment was and what it did:
The Titanic footage came as a pair of Betacam SP tapes (one left tape
and one right tape).  The left and right video feed from the two
Betacam SP machines went to a pair of QD7500 line doublers.
The left and right line doubled signals were then sent to a pair of 
3 gun CRT projectors (with circular polarisers fitted to the output lenses)
for projection onto the 3D Black Screen.

As far as I know the QD7500's were being used in 60Hz mode.
i.e. converting standard NTSC (60Hz 480i (480 visible lines interlaced))
 to 60Hz 480p (480 visible lines progressive (non-interlaced))
or 60Hz 960i (960 visible lines interlaced)
(I think it was the latter being used in San Jose).

Incidentally, I've just uploaded photos and descriptions of the 1998
Stereoscopic Displays and Applications conference to the SD&A website.
       http://www.stereoscopic.org
For those who are interested in presenting a paper at next year's conference
abstracts are due June 29...

Cheers,
Andrew Woods.         http://info.curtin.edu.au/~iwoodsa

p.s.  Lawrence, why are your lines always so short?


------------------------------