"Ian" wrote in message
...
In message , Kennedy McEwen
writes
In article Dj2%n.225175$k15.24811@hurricane, Stephen
writes
"Gary" wrote in message
news:6HZ_n.180653$m87.37557@hurricane...
I wonder why there aren't any after market 3D TV converters.
Surly any 1080P TV could display in HD 2 images sequentially and a
transmitter like the Sony one would work. with any TV. It could be
added
to the HDMI line in and possibly need a knob on it to adjust the sync
when
first installed.

I guess the problem is that it's a 50 Hz refresh rate on the HDMI input.
Even if the TV uses a much faster refresh internally, an external
converter
can't access the video path at that stage. So you're stuck with 50 Hz
which
would have to be halved to 25 Hz for each eye. That would mean
intolerable
flicker and probably give people epileptic fits.

Been there, done that and no, it doesn't!

I used a standard 50Hz video system to produce the stereo video system
that was used for a lot of the underwater footage during the raising of
The Mary Rose back in the early 80's. It was also used for stereo vision
on North Sea Oil submersibles. That system just put odd and even fields
to each eye, blanking the unused field, and there wasn't a hint of
flicker, let alone epileptic fits. Simple analogue switches operated by
field identification resulted in video which was easily recordable & also
broadcast compatible - as demonstrated by TVS when they broadcast demo
footage of this and other stereo systems around 1985/6. No reports of
epileptic fits or flicker problems were received - just complaints from
people who didn't get free filtered specs* in their TV Times that week!

Its a funny old thing human visual perception - I was surprised myself how
easy it was to view with only 25Hz on each eye and how quickly you became
totally immersed in the footage. In those days colour cameras were much
lower resolution than equivalent B&W cameras, so we had one system which
used a colour camera and a high bandwidth B&W camera as a stereo pair.
Surprisingly, you perceived a full colour image at much higher resolution
than the colour camera can reproduce - along with depth perception and,
again, not a hint of flicker.

*The coloured glasses were only required for the demo broadcast - the
source system used circularly polarised filters on CRTs and matching
polarised glasses for viewing.

Speaking of human visual perception,

http://www.itproportal.com/portal/ne...x-million-brit
s-cant-see-3d/
--

I can't see 3d -- I have a lazy eye.

--

Brian Gregory. (In the UK)

To email me remove the letter vee.