P3D Re: 3D LCD projection

[Andrew Woods <andrew@xxxxxxxxxxxxxxxxxxxxx>]

Al Razutis wrote:
> I am familiar with (having used it) with DUAL polarized LCD projectors, hand
> painted large (12 - 18 feet) silver screen, Andrew Woods' affordable de-mux
> box, and my field-sequential video from VCR.

Brian Phillips wrote:
> What exactly is a de-mux box and how does it work?

Since my name was mentioned, I guess I should respond...  ;-)

A demux (or demultiplexer) is a device which splits a field-sequential 3D
video signal (left and right images on the same video tape/stream) into
two separate video signals.  A demux is usually used to polarised project
a field-sequential 3D video using a pair or LCD/DLP/CRT projectors and
a silvered screen.

The setup is as follows:
 VCR playing field-sequential 3D video tape
 -> 3D demux
 -> 2 LCD/DLP/CRT projectors
 -> passive polarisers in front of each projector
 -> silvered screen (or polarisation retaining rear projection screen)
 -> audience wear polarised 3D glasses (cardboard, plastic frame, whatever)

This is currently the easiest and cheapest way of projecting 3D video.

We have demuxes available for sale 
  http://info.curtin.edu.au/~iwoodsa/products/demux.html
Demuxes are also available from QD Technology and 3D Image Tek

A demux has the reverse function to a multiplexer which takes the output
of two genlocked video cameras to create a field-sequential 3D video signal.
But please note that if you wire up any of these boxes in reverse they
won't perform the opposite function.  ;-)

Cheers,
Andrew Woods.

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