Re: [photo-3d] Digital Video 3D

["John A. Rupkalvis" <stereoscope@xxxxxxxxxxxxx>]

----- Original Message -----
From: "Gerard Stevens" <gerardstevens@xxxxxxxxxxxxxxxxxx>
To: <photo-3d@xxxxxxxxxxxxxxx>
Sent: Monday, March 12, 2001 1:57 PM
Subject: [photo-3d] Digital Video 3D


> Tuesday, 13 March 2001 8:54 am
> I'm new to this chat page, but can anyone give me help regarding making a
3D movie using two identical JVC MiniDV cameras set on a holder to give a 3D
image. I also have editing software, but I have trouble understanding the
RGB concept and how I would treat the images I am editing so I can view the
final movie on my TV through Red/Blue glasses.
> Gerard Stevens

Perhaps I can offer some suggestions, as I have built MiniDV and other
camcorder and camera rigs myself.  Most of my applications are ones that
keep the images discrete (separate channels) all the way to the display.
Anaglyph requires that the images be mixed together, which usually means
some form of genlocking.  Only certain high end cameras are capable of this.
The other route is to use a digital switcher/mixer that is capable of mixing
two internally synched signals (non-genlocked).  I am looking for one myself
that is not too expensive (they usually are).

There is a third possible route, and that is to genlock a pair of consumer
cameras.  I have done this with a pair of Sony Hi-8 cameras, and
theoretically it could be done with any video camera.  Practically, it is
usually such a hassle (mechanically to get to the xtal oscillator and
generator) that it is not worth the trouble, even though it is quite simple
electronically.

Regarding the anaglyph separation, these are usually red/cyan rather than
red/blue (cyan is the opposite of red on the color wheel, and red and cyan
are pretty far apart spectrally as well).  The NTSC and most other video
color systems (including computer monitor signals) are made up of three
primary colors: red, green, and blue.   Since cyan is a combination of green
and blue, the usual method for anaglyph display is to eliminate blue and
green from one eye view, leaving the red, and eliminate the red from the
other eye view, leaving blue plus green (cyan).  I will send a more detailed
reply directly to Gerard.  If anyone else would like to be copied in, let me
know.

JR


 

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