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

["Marcus Warrington" <marcusw@xxxxxxxxx>]

Gerard

>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.

As other people have already said the most practical way of home 3D video
making is with a NuView (I bought one myself a few years ago and have been
very pleased with it). It does suffer from vignetting at wide angle even on
my SONY camcorder which it was designed for. Well actually it probably
wasn't
designed for any particular make of camera, but its native filter thread
size (for attaching the device to the camera) is 37mm, and the only
camcorders
I know with filters this small are Sony's (for any other camera a step-ring
must
be used). The vignetting is actually the barrel of the NuViews lens bezel
intruding into shot. On my SONY I have to zoom in one nudge get rid of a
small
black shadow along the top edge.

Some one said that a problem with the NuView is that it creates only
Field-Sequential encoded videos. True, but if you then capture this to
a digital stream for non-linear editing you can then extract these two
streams and convert to any other format you want..i.e. Under/Over,
Side-by-Side or Anaglyph. There are a number of plugins for Adobe Premier
to help achieve this.

I think someone else mentioned that it should also be possible to create
anaglyph movies directly with the NuView by placing coloured gels on the
front of the device. I haven't tried this myself YET, but its been on my
"to-do" list for over a year now. The thought first occurred to me because
of the amount of non-3d "double image" video I've shot simply because I
continually forget to actually turn the NuView ON. When its not on, both
LCD panels are open and allow light through so both overlapped images are
recorded. I tend to turn the NuView OFF when setting the convergence
(prior to shooting), because its easier (for me) to see the convergence when
the viewfinder image isn't flickering.

To get back to your particular question, you already have two cameras so
it should be possible to shoot both streams, load into the PC/Mac and then
find the matching start frames from each stream. You might have to use some
form of clapper board system at the start of each shot, to aid you in
locating the matching start frames.From this point its simply a case of
multiplexing both digital streams into one. The plugin
"CULT EFFECTS Vol 1" by Cycore Computers for Adobe After Effects certainly
has a filter that will take two streams (left and right) and convert to
Anaglyph (red/blue or red/green),interlaced (like the NuView) or Stereo
pair (side-by side). It also lets you dynamically set the convergence.

I would question your intention of wanting to use Anaglyph. In my
experience I've never find it to work for video tape.. it just doesn't
have the bandwidth available to preserve the colour encoding. Of course
encoding as MPEG2 and storing on digital medium (DVD/CD) is a different
story, this defiantly does work satisfactorily.

Marcus
Marcus Warrington
MIS Computer Services (UK) *RED NOSE DAY - Comic Relief



 

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