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3D Stereoscopic Production & Delivery
Discuss 3D (stereoscopic video) acquisition, post and delivery.


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Old June 15th, 2005, 11:11 PM   #1
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possible to shoot in 3d?

Anyone every done this with success?

Here's my idea
Have two camcorders and space them apart and slightly angle them toward each other. later in post sync up the two videos and layer them over top of each other but have one image slightly to the left and the other to the right. If done right and i cross my eyes kinda like in a magic eye book. I would think this would work and give the illusion of 3d. If had success with this by using my digital camera and taking a picture of a camcorder and spacing the images apart, but not over lapping the images.

Anyone have any other ideas on how to shoot in 3d that doesn't require steroscopic glasses(mainly becuase i have no idea where to start).
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Old June 15th, 2005, 11:36 PM   #2
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How could you keep frames exactly in sync? Otherwise, I would think it might just be a blurry mess. And how would you display it?
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Old June 16th, 2005, 12:27 AM   #3
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If the cameras have genlock you should be able to keep them shooting in sync?

2- Display: There are some stereoscopic glasses for computers that are at the consumer level. But:
A- I don't know how easy it is to program/format video for it.
B- On CRTs, a 120hz refresh rate means 60hz for each eye. This can cause eye strain over prolonged periods.

You can also do the 3d with blue/red glasses.
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Old June 16th, 2005, 12:40 AM   #4
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What about 3D HDV? Without transfering to a computer (except a Cell computer), record from the start of each tape and use a DIY split LANC cable that presses record at the same time or you can do it yourself manually. I reccomend 2 Z1s to do this feat. The only downside is that you can only watch it on a DIY Z1 3D rig with both tapes in sync. Could be the closest thing to home video reality!
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Old June 16th, 2005, 05:45 AM   #5
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I was thinking about sync at the shutter level, not at the frame level. How precise is genlock? I thought it just kept two cams within one frame of each other.
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Old June 16th, 2005, 06:07 AM   #6
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Its been done: 3D DVX
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Old June 16th, 2005, 07:43 AM   #7
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I'm not sure if this one ever left the drawing board...

Check the bottom of this page:
http://www.dvinfo.net/canon/articles/article58.htm
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Old June 16th, 2005, 08:25 AM   #8
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There is something in the stereo photography world called a "Beam Splitter". Basically it is an adapter you put in front of a camera lens.[Look at B&H Photo for the Pentax Stereo Adapter] The adapter consists of two mirrors--each seeing what the left and right eye would see.

The picture that is recorded/photographed is split down the middle. So you have a 2 vertical pictures with some black banding down the middle.

But when you put on stereo glasses---and put your nose directly in the line between the pictures...both pictures will merge into a 3d photo.

It works--but the field of view is very narrow.

I think the easier way *is* to use two cameras simultaneously to record.

The on playback---feed each individual left right LCD on those eye video glasses/goggles and voila---BRAINSTORM!

Of course--make sure to record the sound with BINAURAL microphones...
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Old June 16th, 2005, 08:50 AM   #9
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I think you have a beam splitter confused.

A typical beam splitter is nothing more than a partially silvered mirror. Some fraction of the light goes through, another fraction is reflected. There was an article about someone using a beam splitter to break up the incoming light and send 1/2 an image to 2 cameras, doubling the resolution of the acquired image, but this will never give 3D.

True 3D requires (at least) a stereoscopic setup... and this is really only horizontal 3D. The vertical dimension of the image will have no depth - so if you rotate your head, the illusion will fail.

-Steve
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Old June 16th, 2005, 10:51 AM   #10
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I think the terminology is probably misused--but it is what I'm repeating.

However, the Pentax stereo adapter*is* 3D. It just puts the left and right images onto one frame of film/video just like pictures from a Viewmaster--except the picture is side by side on each frame.[Parallel format]

Loreo also makes a new stereo adapter--it should work in front a video camera too[but probably a very narrow field of view.]

You can see some of the stuff here:

http://www.3dstereo.com


http://www.loreo.com/pages/products/loreo_3dcap.html
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Old June 16th, 2005, 01:01 PM   #11
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there are tons of product (gadget?) doing this from relatively cheap to awfully expensive.
Anyway, if 3D was really something big, we would have it from a long time.
The only problem until today was really the projection step.
Since it is partially solved with new 3D lcd, you can imagine it will spread a bit better, but it still an exotic stuff.
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Old June 16th, 2005, 11:24 PM   #12
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Eric,
Yes, it's possible to shoot very giood 3D with properly alligned (parallel) and spaced cameras (2" apart is a good starting point...the interocular distance between human eyes is generally accepted as 2 3/4" ). You dont need genlock, just sync up the 2 cameras with a clapstick or a hand clap. 30P would be ideal (DVX100a), but 60i works fine. Bring scene from both cameras into an NLE timeline. Sync them up. Pull out all the blue&green from the "left eye" camera using the color curves control in your NLE. Pull all the red from the "right eye" camera.
Superimpose them using the "screen mode" setting.
View the result with Anaglyph (red/cyan ) glasses for a 3D result in color!
These are just basic instructions...tweak the X-Y relationship between the left & right eye settings to enhance the 3D effect to taste.
Have fun!

Ken
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Old June 27th, 2005, 12:09 PM   #13
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Ken, this is exactly what I was looking for!

Does anyone here have an example of this?
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Old June 27th, 2005, 04:43 PM   #14
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your the man ken!!! Thanks =) now i need to try it.
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