Friday, February 12, 2010 Prehistoric 3D Imaging and a Starter Project for the Computer Clubhouses

Okay, so 3D photography has been around for a while. Basic black and white photography became common in the second half of the 19th century. An early method of seeing those first photographs in 3D was called stereoscopy. Stereograms or stereoviews are basically two copies of the same picture placed side by side on a card and viewed with a special stereoscope viewer that creates the illusion of the two images being overlapped. Because the two pictures aren't exactly the same—they are both pictures of the same subject taken at the same time (shot with a twin lensed stereoscopic camera) but separated by a small angle (parallax, approximately the distance between your eyes) which creates a slightly different perspective for each image—the overlap creates a sense of depth, which renders the view in 3D. Stereoviews were a popular novelty format in the 19th and early 20th century, and you can find many reproductions of interesting, early stereoview images on the web, and even the cardboard mounted originals in antique shops and flea markets that carry photographic items.

At the moment, especially with the release of the movie Avatar in 3D, among many other highly regarded commercial 3D releases (Up, Coraline, etc.), 3D imaging seems poised to take over commercial media. According to various experts (disclosure: I'm not a 3D or media expert), next year will see the release of many, 25, a billion, an uncountable, unimaginable total of 3D releases in movies, television, the web, and doctors' offices (disclosure #2: I'm not a doctor). Okay, now the Big Disclosure: Avatar is the first contemporary, major 3D release I've seen. Prior to that I'd only seen a 3D short on Siegfried and Roy (that's right, the stylish, and not always so successful tiger tamers and Vegas magicians). Don't ask. And that was in Imax and the 3D “goggles” were actually a helmet. My 9 year old daughter was amused, and frankly, the experience, as the saying goes, was so bad it was good. Kind of like a Ken Russell BBC movie but with Siegfried and Roy (rather than Beethoven). Prior to that, the last most contemporary, commercial 3D release I saw was in fact a 1982 re-release of Alfred Hitchcock's Dial M for Murder in which the action takes place almost entirely in a small, single room. And it was brilliant (I wouldn't be as succinct re Avatar). Dial M for Murder was made, originally in Natural Vision 3D, in 1954. The same system that was used for the earliest forays in commercial 3D motion pictures, Bwana Devil and House of Wax.

So I'm not a total 3D fanatic. But it's here (we live in it) and I have to deal with it. And if you're at this blog, you do too. Most likely you have something interesting to add on the subject besides endless praise and bowing to the masters of big budget, do-it-with-LOTS OF OTHER PEOPLE'S MONEY 3D. There's certainly enough of that going around and frankly, it's almost enough to make you want to work in 2D!


Let's play with stereoscopy. This is kind of an unusual approach, and can be done without taking a new photograph, which is especially convenient as you probably don't have a special, twin lensed camera (I don't, but would like one if you've got an extra). If you do, go shoot something and come back with it. Basically we're going to animate existing stereoview images to recreate the illusion of 3D (albeit with a bit of wiggle, see below). Plus it's a cool, paracinema technique, which, being more of a film person than a 3D modeling person (actually, I'm not any kind of 3D modeling person, that's Leontyne's area), is appealing to me. And you get two projects in one: 3D and film animation.

Matthew Schlanger, an old friend, media artist and president of the interactive media company, Black Hammer Productions, created the gif images above back in the previous millennium from some old stereoview images. Here's what he has to say about them:

"Prior to working with the web, I explored alternating view 3D with video. In the 70s and 80s, analog video sequencing tools offered a simple way to achieve nice alternating 3D results. (At one point I built a box for my SVA students that allowed them to create wiggle 3D as well as alternating field 3D.) When building our website, and this was in the early days of website development, it seemed natural to use this new thing called an animated gif to create wiggle 3D images. What you see here are some of the results."

Here's a tutorial I created (bear with me, this is my first attempt at one of these) that quickly demonstrates how you can turn an existing stereoview into a 3D animated gif like the ones above. (I'm using Photoshop CS4 but you can do this with almost any image editing software and even in very old versions of Photoshop with the Image Ready component for the animation portion of the project.)

How to Convert a Stereoview into a 3D Wiggle Animation from Computer Clubhouse on Vimeo.










Butterfly photo by OliverK. Ornament dealer photo by T. Enami.

Here are some links to wiggle animation collections online:

3D Stereoviews of Meiji-Period Japan

Animated / Wiggle stereoscopic

Stereo Animation


Leave your comment 10 comments:

Chris G. said...

Thanks Fred, I can't wait to see what comes next.

ASC connections said...

Fred is a Genius! How can this be applied in a finished project?

SB said...

Cool!

Fred Riedel said...

hey asg. there will be an entry coming up re how to turn a single 2d image into a 3d anaglyph (red/blue) image. it won't be wiggle animation, just a still. that said, you can create stereoviews w/o a 3d camera. the butterfly stereoview was made w/a single lens camera. you just have to experiment w/slightly moving the camera (about 6.5 cm) to approximate the space between your eyes in order to reproduce the angle of parallax. it takes some practice. once you've got a stereoview you can photoshop it into a wiggle animation as demonstrated above. let me know how you make out.

ASC connections said...

What a cool project! Thanks Fred

Karen said...

Nothing intelligent to say, just, "Love it."

Anonymous said...

Very interesting!

Question: Why does anaglyph require two different colors? Why couldn't I make make a 2d image overlay (called a butterfly stereoview- correct me if I'm wrong) by only shifting the camera and overlaying the two images by changing the opacity of the top layer?

To clarify: The bottom layer would be a photograph, for example of my hand from bird's eye view. The second layer, at approximately 50% opacity, would be at 6.5cm rotation from bird's eye view of my hand in the same position ... maybe the opacities would both have to be 50% with the addition of a solid bottom layer. Anyway, the point of this detailed and hypothetical procedure is to help you guess why or why not I will successfully recognize the 2d image as a 3d image. Let me know your thoughts. And I apologize if you mentioned this somewhere on your home page. I regret not having time to do a more thorough scan.

Keep writing!

Fred Riedel said...

well, there are different ways to create or emulate 3d imagery. anaglyph is the technique using red and blue filters. this approach causes the visual cortex in your brain to fuse the imagery into 3d (http://en.wikipedia.org/wiki/Anaglyph_image). however, there are other ways to create the illusion of 3d imagery from 2d photos or other images though i'm not sure that the method you describe would work except maybe with cross-eyed viewing (another technique that's popular and accessible on the web). if you have any luck, let us know. thanks for the comment.

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