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The Magic Cafe Forum Index » » Lights...camera...action! » » Not magic, camera trick, but well... (0 Likes) Printer Friendly Version

EmmanuelM
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Hello,

I am very curious to know what you think of the following video. And first, well, let me know whether you think or not it is worth being discussed here. After all, it's more "technology" than "magic". Even if the answer I often get is, "Hey, how did you do that?"

The URL is :

http://www.youtube.com/watch?v=MKzZWxw7oJA

And the comment I put is :

Virtual studios and offline virtual animations are common nowadays on TV. Fully interactive visual effects are not. Here you can see our augmented reality technology broadcast for the first time by TV Asahi in Japan. At the basis of this visual effect, there is a textured board like in several of the videos I put here. The use of chroma-key to hide completely the real object "in" the virtual studio creates a very nice effect, and I think many viewers wondered "How did they do that?".
Oge
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154 Posts

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I think they are using "blue screen" as a back ground. So if you watch carefully, the man's waiting for a cue before he lifted the screen....

And if you watch carefully again, you will see that the board that the man is holding moved a little bit in the bottom corner...
muzicman
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LaCenter, Wa
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That is all done with CGI and Chroma Key technology. I recently purchased the software and hardware to do this. Check out http://www.seriousmagic.com/products/ultra/

I purchased all 4 Master Set Libraries that will allow me tracking shots and versatilitiy.
Bill Nuvo
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That's some pretty cool software.
Christopher Starr
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Heart of America
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Incredible stuff!
videokideo
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895 Posts

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We use serious magic.... its great software, highly recommended.
Promagia
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The Technique is called Rotoscoping, Is the mix of live video and animation, and is done frame by frame (30 frames per second).
ScottRSullivan
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Actually, this is more a combination of greenscreen, which as has been mentioned above, can be called ChromaKey, and another technology called tracking (both mentioned above by other posters, including the original post)

A Greenscreen Matte is pulled using a procedural method. Most commonly, this is done by subtracting the Red and Green channels of a video, which creates a black and white image that is used as your mask, or Matte.

This is handy, because the matte is generated based on the channels and can be done in realtime with a proper Greenscreen and hardware (just watch the Weather report on any newscast).

The board he picks up is another green board, albeit with "tracking markers" on all four corners. These tracking markers typically are a green "x" that are a different shade of gree than the rest of the board. Though I think he mentions above it is a checkerboard pattern, which is something VERY easy to track.

These points are tracked in a compositing program (I use Shake, for example). The background is added in digitally in the same way, by tracking the movements of the camera.

This is all standard stuff that can be done in real time to create virtual sets.



Promagia, the terms you use are not exactly precise. The mixing of video and animation is called Compositing, not rotoscoping. Roto can (though not always) be a PART of the compositing process.

In this specific shot, there appears to be no rotoscoping at all.

Rotoscoping, technically, is creating a Matte using Spines, Bezier Curves or other vector shapes (Rotoshapes CAN be created on a pixel by pixel basis, but the standard is using splines and vector shapes). This RotoShape is then tracked with an object that is to be removed (or vice versa: the background is removed, leaving the rotoscoped object). A roto mask isn't created with a procedural method like a greenscreen (which is called "Pulling a Key").

I can understand how one would get confused with the techniques and terms used in this field. I do this type of work daily and still can get confused from time to time! So please don't take this as an attack. I just want the terms to be used correctly.

Warm regards,
Scott

P.S.
If you want to see this technology taken to the NEXT level, check out this video. It uses tracking, not Roto.
http://www.youtube.com/watch?v=umbTreYhi......;search=
pghdude80
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The comment on the youtube video is right on. Japanese television uses this sort of thing much more than American or European television. When I was living there, I would flip through the stations just to see what had the most astounding effects...often it was a news/variety show...
The Magic Cafe Forum Index » » Lights...camera...action! » » Not magic, camera trick, but well... (0 Likes)
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