ReacTable & 64 videos

  • http://www.vimeo.com/3899690
    http://www.vimeo.com/3899761
    http://www.vimeo.com/3899842

  • dude... very interesting... very interesting indeed...

  • raad..

    to refresh, does the reactable use diffuse illumination?

    i'm dying to figure out how to manage "fiducials" for FTIR... certainly it will involve some sort of protrusion rather than just ink, but still...

  • how much does it cost??

  • @soundcyst I spent a while last night looking into multitouch like the Reactable, and it seems like most people who have FTIR systems use a thin layer of silicone on top of their acrylic screen to improve the coupling between finger and acrylic. I was thinking that good fiducials for FTIR would be simple shapes of various sizes (solid triangle, open triangle, solid square, open square, etc.), which if they're heavy enough should be able to press the silicone and have the shape be recognized by the camera. Of course here you run into the problem of sliding or rotating the shapes like in the Reactable demo videos, since the silicone is kind of grabby, and I'm not sure how to overcome that. I'm thinking a system like this might be my next project in the coming months, so we'll see.

    @petermatthew They're not selling Reactables yet, so no one has any idea. The visual recognition software they use is free on Sourceforge, though, so you can build your own if you want.

  • actually... i think if you speak directly with sergi jorda in pompeu i fabra university in barcelona, he might cut you a deal... i mean, he did for bjork... so why not you?

  • peter, also check out http://nuigroup.com/forums/

    tekym, i knew about the silicone thing. hadn't thought about the relatively frictionless aspect of the fiducials though..

    my thought process was more practical than expressive since i'm building a large table for an engineering lab.. coffee mug recognition, for instance, possibly using a coaster with a fiducial.

    if you take a table on as a project and wanna chat about it, hit me up. i'm spending the next 10 weeks on a 4'x6', multi-camera, multi-projector project. blog progress at http://soundcyst.scimp.net if you're interested.

  • @genko Well...Bjork is Bjork. She's got clout that way, and building one for her is great publicity for the forthcoming Reactable company. Not so much most other people. It'd be nice though.

    @soundcyst You mean like recognizing whose coffee mug is whose? The silicone grabbiness probably wouldn't be a problem then. What if, instead of the table having the silicone, the objects do? I was thinking an easier method to improve fingertip coupling than the silicone would be simple latex/polyurethane medical gloves. Slightly unwieldy, maybe, but it might be worth a shot. Or, I think I remember reading something about people putting a very thin layer of oil on the acrylic, to the same effect; this might work better with objects than silicone does.

    Coasters with silicone on them rather than on the table would be excellent, I think, because you could raise the coasters slightly using the silicone, so that there's a square or whatever shape the coaster is suggesting that it's a coaster, with a given pattern of dots inside it as unique identifiers.

    At this point I'm just thinking and planning, I have no money to start on another project yet. Perhaps summertime. I'll check in on your blog every now and then, though, thanks. :)

    I just thought of something else. Maybe, instead of trying to get the fiducials recognized by whatever method of pressing them onto the table, maybe the fiducials actively give off IR, so that they don't need to press and the camera can still see them. Maybe custom-build coasters/platforms for other objects with a given pattern of IR LEDs on the bottom.

  • not so much whose is whose, but more "oh, there's a coffee mug in this region, so i know that i shouldn't be looking for touches or gestures there"

    > What if, instead of the table having the silicone, the objects do?

    exactly.

    > Coasters with silicone on them rather than on the table would be excellent, I think, because you could raise the coasters slightly using the silicone, so that there's a square or whatever shape the coaster is suggesting that it's a coaster, with a given pattern of dots inside it as unique identifiers.

    again, exactly.

    active emitting fiducials would be cool, but the biggest drawback i see for that to happen is power. there is, however, ir reflective paint that we plan to look into further.

  • also, answering my own initial question, yes, DI: http://reactivision.sourceforge.net/images/reactivision03.png

  • Power could be from watch batteries, maybe, or better yet cellphone batteries. Thin, rechargeable, extremely abundant (if not super-cheap), and with enough capacity to power a handful of LEDs for months on a charge, I'd bet.

    Reflective paint is a good idea, especially if the non-painted areas heavily absorb IR (or you paint them with something that is). I hadn't thought of that.

  • I will keep all Reactable and Bjork comments to myself. :p