Multi-Touch Research Platform (Lancaster University, UK)

Hi everyone,

first, thanks a lot for all the inspiration and helpful information that can be found on these pages! Finally I managed to put together some more detailed information about the multi-touch table we built. The design is quite flexible and it can be used with either DI or FTIR. It features the following components:

• 91x57cm surface (107cm diagonal, 16:10 aspect ratio)
• Toshiba TDP‐EW25 projector (1280x800px)
• Point Grey Firefly MV camera (640x480px, 60fps) with wide-angle lense
• Infrared illumination (850nm)
• Bosch Rexroth aluminium frame

There is more information on the table setup, including a technical report with some building instructions and drawings.

-- Dominik

Awesome guys.  Looks very well done.  Any videos of it in action?

wow, looks good.

nice design

Hell yeah i used blue tac on my ND filter too!  ( although i presume thats a hot mirror? ) Nice frame expensive stuff!

Very well done, congratulations!

Thanks, guys! Concerning the action videos: I should put up something soon.

And yes, it’s a hot mirror .

Very well done guys, hope to see a video of it working soon. I really like the design of the box looks like you guys put a lot of effort into it. Good Job!

Wow, this is good looking!
What’s the material you used for the box?
I also thought about something like that, but isn’t it very susceptible for scratches?

Thanks! The frame itself is made out of 40x40mm aluminium profile. For the case we used 3mm black acrylic sheets.

Brilliant design! How much does it cost to build this table?

Thanks a lot… parts were around £3000, although it’s a bit difficult to say exactly, since not all the part orginally ordered were used in the end.

Hi everyone,

just updated the technical report (http://eprints.comp.lancs.ac.uk/2215/) - it now includes a description of the new DSI setup, using:

• EndLighten acrylic sheet with an IR LED ribbon around its edges, and on top a
• rear projection acrylic sheet, which provides a better touch sensation and is longer lasting then the previously used polyester film

Dominik

--
http://eis.comp.lancs.ac.uk/~dominik/cms/

nice job mate? is th balck acrylic expensive?
we have just built a beauty of a frame/case and i think it would be nive to cover ours in it.
regards
Tim Hawkes

The black acrylic was not too expensive, around £70 total for the 4 sides.

Nice
what material is your surface, I like your table so I think next time round i will use your guide, But I have allready got my opal30(80% transperant) acrylic, Do you think this will work
regards
Tim

It is 8mm Endlighten (0N002 XL) with a 5mm rear-projection acrylic sheet (7D006 RP) on top. Don’t have any experiences with the opal30, sorry.

Dominik

any ideas on how to get a rectangle image 82x67 on tomy surface withnone mirror, i am currently gettin a trampezium?
tim

I’m sure Opal acrylic won’t work. The projected image will likely be too diffused.

Regarding the trapezium: I guess you would have to change the angle between projector and surface.

we player around with our mirrors, out box is in two peices one for a base which connects two a a top, will try to post pics. But about that when i was presenting around 20 mins before the top snagged on my blazez so then it slipped causing the mirrors to move.

how does yours pick up blobs so well and what are your machine spcecs
could u post a screen snip of ccv so i can i get a better idea on the settings
Regards
Tim