Designing a 60” multitouch table. 
Posted: 04 April 2011 05:22 AM   [ Ignore ]
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Hi guys!
I’m an Industrial Design student and i’m about to graduate with a multitouch table project. It’s designed for architects, illustrators, designers who need to integrate their traditional skills with the digital world. So, since the users need to work on it like they work on a normal table, the first thing was to leave space for their legs. An eclosed box would have been a problem, so i chose a FTIR setup and an ultra-short throw projector for data visualization. Here’s a scheme of the concept and some renders.

whatif.jpg

1.jpg

Well..I have some questions about it.

1 - The first one is a design issue: the infrared camera case under the plane is HORRIBLE. I’m trying to design a nice table, so i was wondering if it’s possible to move the camera at the bottom of the “leg”. If the point of view isn’t under the center of the plane, the system will have precision problems?

2 - What if i use this special PMMA for the projecton plane? http://www.holopro.com/en/holoprostart/prolite/
The plane is 18-mm thick and i can’t reduce it: it’s a problem for the total internal reflection?

3 - I’m going to create a prototype in May. The problem is that i lack of any knowledge in elettronic and informatic and i’m not sure i will be able to make it work correctly even if a FTIR setup looks quite simple. If i buy an acrylic plane, a 850nm LED ribbon and an IR camera how difficult is to connect them to the computer?

That’s all for now!

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Posted: 04 April 2011 05:50 AM   [ Ignore ]   [ # 1 ]
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1] nice design, If you tilt the cam and use a proper lens it can work
2) Think the 18mm will work
3) ?

Problem is that the cam also see the legs of the users if they sit.

Also a problem with the projector. Ultra short trow have a offset vertical

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Posted: 04 April 2011 06:09 AM   [ Ignore ]   [ # 2 ]
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i would raison the issue of the external light and ambient light, we all use confined boxes for that matter and you’ll need some testing ot be sure it doesn’t ruined your blobs…

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Posted: 04 April 2011 07:55 AM   [ Ignore ]   [ # 3 ]
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@rogiermars

This projector needs only 3” from the plane to project a 60” image in 4:3 ratio and i’ve considered this offset. I guess it should work.
For the users’ legs you’re right. I’m going to lift the camera even if the steel tubular on the floor should keep chairs (and so legs) outside the camera field of view (but i admit this is a silly solution =P).

Now the camera has this lens http://peauproductions.com/store/index.php?main_page=product_info&cPath=26_27&products_id=70 since there are 55cm between the plane and the camera. If i lift the camera i will need this kind of lens http://peauproductions.com/store/index.php?main_page=product_info&cPath=26_27&products_id=72and it’s ok: but what lens should i use if i move the camera to the left? There is a sort of calculator, as is for distance?

@MashineGun

I’ve talked about this with an Epson technician. He told me that with so little distance the image should be very bright..i’m not so sure however, i guess i should try! =)

Thank you both guys!

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Posted: 04 April 2011 08:19 AM   [ Ignore ]   [ # 4 ]
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hi miro,

i already finished two similar projects with ultra short throw projetors - just start with the screen - once you installed the camera and have ur IR-light source running you will make fast progress in deciding what is the optimal arrangement for ur setup. there are many factors u cannot know… u need to test. lens, keystoning, mounting the projector, ir-light, etc. etc.

i would first buy the acrylic, ir-strip, and cam and try to adjust all parts like you would if they were mounted in ur final setup…

i will be watching - good luck!

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Posted: 05 April 2011 07:41 AM   [ Ignore ]   [ # 5 ]
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i was talking about IR light for the the blobs

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