I’m still finding my way around here, so sorry if these have been answered elsewhere.

With DSI, how exactly can you switch between FTIR and DI? I’m not sure I really want to go that way because of the need for EndLighten Acrylic.

Also, what are the differences between LCD and projector based screens? I have neither a projector or an LCD so I’m not sure about a cost difference, but I’m also just starting so I’m not sure of the differences in practicality and ease of building.
Thanks

Thank you so much, this clears up so many questions!

I’m interested in an FTIR solution but I don’t know if I’m up for building it from scratch in my tiny apartment.

Does anyone sell pre-built FTIR surfaces? Has nuigroup considered this?

OK… i think im going to go with FTIR for my MT. I just need someone who has done this before to help me with it… I know that i WANT to use a glass or plexy glass surface with a projector but im not sure if i can get a projector or get the webcam and im on a tight budget because im paying for my goaile pads and paying for hockey… :l

If anyone wants to help with this pm me :D

hi ,i am have 2 question to ask:
1)From what i had read from here, FTIR and DI are using the same IR techique ( detecting the reflected IR), but why DI can recognize the object shape/marker but FTIR cannot?
2) if i use the IR camera instead of modifying the webcam, it is will give the better detection? what thing i need to pay attention when i use the IR camera?

Thanks you.

Seth,

Thank you for the this thread!

I was a bit over-my-head with all the options and etc… this thread gave me a much better idea of what option to choose.
(okay… so I lied… “WAY OVER my head” would be more accurate)

Just to confirm that I got it right… Assuming that :-

1. I need a SAFE method in case it falls apart. (laser IR is out...)
2. I need a STURDY surface. (due to physical abuse)
3. I need a LARGE AREA. (LCD is out...)
4. I need a SIMPLE method where by someone who isn’t HANDY at all can do it.

Note:
The project is meant for kids ages 7 to 9.  Which is why I want to make sure it’s safe yet it doesn’t fall apart quickly under their “EXCITED” probes.

Answer:
FTIR

Questions:
1.  Compliant Surface - Is there a HOW-TO for this? 
(I’m assuming we’re to “apply” it on top of the Acrylic board… Do I paint it on top or something?)
2.  Infrared Camera.  If I get this, I don’t need to modify a webcam? (I don’t trust my abilities to take things apart… without damaging it)
3.  How do I know how many LED is enough? Assuming I’m using Osram’s 880nm Infrared LEDs.
(ie. Is there a formula? like 1 LED every 1 inch apart and etc...?)

I also want to take this opportunity to thank the whole NUI Group for bringing such awesome work to the general masses.  Thanks for taking the time and effort to bring it down to a level even technical greenhorns like me could understand. (Well… I haven’t TRULY understand it all yet but… erm… *blush*)

Hello, and thank you for this excellent thread with its bounty of information for such a beginner!

I’m curious though as I don’t see any techniques here that do not use cameras; why is this?  I would be very interested in non-camera techniques as what I want to do with multitouch would ideally take up less volume relative to area, as well as less resources than is likely to be related to image processing.

Hello, my name is Steve and I live in Oregon.  I really believe in the touch interface movement, so I put together a resistive touch screen, but now I want more…

I had a couple of idea’s I wanted to toss into the mix.

1: what about a light pen with a single ir led for movement tracking? I know this negates touch, but new things might be possible. Plus it might be really cheap, and it seems it would be very precise.

2: I’ve been thinking of an llp setup with frosted glass as the projector surface for durability and simplicity. May I inquire if any of you geniuses see any potential pitfalls with a setup like this?

PS I mean it. You people are brilliant!

Hello.

Very interesting thread. In the first post, an image is missing at LLP (tracking image).
Could someone re-upload it? I am interested in seeing it.

Best Regards.

You posted a message without content?

no dude, i posted a message and i decide after to delete, so i wrote to the mods, to delete this post