NUI Group - Open Source Interface

Some questions about my LLP 1.6 x 0.9 project

2010-03-20T06:22:34-05:00

Hey!

I have decided to go for LLP technology for a wall since i will have it in some places where there will be ambient light.
I have put an order from peauproducts as follows:

- 4 850 nm 5mW inrared lasers
- 4 laser line generators 120 degree
- infra red safety goggles
- modifyed ps3 camera with m12 mount and 850 nm band pass filter
- 3.6 mm 73 degree normal m12 lens

Benq MP777 4000 ansilumen projector 16:9 1,6 x 0.9 m from the distance of 2.42m
Wall in plastic (havent bought that one yet)

I am also looking around for back-projection foils. You want a “milky” surface right? so that the projector does not reflects in the plastic. Also you put the diffuser foil on the “back side” of the plastic, am i right?

I have found a Chinese company who provides back projection foils. I wonder with one to choose though. I will attach a screenshot of the info and maybe you guys can help me… they have white, double white and gray. And how do you know that they don´t block the IR blobs?

After I put the order, I have done some more reading and I am afraid that I bought to weak lasers for my size? Any one have tried to set up this size with four 850 nm 5mW lasers, one in each corner. Another thing I have read is that you only need 90 degree line generators. Will the beam be weaker if you put a to wide lens?

Thanx for a great forum!

//Anders

interactive projection apps

2010-03-18T18:12:19-05:00

Hi,
are there any applications for interactive projection? applications like swiping leaves, or particles...?

Thanks

New 20” failed

2010-03-18T02:17:07-05:00

Hey guys
I recently made a quick attempt to build a small 20” lcd di table.
The frame is up and my only issues are
1 the screen is still transperant the backlight seems sufficiant though
2 the laptop we are using ( win 7 toshiba l30 -1.25g, 40g hdd-) will not allow me to have 2 simoltanious monitors so it is hard to configure
3 the matrix has a mirrored back which is annoying for tracking since it ghosts
4 and finaly the cam is a crappy 30 fps ps1 cam will not stand, any ideas on cases?

thanks a tonne fellas
cheers
Tim

Diffusion layer for DSI?

2010-03-15T10:54:00-05:00

I have my table functioning but there are a couple of things that I need to acquire before I can call it ‘done’ and was hoping someone would help me understand more about them. My table is set up for DSI using Endlighten and EnvironmentalLights IR led strips

Currently I am using resume paper as my diffusion layer, lol. What should I buy to more permanently eplace it? I hear that Rosco grey is good, but all the info I found on diffusion layers seemed to assume I was using FTIR with a gooey silicone compliance layer, which I’m not. What should I use to diffuse (and protect) my table image? I suppose this material will also need to be IR passable so my finger touches don’t get lost.

* Note, I do have an old projector screen in my apartment, could I use that? One side is black rubber though, so I’m guessing no.

How close is your projected image to your surface size?

2010-03-14T15:45:34-05:00

I’ve been trying to tweak and calibrate my projected image size to match the physical size of my surface for some time now and cannot get it to be totally perfect. Just curious about other peoples’ experiences, at what point have you found the projected image to be “close enough” to be good for a MT table?

I’m using a ~42” FTIR table with Endlighten acrylic and a BenQ MP552ST for the projector if that helps anyone.

Multiple instances of reacTIVision on Linux - how to assign configuration file (camera.xml) for each instance ?

2010-03-11T11:01:53-05:00

Hi there.

Just had some first success with having a bunch of FireflyMV simultaneously running on Ubuntu. Only problem is that each instance only loads it’s dedicated camera.xml file only immediately after it’s compiled using make. After restarting all instances refer to the one camera.xml in usr/share. Well, no real idea how to fix this. Can someone out there spread some light on where and how to make sure every instance saves it’s own camera.xml config file.

That would be super-cool.

Thanks, Hannes

LED Suplier

2010-03-05T12:11:44-05:00

hi all
I found a great led supplier in china for ir led strips they have a flat squre top so wide angle of throw either 3mt or 5mt rolls just add 12v psu and they are perfect Being on a ribbon thet can be bent and cut to length. I ran a frame a frame around the inside of my box and they gave perfect coverage. they also do coloured and waterproof
web site ledking.com.cn they are about $100 for 3mt plus shipping.
SID SLOTH

Smart Cameras? Anyone with experience?

2010-03-11T10:51:13-05:00

Is there anyone working with this kind of hardware?

There are great solutions for blob tracking in the machine vision industry that can fit perfectly in a MT project.
Many of them support multicameras, amazing frame rates and very low latency.
We are looking for a solution of this kind for a large rear DI.

Just a couple of example :

http://www.dalsa.com/ipd/products/boa.aspx
http://www.analogic-computers.com/ProdServ/Bi-i/Bi-iv301F.html

Quick DSI test setup

2010-03-04T14:57:41-05:00

Hi guys,

Im trying to test my DSI technique in a quick simple setup, however the CCV software doesnt show any blobs (with calibration).
I’ve read many articles and did pretty good research on this, but shouldn’t it be simple to test a DSI setup with just on layer?

Like this:

====Endlighten Acrylic======== <|| IR Leds (osram sfh485)

IR leds are working fine and I just set a little IR stroke in the corner (2 x 5 leds), so I just want to test if I can make a blob in the corner (so I dont need to fill up every edge with leds)

But the image on the camera stays black.
The webcam can detect IR light (tested it), so Im not sure if its the camera..
Im gonna test an other camera this weekend.

Thx!

Building a portable multitouchbox made of aluminium

2010-02-08T10:07:05-05:00

Hi,

This is our first project. I will update when we have some new things on the box