NUI Group - Open Source Interface

Buying Advice. What do you think of this projector?

2012-02-03T18:08:48-05:00

http://www.ncix.com/products/?sku=65775&vpn=GP2&manufacture=BenQ&promoid=1012

What do you think of this one for a ~36” FTIR setup?

I like almost everything about it, DLP (20,000 hrs on normal setting), HDMI, small form factor. I could care less about the iDevice docking, but what I’m worried about is the 200 lumen rating.
I’ll probably end up using this in a mostly dark room anyway, Integrating it into my desk and using for audio applications. (Max/MSP, Cubase, etc) I just wanted thoughts from you seasoned experts.

Cheers!

Outrageous question, feasibility regarding LCD + Compliant surface.

2012-02-03T17:37:03-05:00

I’m not a fan of parallax, so I was thinking of building a MT screen with the TFT display on top of the acrylic. It would be supported by a nice thick piece of plexiglass, but your finger would be able to touch the screen directly.

Has anybody pondered the feasibility of doing the tinkerman method directly to the rear side of an LCD / TFT display?

It would be just like a traditional FTIR but where the diffuser is the display itself. Is this possible? Obviously it is extremely unwise, probably. It would require the display to sit flat on the surface, which might also be a problem. What do you think?

Rookie error, Ordered the wrong LED’s. What are my options?

2012-02-03T01:27:18-05:00

Hi guys,

I’m building a MT surface for an electronics class at school. I’ll spare you the details and get down to the facts.

I wanted to build an FTIR surface and got everything I need to build one, except I ordered the wrong LED’s.

I was browsing around on Peau’s website and pretty much locked onto the Osram SFH4550’s, and ordered 150 from avnet. Peau says they are wonderful for LED Light plane setups because of the narrow angle. It wasn’t until about 10 minutes ago that I actually read the section on his site that says you need much brighter LED’s for an FTIR setup.

So i’m stuck. I have no issues with making an LED-LP setup instead, except that I’ve got a huge slab of 9mm thick acryllic. That’ll be nearly half an inch of space between my touch surface and my projected image. Not too happy about that idea. Is it possible in a LP type setup to put the diffuser on top of the hard surface? (rather than under it?)

Alternately. What if I just went ahead with my FTIR plan, would the 4550’s work anyway? Maybe if I spaced them closer together in the LED frame?

I wont even get into the Projector / LCD dilemma yet. Although with an LED LP setup, I think an LCD would be much more easy than what I’ve read about using one in an FTIR setup would be. But then I’ve still got the problem of a big thick chunk of acryllic between my surface and the image.

Thoughts? Help a newb out!

How to rotate PS3-Eye- images in CCV 1.5 ?

2012-02-03T08:43:06-05:00

Hi Guys,
this is my first post even though i’ve been reading this very interesting forum for quite a long time. Me and and a friend of mine started to build a multitouch system about one year ago. We built a FTIR system and were quite succesfull. We were using a IR-modified version of the PS3-eye and CCV on Windows 7. Most of the time we worked with one camera but with the release of CCV 1.5 and its super cool multi-camera support we decided to use two cameras. As you can see in the pictures one camera is covering the left side and the other one the right site of the screen. In out current setup the images have to be rotated 90° this was quite easy in CCV 1.3, because there was an option in the camera settings to rotate the images. Now using CCV 1.5 the camera settings dialog consists only of Exposure and Gain. We also searched the cemera_setting.xml document but there is also no option for rotation. So we decided to calibrate without rotating the images but this didn’t work out at all. The blobs were at completely wrong places and also moving in other directions then thoose of our fingers. We also tried to rotate the pictures with the Camera driver(CL Eye Platform SDK) but the changes were not unfortunately not transfered to CCV.
So my question is how can I rotate the images from my ps3-eyes.
I hope you can help me and I thank you in advance for your answers!
With best regards Daniel Heidorn from Germany

CCV 1.5 on Win7 64bit not working

2012-01-31T02:13:11-05:00

Hi all,

I’m trying to set up an FTIR screen using CCV on a Win7 system, 64Bit, 3GB RAM.

I’ve first tried to use CCV 1.4 and 1.3, which both cause the OpenCV GUI Error Handler to give back an error when starting up, as soon as a camera (FireFly MV) is attached to the computer:

One of arguments’ values is out of range (Negative ob tot large Argument of cvAlloc, .cxalloc.cpp (107)

Yesterday I found that CCV 1.5 is already available, and tried this one, however, now I get the program window where the video is not working, and when I click on “setup”, it crashes and the OpenCV GUI Error Handler gives back

Incorrect size of Input array (Non-positive cols ob rows) in Funktion cvInitMatHeader, .cxarray.cpp(182)

I first installed missing dlls from the MS Visual C++ 2005 Redistributable, while during the CCV 1.5 installation I think it installed the 2008 Redist., could that be a problem?

Please help

sonnine

Australia - Correct Glass Surface?

2012-02-01T20:02:48-05:00

We’re working towards building a Rear DI touch table, and we’re not sure what type of frosted toughened glass we’d like to go with.

Would the thickness interfere with it’s ability to create blobs or see fidicuals, and what not.

Any Aussies here who’ve built such a table using glass? what did you use/get?

Help

2012-01-31T06:37:05-05:00

Please guys i need help on the steps on how to setup my PyMT environment. I have followed the example online. When i import it gives me an error.
Please i really need your help. Here is the error i get all the time.

Traceback (most recent call last):
  File "<pyshell#0>", line 1, in <module>
    from pymt import *
ImportError: No module named pymt

Thanks in advance

Interactive panorama of Yekaterinburg. Made with mt4J

2012-02-01T03:05:26-05:00

Hi!

I’m proud to introduce Interactive Panorama installed in Yekaterinburg History Museum. Thanks to mt4J!
It works 24/7 in public space.

Check this out.

[youtube]http://www.youtube.com/watch?v=qW4SEXXpthE[/youtube]

Advertisement shows off some flashy gestures!

2012-02-02T14:14:32-05:00

This is slightly off topic from our traditional hardware/software content. I saw this video when cruising around the inter-tubes today and thought, “There are movements and gestures in this thing that are actually fun and functional—mush share!”

It is a really cool video showing the increasing popularization of NUI as a medium. Science fiction has always lead to innovation.

Check it out if you’ve got a spare minute or two.

[youtube]AFJlIVSARsE[/youtube]

ideas on a large format project

2012-02-01T11:38:14-05:00

hi, i would like some advice...i am totally new, absolutly new in this area...i plan to do a 24x432 inches table, i plan to do lasers instead of leds because they are easier to implement, i just need to detect touch, nothing else.
i’ve been reading a lot about lasers and the danger inherited in that method, about the hard to get even ilumination using leds, etc...i need some ideas and information on a project of this size, ideas of how many lasers do i need, how to power them and any other useful comment and considerations is welcome. since i’ll just use touches is a ps3eye camera array suitable for this project? let me hear you please.