RENCI Multi-Touch Table Development - Part 2
Cameras
The touch detection for our direct illumination (DI) wall was originally based on the GC660 GigE camera from Prosilica. At VGA resolution (659 x 493), the GC660 can capture images up to 120 frames per second, but while the Duke wall used 8 of these to cover the image produced by 6 HD projectors, the table only had one camera to cover 2 HD projectors. The result was poor touch fidelity despite the high frame rate…
Prosilica GC Series camera.
We decided to upgrade to the Prosilica GE1650, which offered 1600×1200, but at only 30f fps. because of the aspect ratio of the two HD projectors combined into a single image (approx 1:1), we only capture 1200 x 1200. At 30 frames per second, the response was acceptable.
Prosilica GE1650 camera.
The added resolution moved us from a 1/3″ CCD (fairly standard) to a 1″ CCD, whcih limited our choices of wide-angle lenses. After some experimentation, we ended up using a Pentax 6.5mm F1.8 lens fitted with an IR filter. This was a real challenge since this lens had a fixed focus…
IR Illumination
Because of the reduced aperture and exposure setting for the camera, we used a large number of Lorex VQ-2120 Night Vision illuminators. There are a total of 14 illuminatiors in the table…
Lorex QV-2120 Night Vision Illuminator
Early Development Table made out of scrap 80/20...
Early build of the Table...
« RENCI Multi-Touch Table Development - Part 1
RENCI Mulit-Touch Debut at SC08 »
Comments
Comment from admin
Time: November 28, 2008, 1:51 pm
Thanks. Actually, we did build a “hard” enclosure using plywood and laminate, but it ended up looking too much like a finished production-ready product, which wasn’t what we were looking for. Plus, it’s definitely easier accessing everything underneath using the skirt.
Thanks, again.
Warren
Comment from online games
Time: April 29, 2011, 1:24 am
Heya this is kind of of off topic but I was wondering if blogs use WYSIWYG editors or if you have to manually code with HTML. I’m starting a blog soon but have no coding expertise so I wanted to get advice from someone with experience. Any help would be greatly appreciated!
Comment from admin
Time: April 29, 2011, 9:50 am
Wordpress is WYSIWYG.
Comment from Harry van der Veen
Time: November 28, 2008, 6:09 am
I really enjoy your blog and I like how you did the cloth around it, easy does it
I bet it saved you a lot of time opposed to building a “hard” chassis case around it. Congrats on being at such a nice event.