Duke Multi-touch Wall Development - Hardware Part 1
RENCI’s initial foray into this area of research has taken the form of the 13.5-foot wide x 5-foot tall multi-touch visualization wall that was installed at the RENCI Duke Engagement Center in the beginning of May 2008. The wall sits at the end of the Engagement Center’s primary collaboration space:
This 6-projector (2 tall x 3 wide) rear projection display provides over 12 million pixels of resolution and uses direct illumination (DI) with 8 infrared cameras to track touches across its coated acrylic screen. A RENCI-modified version of TouchLib and a custom gesture library will allow users to interact with large high-resolution images for medical and disaster response applications.
- Visual Resolution: 6 HD projectors ~= 12.4M pixels across 13.5-foot x 5-foot span
~= 1330 rendering pixels/sq inch
- Touch Resolution: 8 VGA cameras ~= 2.46M pixels across 13.5-foot x 5-foot span
~= 262 touch pixels/sq inch
- Approx. 5 visible pixels per touch pixel
Setting the size of the screen… By laying out the modeled projector frustrums, we could see where the cameras and illuminators could exist without throwing shadows.
See Hardware Part 2 for more…