1. HD Touch: Multi-touch and Object Sensing on a High Definition LCD TV Nima Motamedi Simon Fraser University 13450 102 Ave Vancouver, BC, Canada nimam@sfu.ca Copyright is held by the author/owner(s). CHI 2008, April 5 – April 10, 2008, Florence, Italy ACM 978-1-60558-012-8/08/04.

2. Introduction Multi-touch displays and tangible user interfaces. Higher-Resolution Price/Cost Smaller and Slimmer Form Factor Ubiquity of LCD Easier Set-up Longer-Life

3. Introduction Current HD LCD screens are a lowcost,yet highly powerful and robust option for multitouch and tangible interfaces High fidelity and reliable tracking of both fingers and Fiducials that our prototype allows.

4. Related Work 1.camera-projector 2. use capacitive sensors 3. acoustic sensing

5. Prototype Construction 1.) Tracking on Surface Finger Tracking {id, x, y, acceleration,area} Object Tracking {id, x, y, angle, acceleration} 2.) Hovering over Surface Hover Hand { range of grayscale to white } Hover Object { grayscale, id, x, y, angle, accel.}

6. Prototype Construction 3.) Object Grasping Object Grasping {object_id }

10. Conclusion and Future Work from a 19” to a 37” monitor