Multitouch

Creator: Strages Status: Researching Born On: 00:10, 13 June 2010 (CDT) Last Updated: 17:23, 13 June 2010 (CDT)

Overview

This is a research page for all things multitouch.

Methods

Diffused Side Illumination (DSI)

DSI uses a special acrylic to distribute the IR evenly across the surface. Basically use your standard FTIR setup with an LED Frame (no compliant silicone surface needed), and just switch to a special acrylic. This acrylic uses small particles that are inside the material, acting like thousands of small mirrors. When you shine IR light into the edges of this material, the light gets redirected and spread to the surface of the acrylic. The effect is similar to DI, but with even illumination, no hotspots, and same setup process as FTIR.

DSI Parts List:

• EndLighten Acrylic
• LEDs
• Projection Surface (tracing paper, lee filter, geriets optitrans , etc);
• Infrared Camera/Modified Webcam

Pros:

• No compliant surface (silicone)
• Can easily switch back and forth between DI (DSI) and FTIR
• Can detect objects, hovering, and fiducials
• Is pressure sensitive
• No hotspots
• even finger/object illumination throughout the surface

Cons:

• Endlighten Acrylic costs more than regular acrylic (but the some of the cost can be made up since no IR illuminators are needed)
• Blobs have lower contrast (harder to pick up by software) than FTIR and LLP

Software

• PyMT
• Community Core Vision
• MT4J

Hardware

• Sony PS3Eye
  • multicamera drivers
• IR LED strips
• IR lasers