Multi-touch gestures are the latest and greatest way to interact with your computer.  However, commercial systems are not widely available and are expensive.  Fortunately, you can do it yourself better and for less cost.

Principle components (Click links for product info):
$35 PS3 Eye Camera (Recommended but any decent webcam will work)
$20 IR bandpass filter
$200 5-meter dimmable IR LED Strip
$1000 Any recent/decent computer (PC/MAC)
$1000 Any projector >2000 lumens (NEC NP410W)
$40 Front surface mirror
$80 Abrasion resistant acrylic sheet (23" x 35" x 0.236")
$130 Rear projection acrylic sheet (23" x 35" x 0.118")
$145 EndLighten acrylic sheet (23" x 35" x 0.394")
Total: ~$2500

Software (Click links for downloads):
$free CCV (Used to turn images into blobs)
$free CL-Eye Platform Driver (For PS3 Eye camera)
$free Multi-Touch Vista (Optional Multi-Touch TUIO driver for Windows integration)
$? Windows 7 (Recommended)

Written by Justin Klaassen, Duke University B.S.E. 2012
Sponsored by the Duke Library

Step 1: What is a Multi-Touch surface?

 A Multi-Touch surface is essentially a giant touch screen that can process multiple touches at once.  And in our case, a virtually unlimited amount of touches.  By allowing multiple touches, gestures can be performed on surface.  These gestures are typically simple things like pinching and pulling on an image to zoom in and out.  By supporting gestures like these interfacing with a computer becomes much more intuitive and fun.  In a public place, a Multi-Touch surface can be a real attention grabber.

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