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Diffuser material

There is a number of reasons why we need a diffuser for the multi-touch table surface:

-Diffuse the light evenly on the surface
-prevent hotspots
-prevent users from seeing inside the table
-it acts as a screen to view the projection

In a Rear Diffused Illumination setup (our system), a diffuser is placed under the touch surface, IR light is projected out through the touch surface and when it hits your finger, is reflected back to the camera. The camera sees the diffused light off your finger as being brighter and thus makes a blob out of it.

Common materials used include Vellum, Mylar, Lee Filters and tracing paper.
We have decided to try tracing paper for the prototype.

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