Diffused Illumination (DI)

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Diffused Illumination (DI) comes in two main forms. Front Diffused Illumination and Rear Diffused Illumination. Both techniques use the same basic principles.

Contents

Rear DI

Infrared light is shined at the screen from below the touch surface. A diffuser is placed on top or on bottom of the touch surface. When an object touches the surface it reflects more light than the diffuser or objects in the background; the extra light is sensed by a camera. Depending on the diffuser, this method can also detect hover and objects placed on the surface.

Image:rearditouch.jpg

Image:reardigraphic.jpg

Rear DI Parts List

  • Clear sturdy surface (Glass, Acrylic, Polycarbonate, Plexiglas, etc.)
  • Infrared Illuminator (Infrared LEDs, Infrared Illuminator, etc.)
  • Diffuser/Projection Surface (Vellum, Mylar, Lee Filter, other, etc.) *Note: The Diffuser/Projection Surface must let some light through.
  • Infrared Camera/Modified Webcam

Front DI

Infrared light (often from the ambient surroundings) is shined at the screen from above the touch surface. A diffuser is placed on top or on bottom of the touch surface. When an object touches the surface, a shadow is created in the position of the object. The camera senses this shadow.

Image:frontdigraphic.jpg

Front DI Parts List

  • Clear sturdy surface (Glass, Acrylic, Polycarbonate, Plexiglas, etc.)
  • Diffuser/Projection Surface (Vellum, Mylar, Lee Filter, other, etc.) *Note: The Diffuser/Projection Surface must let some light through.
  • Infrared Camera/Modified Webcam

Optional

  • Infrared Illuminator (Infrared LEDs, Infrared Illuminator, etc.)


See Diffused Illumination Plans

See Multitouch Technologies for a listing of various technologies and discussions of multi-touch theoretical discussions.

See also The CityWall Page