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Laser Light Plane Multitouch Technique

In LLP, infrared light from single or multiple lasers shine just above the surface. The laser plane of light is about 1mm thick and positioned as close to the touch surface as possible. When a finger or object hits the light plane, the object lights up and  is seen by an infrared camera below the surface. An image is displayed by using a projector connected to a computer pointed towards the projection material.

llp thumb1 Laser Light Plane Multitouch Technique

Parts List

  • Clear, Flat Surface (Glass, Acrylic, Polycarbonate, Plexiglass, etc.)
  • Infrared Laser(s) – Lasers can be placed in each corner of the surface
  • Line Generating Lens – Creates a thin light plane
  • Projection Material (Rosco Grey, Vellum, Mylar, Paper, other, etc.) – For displaying an image
  • Infrared Camera/Modified Webcam

Video Examples

0 Laser Light Plane Multitouch Technique

0 Laser Light Plane Multitouch Technique

0 Laser Light Plane Multitouch Technique

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  • http://twitter.com/theresajayne Theresa Forster

    Can you provide any details of suppliers to provide the lenses needed for this technique, and also the laser led suppliers.
    Question, would a frosted panel work as the projection surface instead of trying to put a projection surface over the perspex sheet?

  • Aalay

    how does it detect multitouch ? what is the use of multi touch?Is it runs on different applications?

  • Hassan elbaseri

    Hi , its so nice work . I have question, do you use image processing algorithm and which algorithm used, i would like to inform me about other application.

    • http://sethsandler.com/blog Seth Sandler

      The software is all open source. You can find it at http://ccv.nuigroup.com