Multi-touch Table Progress

I’ve been able to get hold of an old frame made of perforated metal plates. I reassembled the parts in a way that I’ve got a frame for my multi-touch display. Currently it has the table form factor but it can easily be readjusted to be a console or even a panel.

The multi-touch display itself is made of an acrylic glass plate in which infrared light is being emitted from the sides by 24 infrared leds. Thus the light is being endlessly reflected internally in the plate. If a finger is touching the plate the optical effect of light frustration will take place that effects light to be emitted vertically on the frustration place (the point where your finger tip is touching the display). Onto the back of the display where a back projection foil is mounted an image is projected by a video beamer (a Panasonic PT-AX200E). The display is being scanned by a webcam with a removed infrared light filter (a Philips SPC900NC with this lens). A Mac Mini is producing the image that is projected by the beamer onto the display and is doing touch calculations with the help of Touchlib.

Here are some pictures from the current state of it: