CREU Project Blog


Considering to use new Multitouch Technology by NYU Researcher
October 31, 2007, 2:38 pm
Filed under: Uncategorized

We met with professor Anind yesterday and we discussed about the problems with the LED sensing solution.  We are now considering a new possibility of construction a new device using a novel Multi-Touch technology developed by Jeff Han at NYU.  There seems to be a fair amount of documentations on how to constructed a multi-touch table online.   The theory of operation of the technology is as following.   IR light is shone into a plastic surface such that the IR light reflect internally inside the plastic.  When the reflection is disturbed by for example the touch of a finger the light will scatter and the camera placed underneath the plastic will sense blobs of IR light.  We can track the movement on the plastic by tracking the blobs of light sensed by the camera.  A picture of the setup described in the paper is shown below

    multitouch

However for the purpose of the project, we are going to make some slight change to this setup.  Our initial goal of the project is to build a 3D input device, that would allow easier manipulation of 3D models on the computer.  We are interested in tracking finger movements on a sphere using this technology.   We propose to construct a spherical device that is composed of two semi-spherical plastic surfaces.  We want to shine IR light into the two semi-spherical surface and track the finger movements on the sphere using two cameras facing back to back.

Reference:Jefferson Y. Han, Low-Cost Multi-Touch Sensing through Frustrated Total Internal Reflection 

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