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Object recognition in a multitouch environment by combining Diffuse Illumination and Frustrated Total Internal Reflection - Björn Breitmeyer
[1]
- © Björn Breitmeyer
Multitouch has become popular in the last years,
as the production of such systems
has become a lot cheaper
through optical techniques. All of these techniques
rely on
invisible light (mostly infrared) reflections imaged by a camera. One
of the more popular techniques is based on the Frustrated Total
Internal Reflection (FTIR) effect, it relies on the change of the
refraction angle issued through pressure on the display. Another
technique is based on Diffuse Illumination (DI) and relies on direct
reflections. DI allows us to track and recognize passive markers made
of reflective materials. Those can be mounted on any object of the
appropriate size. To distinguish markers from each other they can
contain unique patterns to uniquely identify the marker and hence the
object, such markers are called fiducials. Since our tracking software
takes reference frames to remove ambient light, we can easily detect
active markers as the they are the only source of light. Through
different geometric forms of active markers an object can be
identified. Such a geometric form can also originate through pressure
of an object in an FTIR setup. The main goal is to combine these
methods to create an object recognition that is solid
and fast
enough to provide a smooth detection.To achieve this goal the minimum
recognizable size of a fiducial has to be detected. The Question is
what forms are best for fast and error prone fiducial recognition, a
fast algorithm for the fiducial detection and how can a developer
combine these techniques in order to get additional information? For
example using an FTIR pressure pattern(or an active marker pattern)
for detection of a display, like Stefan Elstner [2] did in his Diploma
Thesis and have more than one display which can be distinguished by
their fiducial.
Our table has to be refactored to support a fast
switching between DI, FTIR and reference frames. After that the
question is when do we need which frame?
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