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Abstract: Cost effective tangibles using fiducials for infrared multi-touch frames
Thomas Becker und Jens Herder. Cost effective tangibles using fiducials for infrared multi-touch frames, 15th International Conference on Human and Computer, Hamamatsu/Aizu-Wakamatsu/Duesseldorf, February, 2013.
The late immersion of multi-touch sensitive displays enables the use of tangibles on
multi-touch screens. There a several wide spread and/or sophisticated solutions to
fulfill this need but they seem to have some flaws. One popular system at the time
of writing is an overlay frame that can be placed on a normal display with the
corresponding size. The frame creates a grid with infrared light emitting diodes.
The disruption of this grid can be detected and messages with the positions are sent
via usb to a connected computer. This system is quite robust in matters of ambient
light insensitivity and also fast to calibrate. Unfortunately it is not created with
the recognition of tangibles in mind and printed patterns can not be resolved. This
article summarizes an attempt to create fiducials that are recognized by an
infrared multi-touch frame as fingers. Those false fingers are checked by a software
for known patterns. Once a known pattern (= fiducial) has been recognized its
position and orientation are send with the finger positions towards the interactive
software. The usability is tested with an example application where tangibles and
finger touches are used in combination.
Keywords:
low cost multi-touch infrared overlay frame, fiducial tangible recognition
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