Inhalt des Dokuments
Markerless Identification of Interactive Devices on Multi Touch Surfaces - Stefan Dippl
- Illustration
[1]
- © Copyright??
This thesis focuses on recognition of and
interaction with markerless objects which may function as tools for
overview+detail or focus+context applications as described by Andy
Cockburn et al. [Cockburn et al.2008]. Markers usually ease the
recognition of objects but require special preparation of each object.
For applications exposed to public access this is an unwelcome
limitation.
The general idea behind is comparable to existing
multitouch projects [2] in this group but in contrast multiple
self-sustaining devices are used that are in no other way but a
wireless network connection attached to the computer running the
actual application. For a failsafe and unique identification of those
markerless devices it is necessary for the touch table to actually
"see" the devices placed on its surface.
For this
purpose a technique called "diffiuse illumination" (DI) is
used.
Each device runs a client application which logs in to an
application server via a Wifi connection. The application server is
providing the device with a unique id and determining its position by
evaluating data from the touch table while combining it with the data
retrieved from the device's sensors. This information may be data from
gyrometers or built-in cameras. For this thesis iPhones/iPod Touches
are
used. The application running on the server decides whether
to send plain image data as an overlay to the touch table's context or
explanatory data like text+images in shape of HTML in order to enhance
the user experience. Since multiple devices can be placed on the touch
table, each device can serve a different purpose.
Imagine a
route planning software displaying the calculated route on the touch
table. By placing the handheld device on the table and moving it
nearby the visual representation of the route, detailed navigation
instructions are displayed on the device and can be stored to the
device's memory. Additionally, contacts out of the device's address
book close to the handheld's geo position appear on the map. Just to
name a few of endless possibilities.
Cockburn, A., Karlson,
A., and Bederson, B. B. 2008. A review of overview+detail, zooming,
and focus+context interfaces. ACM Comput. Surv..
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ch/Theses/Dippl/abstract_illustration.pdf
che_informatik_und_mikroelektronik/cg_archiv/menue/rese
arch/projekte/multitouch/parameter/de/font1/minhilfe/
rch/Theses/Dippl/Thesis_Stefan_Dippl.pdf