Information Technology Reference
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Figure 7.2
uTable tabletop system.
uTable. Infrared light bulbs are set to extend the laser pen input to be finger
touch sensitive as infrared light can be reflected from the surface when a
finger touches on the tabletop. The photo taken by the infrared camera is
disposed to determine the location of the fingers touching on the surface.
7.4.2 JuTable
JuTable is the tabletop prototype application for sharing documents by mul-
tiple users around a table.
We tried to reduce the learning affordance to the user and achieve the
cooperative work in a natural way. To make the virtual environment similar
to the real world, some GUI elements such as buttons and tool bars are
ignored.
The JuTable supports finger gestures in three ways: single finger operation,
double finger operation, and finger trajectory operation. As shown in
Figure 7.1, each gesture is pointed to one of the three kinds of arrows
according to its operation type. The solid line represents the single finger
operation, the dotted line represents the finger trajectory operation, and the
dashed line represents the double finger operation.
Figure 7.3 shows the software interface of JuTable. Each block is a user
working area. Users operate the digital documents in their own working
area. The tiny grids in the working area is a radar map widget for users to
deliver documents to others.
7.4.2.1 Single Finger Operation
Single finger operation requires the user to put a single finger on the surface,
move the finger, and lift it up. This operation can be used to accomplish three
gestures: Select, Move, and Deliver.
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