Information Technology Reference
In-Depth Information
7.1 Introduction
Tabletop systems augment information display and direct manipulation
onto conventional table functions. The tabletop surface can create a virtual
environment for users based on computer vision and sensing techniques;
tabletop systems can provide users with a more natural way (such as touching
and writing with a pen) to interact with the virtual environment. With the
development of technology, the tabletop system will have a wide range of
uses and be beneficial.
One of the typical application scenarios of the tabletop is sharing
documents among multiple users. Compared to sharing photographs on
relatively small tabletops, sharing document applications requires larger
tabletop surfaces that makes some techniques no longer available. Though
some research [9-11] has been done on sharing photographs and other
application scenarios, the solution cannot be used to solve the problem
of sharing digital documents among multiple users on the large tabletop.
Though many interactive techniques on a tabletop have been proposed [4-8],
no one has systematically designed an interface for this application.
Our goal is to give a solution to this application scenario. We explore
guidelines for the design of an interface, list what kinds of finger gestures
are required; and develop a prototype application, JuTable, to evaluate our
ideas. In our design, finger trajectory operation techniques are used for
complicated finger gestures as we find that they provide a more natural way
for users to interact with the tabletop systems. Specifically, we design a radar
map widget to facilitate delivering documents.
Section 7.2 is an overview of the related work. In Section 7.3, after analyzing
the scenario of sharing documents on a large tabletop, we propose the user
interface design guidelines and then define a set of gestures that the interface
would support under the guidelines. Section 7.4 describes the implementation
of the finger gestures and explores them in the prototype application, JuTable.
In Section 7.5, we collect the users' feedback and have a discussion on the learn-
ability, usability, and the naturalness of our interface design. Finally in Section
7.6, we summarize our work and give some suggestions on future research.
7.2 Related Works
There are many tabletop systems in the research world such as
DiamondTouch [1], SmartSkin [2], and Microsoft Surface [3]. Based on these
tabletop systems, many studies on designing freehand gestures have been
carried out, including cooperative gestures [4], multifinger and whole hand
gestural interaction techniques [5], interaction techniques for transition in
 
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