Inhaltszusammenfassung

Large, high-resolution displays (LHRD) provide the advantageous capability of being able to visualize a large amount of very detailed information, but also introduce new challenges for human-computer interaction. Limited human visual acuity and field of view force users to physically move around in front of these displays either to perceive object details or to obtain an overview. Conventional input devices such as mouse and keyboard, however, restrict users' mobility by requiring a stable su...Large, high-resolution displays (LHRD) provide the advantageous capability of being able to visualize a large amount of very detailed information, but also introduce new challenges for human-computer interaction. Limited human visual acuity and field of view force users to physically move around in front of these displays either to perceive object details or to obtain an overview. Conventional input devices such as mouse and keyboard, however, restrict users' mobility by requiring a stable surface on which to operate and thus impede fluid interaction and collaborative work settings. In order to support the investigation of alternative input devices or the design of new ones, we present a design space classification which enables the methodical exploration and evaluation of input devices in general. Based on this theoretical groundwork we introduce the Laser Pointer Interaction, which is especially designed to satisfy the demands of users interacting with LHRDs with respect to mobility, accuracy, interaction speed, and scalability. In contrast to the indirect input mode of the mouse, our interactive laser pointer supports a more natural pointing behaviour based on absolute pointing. We describe the iteratively developed design variants of the hardware input device as well as the software toolkit which enables distributed camera-based tracking of the reflection caused by the infrared laser pointer. In order to assess the general feasibility of the laser pointer interaction for LHRDs, an experiment on the basis of the ISO standard 9241-9 was conducted comparing the interactive laser pointer with the current standard input device, the mouse. The results revealed that the laser pointer‘s performance in terms of selection speed and precision was close to that of the mouse (around 89 % at a distance of 3 m), although the laser pointer was handled freely in mid-air without a stabilizing rest. Since natural hand tremor and human motor precision limit further improvement of pointing performance, in particular when interacting from distant positions, we investigate precision enhancing interaction techniques. We introduce Adaptive Pointing, a novel interaction technique which improves pointing performance for absolute input devices by implicitly adapting the Control-Display gain to the current user’s needs without violating users’ mental model of absolute-device operation. In order to evaluate the effect of the Adaptive Pointing technique on interaction performance, we conducted a controlled experiment with 24 participants comparing Adaptive Pointing with pure absolute pointing using the interactive laser pointer. The results showed that Adaptive Pointing results in a significant improvement compared with absolute pointing in terms of movement time (19%), error rate (63%), and user satisfaction. As we experienced in our own research, the development of new input devices and interaction techniques is very challenging, since it is less supported by common development environments and requires very in-depth and broad knowledge of diverse fields such as programming, signal processing, network protocols, hardware prototyping, and electronics. We introduce the Squidy Interaction Library, which eases the design and evaluation of new interaction modalities by unifying relevant frameworks and toolkits in a common library. Squidy provides a central design environment based on high-level visual data flow programming combined with zoomable user interface concepts. The user interface offers a simple visual language and a collection of ready-to-use devices, filters, and interaction techniques which facilitate rapid prototyping and fast iterations. The concept of semantic zooming nevertheless enables access to more advanced functionality on demand. Thus, users are able to adjust the complexity of the user interface to their current needs and knowledge. The Squidy Interaction Library has been iteratively improved alongside the research of this thesis and though its use in various scientific, artistic, and commercial projects. It is free software and is published under the GNU Lesser General Public License.» weiterlesen» einklappen

Autoren

Klassifikation

DFG Fachgebiet:
Informatik

DDC Sachgruppe:
Informatik