December 2006 - tr-announce - lists.rwth-aachen.de

2006-17: Scrolling Through Time: Improving Interfaces for Searching and Navigating Continuous Audio Timelines
by Peter Schneider-Kamp 20 Dec '06

20 Dec '06

The following technical report is available from http://aib.informatik.rwth-aachen.de: Scrolling Through Time: Improving Interfaces for Searching and Navigating Continuous Audio Timelines Eric Lee, Henning Kiel, Jan Borchers AIB 2006-17 Existing work has produced a variety of techniques to improve interfaces for navigating an audio timeline. These interfaces typically map user input to either a change in play rate, or playback position. Audio feedback while scrolling at arbitrary rates can be provided by: skipping immediately to the new position in the audio; resampling the audio, which introduces pitch-shifts; timestretching the audio to preserve the pitch; or not at all. We conducted a series of user studies to examine the effects of input and feedback type on targeting performance. Position control was found to be, on average, 15-19% faster than rate control when searching for targets 90 to 100 seconds away in the audio timeline. Time-stretching was found to be the best choice in most scenarios, but skipping, and, for specific user groups, resampling, should be used for precise targeting tasks where the audio play rate falls below one-tenth nominal speed.

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2006-16: Selexels: a Conceptual Framework for Pointing Devices with Low Expressiveness
by Peter Schneider-Kamp 13 Dec '06

13 Dec '06

The following technical report is available from http://aib.informatik.rwth-aachen.de: Selexels: a Conceptual Framework for Pointing Devices with Low Expressiveness Rafael Ballagas, Jan Borchers AIB 2006-16 As human-computer interaction extends beyond the desktop, the need emerges for new input devices and interaction techniques. However, many novel interaction techniques must be prototyped in a proof-of-concept form, and can suffer from low expressiveness: their ability to convey the intended meaning is limited. We present a new conceptual framework based on selexels that allows application designers to match the expressiveness of the user interface to that of the input device. This allows the user interface to provide a fluid user experience despite the limitations of the input device. A user study validates the framework, shows that selexel-based pointing tasks can be modeled using Fitts' Law, and provides insights for structuring evaluations of prototype input devices.

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2006-15: Utilizing optical sensors from mice for new input devices
by Peter Schneider-Kamp 05 Dec '06

05 Dec '06

The following technical report is available from http://aib.informatik.rwth-aachen.de: Utilizing optical sensors from mice for new input devices Sebastian Ullrich, Jakob T. Valvoda, Torsten Kuhlen AIB 2006-15 This paper introduces approaches towards the development of intuitive input devices built with optical sensors from mice. The two main ideas are spatial reconfiguration of the sensor and advanced interpretation of the sensor data. We present new concepts for various input devices that are easy to rebuild. A prototype for kinematics manipulation of virtual characters has been constructed and algorithms for data interpretation have been implemented and evaluated.

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