Browsing by Author "Haller, Michael"

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    MathSketch: Designing a dynamic whiteboard for instruction contexts
    (2012) Grossauer, Christian; Perteneder, Florian; Haller, Michael; Walny, Jagoda; Brosz, John; Tang, Anthony; Carpendale, Sheelagh
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    The NiCE Discussion Room: Integrating Paper and Digital Media to Support Co-Located Group Meetings
    (ACM, 2010) Haller, Michael; Leitner, Jakob; Seifried, Thomas; Wallace, James R.; Scott, Stacey D.; Richter, Christoph; Brandl, Peter; Gokcezade, Adam; Hunter, Seth
    Current technological solutions that enable content creation and sharing during group discussion meetings are often cumbersome to use, and are commonly abandoned for traditional paper-based tools, which provide flexibility in supporting a wide range of working styles and task activities that may occur in a given meeting. Paper-based tools, however, have their own drawbacks; paper-based content is difficult to modify or replicate. We introduce a novel digital meeting room design, the NiCE Discussion Room, which integrates digital and paper tools into a cohesive system with an intuitive pen-based interface. The combination of digital and paper media provides groups with a flexible design solution that enables them to create, access, and share information and media from a variety of sources to facilitate group discussions. This paper describes the design solution, along with results from a user study conducted to evaluate the usability and utility of the system.
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    Perceptual grouping: selection assistance for digital sketching
    (ACM, 2013) Lindlbauer, David; Haller, Michael; Hancock, Mark; Scott, Stacey D.; Stuerzlinger, Wolfgang
    Modifying a digital sketch may require multiple selections before a particular editing tool can be applied. Especially on large interactive surfaces, such interactions can be fatiguing. Accordingly, we propose a method, called Suggero, to facilitate the selection process of digital ink. Suggero identifies groups of perceptually related drawing objects. These "perceptual groups" are used to suggest possible extensions in response to a person's initial selection. Two studies were conducted. First, a background study investigated participant's expectations of such a selection assistance tool. Then, an empirical study compared the effectiveness of Suggero with an existing manual technique. The results revealed that Suggero required fewer pen interactions and less pen movement, suggesting that Suggero minimizes fatigue during digital sketching.
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    Surface Ghosts: Promoting Awareness of Transferred Objects during Pick-and-Drop Transfer in Multi-Surface Environments
    (ACM, 2014) Scott, Stacey D.; Besacier, Guillaume; Tournet, Julie; Goyal, Nippun; Haller, Michael
    Rekimoto's Pick-and-Drop (P&D) transfer technique is commonly used to support multi-surface object transfer (e.g., between a shared tabletop and tablet) due to its easily understood metaphor of emulating object movement in the physical world. Current multi-surface implementations of P&D provide little to no feedback during transfer, causing confusion for the person performing the action as well as others in the environment. To address this issue, we investigated the use of virtual embodiments to improve awareness of transferred objects, in the context of a real-world group task that relied heavily on cross-device transfer. An iterative design process led to the design of Surface Ghosts virtual embodiments, which take the form of semi-transparent 'ghosts' of the transferred objects displayed under the "owner's" hand on the tabletop during transfer. A user study that compared two Surface Ghosts designs-varied by how explicitly the "owner" was indicated-showed that both designs improved awareness of transferred objects when compared to a no-feedback control condition, especially for tabletop-to-tablet transfers.