Not All Gestures Are Created Equal: Gesture and Visual Feedback in Interaction Spaces.

Abstract

As multi-touch mobile computing devices and open-air gesture sensing technology become increasingly commoditized and affordable, they are also becoming more widely adopted. It became necessary to create new interaction design specifically for gesture-based interfaces to meet the growing needs of users. However, a deeper understanding of the interplay between gesture, and visual and sonic output is needed to make meaningful advances in design. This thesis addresses this crucial step in development by investigating the interrelation between gesture-based input, and visual representation and feedback, in gesture-driven creative computing. This thesis underscores the importance that not all gestures are created equal, and there are multiple factors that affect their performance. For example, a drag gesture in visual programming scenario performs differently than in a target acquisition task. The work presented here (i) examines the role of visual representation and mapping in gesture input, (ii) quantifies user performance differences in gesture input to examine the effect of multiple factors on gesture interactions, and (iii) develops tools and platforms for exploring visual representations of gestures. A range of gesture spaces and scenarios, from continuous sound control with open-air gestures to mobile visual programming with discrete gesture-driven commands, was assessed. Findings from this thesis reveals a rich space of complex interrelations between gesture input and visual feedback and representations. The contributions of this thesis also includes the development of an augmented musical keyboard with 3-D continuous gesture input and projected visualization, as well as a touch-driven visual programming environment for interactively constructing dynamic interfaces. These designs were evaluated by a series of user studies in which gesture-to-sound mapping was found to have a significant affect on user performance, along with other factors such as the selection of visual representation and device size. A number of counter-intuitive findings point to the potentially complex interactions between factors such as device size, task and scenarios, which exposes the need for further research. For example, the size of the device was found to have contradictory effects in two different scenarios. Furthermore, this work presents a multi-touch gestural environment to support the prototyping of gesture interactions.PhDComputer Science and EngineeringUniversity of Michigan, Horace H. Rackham School of Graduate Studieshttp://deepblue.lib.umich.edu/bitstream/2027.42/113456/1/yangqi_1.pd