Creating Your Bubble: Personal Space On and Around Large Public Displays

We describe an empirical study that explores how users establish and use personal space around large public displays (LPDs). Our study complements field studies in this space by more fully characterizing interpersonal distances based on coupling and confirms the use of on-screen territories on vertical displays. Finally, we discuss implications for future research: limitations of proxemics and territoriality, how user range can augment existing theory, and the influence of display size on personal space

Subtle and Personal Workspace Requirements for Visual Search Tasks on Public Displays

This is the author’s version of the work. It is posted here by permission of ACM for your personal use. Not for redistribution. The definitive version was published in the Proceedings of the 2017 International Conference on Human Factors in Computing Systems on the ACM Digital Library http://dx.doi.org/10.1145/3025453.3025500We explore how users approach and define personal space on large, public displays. Our results show that users of public displays use one of two strategies for visual search tasks: minimizers create a small window and work up close to the display, and maximizers expand content to its full resolution and work at a distance. We show that these interaction styles match predicted `personal' and `subtle' interaction zones, characterize typical width and height requirements for these interactions, and show that these requirements are independent of the on-screen content's dimensions. Finally, we suggest practical guidelines for defining workspaces during personal and subtle interaction on large, public displays

Modeling User Performance on Curved Constrained Paths

International audienceIn 1997, Accot and Zhai presented seminal work analyzing the temporal cost and instantaneous speed profiles associated with movement along constrained paths. Their work posited and validated the steering law, which described the relationship between path constraint, path length and the temporal cost of path traversal using a computer input device (e.g. a mouse). In this paper, we argue that the steering law fails to correctly model constrained paths of varying, arbitrary curvature, propose a new form of the law that accommodates these curved paths, and empirically validate our model

Détection de la manualité via les capteurs d'orientation du smartphone lors de la prise en main

National audiencePeople often switch hands while holding their phones, based on task and context. Ideally, we would be able to detect which hand they are using to hold the device, and use this information to optimize the interaction. We introduce a method to use built-in orientation sensors to detect which hand is holding a smartphone prior to first interaction. Based on logs of people picking up and unlocking a smartphone in a controlled study, we show that a dynamic-time warping approach trained with user-specific examples achieves 83.6% accuracy for determining which hand is holding the phone, prior to touching the screen.En fonction de la tâche et du contexte, les utilisateurs de smartphone ont pour habitude de changer de main pour tenir leur appareil. Idéalement, nous souhaiterions connaître la main utilisée afin d'optimiser l'interaction. A cet effet, nous introduisons une méthode utilisant les capteurs d'orientation intégrés afin de déterminer la main tenant le smartphone avant toute interaction. Nous montrons, par l'analyse des données de participants prenant et déverrouillant leurs smartphones durant une expérience contrôlée, qu'une approche utilisant l'algorithme Dynamic-Time Warping permet d'obtenir une précision de 83.6% afin de détecter la main utilisée

Effect of Motion-Gesture Recognizer Error Pattern on User Workload and Behavior

International audienceBi-level thresholding is a motion gesture recognition technique that mediates between false positives, and false negatives by using two threshold levels: a tighter threshold that limits false positives and recognition errors, and a looser threshold that prevents repeated errors (false negatives) by analyzing movements in sequence. In this paper, we examine the effects of bi-level thresholding on the workload and acceptance of end-users. Using a wizard-of-Oz recognizer, we hold recognition rates constant and adjust for fixed versus bi-level thresholding. Given identical recognition rates, we show that systems using bi-level thresholding result in significant lower workload scores on the NASA-TLX and accelerometer variance. Overall , these results argue for the viability of bi-level thresholding as an effective technique for balancing between false positives, recognition errors and false negatives

The effect of interior bezel presence and width on magnitude judgement

© The Authors, 2014. This is the author's version of the work. It is posted here by permission for your personal use. Not for redistribution. First published in print by Canadian Human-Computer Communications Society, and also in electronic form by ACM, Wallace, J. R., Vogel, D., & Lank, E. (2014). The effect of interior bezel presence and width on magnitude judgement. In Proceedings of Graphics Interface 2014 (pp. 175–182). Montreal, Quebec, Canada: Canadian Information Processing Society.Large displays are often constructed by tiling multiple small displays, creating visual discontinuities from inner bezels that may affect human perception of data. Our work investigates how bezels impact magnitude judgement, a fundamental aspect of perception. Two studies are described which control for bezel presence, bezel width, and user-to-display distance. Our findings form three implications for the design of tiled displays. Bezels wider than 0.5cm introduce a 4-7% increase in judgement error from a distance, which we simplify to a 5% rule of thumb when assessing display hardware. Length judgements made at arm's length are most affected by wider bezels, and are an important use case to consider. At arm's length, bezel compensation techniques provide a limited benefit in terms of judgement accuracy. Copyright held by authors