Prof. Charalambos Poullis Profile

Prof. Charalambos Poullis

at Concordia Univ

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Proceedings Article | 16 March 2023 Poster + Paper

Analysis of error rate in hierarchical menu selection in immersive augmented reality

Majid Pourmemar, Charalambos Poullis

Proceedings Volume 12449, 124491L (2023) https://doi.org/10.1117/12.2648315

KEYWORDS: Augmented reality, Error analysis, Mathematical modeling

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The emergence of new immersive AR/VR headsets recently resulted in major improvements in hand-gesturebased user interfaces. Devices such as MS HoloLens II and Oculus Quest II support hand-gestures. Although using hand-gestures increases the sense of presence and ease of natural interactions, it has been shown that hand-gestures require extensive physical activity. Furthermore, it has been shown that the error rate in hierarchical menu selection is much higher when using hand-gestures than when using a desktop environment or the controllers. Therefore, assessing the difficulty of a hierarchical menu design when using hand-gestures and gaze for menu selection will enable UI designers to develop more effective user interfaces. In this work, we provide a validated index for estimating the hierarchical menu selection error using hand-gesture and head-gaze as input modalities. The index is informed by cognitive WAIS data gathered from participants, which measures subjective cognitive performance. The proposed index is the result of a user study that includes hundreds of hierarchical menu selections using MS HoloLens, and is validated against the data of a group of different participants. The results demonstrate that the index can successfully capture the trend of the users’ errors in selecting the hierarchical menu items in immersive environments.

Proceedings Article | 19 February 2020 Paper

Portal to knowledge: a virtual library using marker-less augmented reality system for mobile devices

Yashas Joshi, Charalambos Poullis

Proceedings Volume 11310, 113101C (2020) https://doi.org/10.1117/12.2554571

KEYWORDS: Augmented reality, Virtual reality, Autoregressive models, Mobile devices, Head-mounted displays, Visualization, 3D image processing, Detection and tracking algorithms, 3D modeling, Computing systems

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Since exceedingly efficient hand-held devices became readily available to the world, while not being a relatively recent topic, Augmented Reality (AR) has rapidly become one of the most prominent research subjects. These robust devices could compute copious amounts of data in a mere blink of an eye. Making it feasible to overlap computer generated, interactive, graphics over the real world images in real-time to enhance the comprehensive immersive experience of the user. In this paper, we present a novel mobile application which allows the users to explore and interact with a virtual library in their physical space using marker-less AR. Digital versions of books are represented by 3D book objects on bookcases similar to an actual library. Using an in-app gaze controller, the user’s gaze is tracked and mapped into the virtual library. This allows the users to select (via gaze) a digital version of any book and download it for their perusal. To complement the immersive user experience, a continuity is maintained using the concept of Portals while making any transition from AR to immersive VR or vice-versa, corresponding to transitioning from a "physical" to a virtual space. The use of portals makes these transitions simple and seamless for the user. The presented application was implemented using Google AR Core SDK and Unity 3D, and will serve as a handy tool to spawn a virtual library anytime and anywhere, giving the user an imminent mixed sense of being in an actual traditional library while having the digital version of any book on the go.

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