HeadZoom: Hands-Free Zooming and Panning for 2D Image Navigation Using Head Motion
Kaining Zhang, Catarina Moreira, Pedro Belchior, Gun Lee, Mark Billinghurst, Joaquim Jorge

TL;DR
HeadZoom is a novel hands-free head motion-based technique for smooth zooming and panning in 2D visual content, improving user comfort and efficiency in tasks like map and image exploration.
Contribution
It introduces a new head-tracking interaction method for 2D navigation that reduces physical effort and enhances usability in VR and accessible systems.
Findings
Parallel Zoom reduces head movement compared to other techniques.
Users experience lower perceived exertion with Parallel Zoom.
HeadZoom enables effective hands-free 2D navigation in various applications.
Abstract
We introduce \textit{HeadZoom}, a hands-free interaction technique for navigating two-dimensional visual content using head movements. HeadZoom enables fluid zooming and panning using only real-time head tracking. It supports natural control in applications such as map exploration, radiograph inspection, and image browsing, where physical interaction is limited. We evaluated HeadZoom in a within-subjects study comparing three interaction techniques-Static, Tilt Zoom, and Parallel Zoom-across spatial, error, and subjective metrics. Parallel Zoom significantly reduced total head movement compared to Static and Tilt modes. Users reported significantly lower perceived exertion for Parallel Zoom, confirming its suitability for prolonged or precision-based tasks. By minimizing movement demands while maintaining task effectiveness, HeadZoom advances the design of head-based 2D interaction in…
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Taxonomy
TopicsGaze Tracking and Assistive Technology · Augmented Reality Applications · Interactive and Immersive Displays
