Ergonomic Design Development and Evaluation of Stability and Comfort for the Visual Experience Database Headset
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Authors
Shankar, Bharath
Issue Date
2021
Type
Thesis
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Abstract
Head-mounted devices allow for recording of eye movements, head movements, and scene video outside of the traditional laboratory setting. A key challenge for recording comprehensive first-person stimuli and behavior outside the lab is the form factor of the head-mounted assembly. It should be stably mounted on the head to minimize slippage and maximize accuracy of the data; it should be as unobtrusive and comfortable as possible to allow for natural behaviors and enable longer duration recordings; and it should be able to fit a diverse user population. Here, we explain the design iterations of the Visual Experience Database headset, an assembly consisting of the Pupil Core eye tracker, the Intel RealSense T265 tracking camera, and the FLIR Chameleon 3 world camera, and evaluate two of these iterations (rigid and elastic headsets) by quantifying their stability and comfort. To quantify stability, we asked participants to wear each of the headsets while walking at three speeds (slow, medium, fast) on a treadmill while maintaining fixation on a world-fixed point. Stability was quantified in terms of both drift (i.e overall change in measured fixation position) and jitter (i.e. the spread of high-frequency oscillation of the measured fixation). Greater drift was observed with the rigid headset, and greater jitter was observed with the elastic headset. Comfort was assessed using surveys and results indicated that the elastic headset was generally more comfortable and provided a better fit. We conclude with a discussion of functional trade-offs that bear on design and use of head-mounted sensor systems.
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Creative Commons Attribution-ShareAlike 4.0 United States