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Mobile accessibility: natural user interface for motion-impaired users

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Abstract

We designed a natural user interface to access mobile devices for motion-impaired people who cannot use the standard multi-touch input system to work with tablets and smartphones. We detect the head motion of the user by means of the frontal camera and use its position to interact with the mobile device. The purpose of this work is to evaluate the performance of the system. We conducted two laboratory studies with 12 participants without disabilities and a field study with four participants with multiple sclerosis (MS). The first laboratory study was done to test the robustness and to count with a base to compare the results of the evaluation done with the participants with MS. Once observed the results of the participants with disabilities, we conducted a new laboratory study with participants without disabilities simulating the limitations of the users with MS to tune the system. All participants completed a set of defined tasks: pointing and pointing-selecting. We logged use and conducted questionnaires post-experiment. Our results showed positive outcomes using the system as an input device, although apps should follow a set of recommendations on the size of the targets and their position to facilitate the interaction with mobile devices for motion-impaired users. The work demonstrates the interface’s possibilities for mobile accessibility for motion-impaired users who need alternative access devices to interact with mobile devices.

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Notes

  1. We refer to the Apple point as px.

  2. This implies a resolution of 1024-by-768 Apple points. .

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Acknowledgements

We acknowledge the Agencia Estatal de Investigación (AEI) and the European Regional Development Funds (ERDF) for its support to the Project TIN2012-35427 (AEI/ERDF, EU), TIN2016-81143-R (AEI/FEDER, UE) and the Grand FPI BES-2013-064652 (FPI). We thank all the volunteers who participated in this study and ABDEM staff for their support.

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Authors and Affiliations

  1. Department of Mathematics and Computer Science, Universitat de les Illes Balears, Crta. Valldemossa Km 7.5, 07122, Palma, Spain

    Cristina Manresa-Yee, Maria Francesca Roig-Maimó & Javier Varona

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  1. Cristina Manresa-Yee
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  2. Maria Francesca Roig-Maimó
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  3. Javier Varona
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Correspondence to Cristina Manresa-Yee.

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Manresa-Yee, C., Roig-Maimó, M.F. & Varona, J. Mobile accessibility: natural user interface for motion-impaired users. Univ Access Inf Soc 18, 63–75 (2019). https://doi.org/10.1007/s10209-017-0583-3

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