Android-Based Visual Tag Detection for Visually Impaired Users: System Design and Testing

Android-Based Visual Tag Detection for Visually Impaired Users: System Design and Testing

Hao Dong, Jieqi Kang, James Schafer, Aura Ganz
Copyright: © 2014 |Pages: 18
DOI: 10.4018/ijehmc.2014010104
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Abstract

In this paper the authors introduce PERCEPT-V indoor navigation for the blind system. PERCEPT-V enhances PERCEPT system by enabling visually impaired users to navigate in open indoor spaces that differ in size and lighting conditions. The authors deploy visual tags in the environment at specific landmarks and introduce a visual tag detection algorithm using a sampling probe and cascading approach. The authors provide guidelines for the visual tag size, which is a function of various environmental, and usage scenarios, which differ in lighting, dimensions of the indoor environment and angle of usage. The authors also developed a Smartphone based user interface for the visually impaired users that uses Android accessibility features.
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There have been a number of research projects that can help the visually impaired navigate in unfamiliar indoor environments (Horowitz, 2003; Noor, HIsmail & Saaid, 2009; Chumkamon, Tuvaphanthaphiphat & Keeratiwintakorn, 2008; Ki Giampaolo, 2010; Ganz, Gandhi, Wilson & Mullett, 2010; Darvishy, Hutter, Früh, Horvath & Berner, 2008; Coughlan & Manduchi, 2009; Ivanov, 2010; Bostelman, Russo, Albus, Hong & Madhavan, 2006; Fernandes, Costa, Filipe, Hadjileontiadis & Barroso, 2010; Manduchi, Kurniawan & Bagherinia, 2010; Brilhault, Kammoun, Gutierrez, Truillet & Jouffrais, 2011). Most of these systems design and use new devices for their users, which mean extra cost. One of the prominent projects that underwent user trials with 24 visually impaired subjects is the PERCEPT project (Ganz et al., 2011) funded by the National Institutes of Health/National Eye Institute. PERCEPT uses passive RFID tags (R-tags) deployed on different landmarks in the environment. PERCEPT user interacts with the environment using a glove and a Smartphone. Upon touching the R-tags using the glove, PERCEPT server through the Smartphone provides navigation instructions to the visually impaired users. More details on the system can be found in Ganz et al. (2011).

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