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This paper describes our experiences with developing cost-effective assistive technologies for the visually impaired, with a focus on using commercial off-the-shelf technologies as much as possible. Trinetra involves three specific technologies--the grocery shopping assistant, the currency identifier and the transportation assistant--all supported on standard mobile phones with text-to-speech, commonly used by the visually impaired.
Narasimhan et al. (Sun,) studied this question.
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