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Nektarios Paisios

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Publications by Nektarios Paisios (bibliography)

2011

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Paisios, Nektarios, Rubinsteyn, Alex, Vyas, Vrutti and Subramanian, Lakshminarayanan (2011): Recognizing currency bills using a mobile phone: an assistive aid for the visually impaired. In: Proceedings of the 2011 ACM Symposium on User Interface Software and Technology 2011. pp. 19-20.

“Despite the rapidly increasing use of credit cards and other electronic forms of payment, cash is still widely used for everyday transactions due to its convenience, perceived security and anonymity. However, the visually impaired might have a hard time telling each paper bill apart, since, for example, all dollar bills have the exact same size and, in general, currency bills around the world are not distinguishable by any tactile markings. We propose the use of a broadly available tool, the camera of a smart-phone, and an adaptation of the SIFT algorithm to recognize partial and even distorted images of paper bills. Our algorithm improves memory efficiency and the speed of SIFT key-point classification by using a k-means clustering approach. Our results show that our system can be used in real-world scenarios to recognize unknown bills with a high accuracy.”

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Paisios, Nektarios, Rubinsteyn, Alex, Subramanian, Lakshminarayanan, Tierney, Matt and Vyas, Vrutti (2011): Tracking indoor location and motion for navigational assistance. In: Proceedings of the 2011 ACM Symposium on User Interface Software and Technology 2011. pp. 83-84.

“Visually impaired people have a harder time remembering their way around complex unfamiliar buildings, whilst obtaining the help of a sighted guide is not always possible or desirable. By sensing the users location and motion, however, mobile phone software can provide navigational assistance in such situations, obviating the need of human guides. We present a simple to operate and highly usable mobile navigational guide that uses Wi-Fi and accelerometer sensors to help the user repeat paths that were already walked once.”

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