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Sensors 2016, 16(1), 19;

Optical Indoor Positioning System Based on TFT Technology

Institute for Computer Science and Control, Hungarian Academy of Science, Kende St. 13–17, 1111 Budapest, Hungary
Academic Editor: Vittorio M. N. Passaro
Received: 30 September 2015 / Revised: 30 November 2015 / Accepted: 7 December 2015 / Published: 24 December 2015
(This article belongs to the Section Physical Sensors)
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A novel indoor positioning system is presented in the paper. Similarly to the camera-based solutions, it is based on visual detection, but it conceptually differs from the classical approaches. First, the objects are marked by LEDs, and second, a special sensing unit is applied, instead of a camera, to track the motion of the markers. This sensing unit realizes a modified pinhole camera model, where the light-sensing area is fixed and consists of a small number of sensing elements (photodiodes), and it is the hole that can be moved. The markers are tracked by controlling the motion of the hole, such that the light of the LEDs always hits the photodiodes. The proposed concept has several advantages: Apart from its low computational demands, it is insensitive to the disturbing ambient light. Moreover, as every component of the system can be realized by simple and inexpensive elements, the overall cost of the system can be kept low. View Full-Text
Keywords: optical sensors; optical indoor positioning; TFT technology optical sensors; optical indoor positioning; TFT technology

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Gőzse, I. Optical Indoor Positioning System Based on TFT Technology. Sensors 2016, 16, 19.

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