Table of Contents
International Journal of Vehicular Technology
Volume 2012, Article ID 945365, 8 pages
Research Article

A Pedestrian Navigation System Using Cellular Phone Video-Conferencing Functions

1Shizuoka University, Hamamatsu 432-8561, Japan
2Toyohashi University of Technology, Toyohashi 441-8580, Japan

Received 24 July 2012; Accepted 19 November 2012

Academic Editor: Martin Reisslein

Copyright © 2012 Akihiko Sugiura and Takuya Shoji. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A user’s position-specific field has been developed using the Global Positioning System (GPS) technology. To determine the position using cellular phones, a device was developed, in which a pedestrian navigation unit carries the GPS. However, GPS cannot specify a position in a subterranean environment or indoors, which is beyond the reach of transmitted signals. In addition, the position-specification precision of GPS, that is, its resolution, is on the order of several meters, which is deemed insufficient for pedestrians. In this study, we proposed and evaluated a technique for locating a user’s 3D position by setting up a marker in the navigation space detected in the image of a cellular phone. By experiment, we verified the effectiveness and accuracy of the proposed method. Additionally, we improved the positional precision because we measured the position distance using numerous markers.