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Paper Abstract and Keywords
Presentation 2007-09-19 15:15
Positioning Method Using Road Traffic Sign to Correct GPS Error for Pedestrian Navigation
Hidetaka Ohira, Nozomu Togawa, Masao Yanagisawa, Tatsuo Ohtsuki (Waseda Univ) ITS2007-28
Abstract (in Japanese) (See Japanese page) 
(in English) GPS has a significant error caused by multipath, poor satellite reception and so on.
We propose a positioning method that can correct GPS error for pedestrian navigation.
Our system is composed of a cellular phone with camera, GPS and the map server that are all existing infrastructures and devices.
A user takes a picture including a traffic sign by using his cellular phon camera and send it to the map server.
The map server identifies the road traffic sign from the picture taken by the cellular phone.
Because the user is in which he can see the sign, the map server corrects GPS error using position of the sign and identifies his position.
One of the most important processes of this system is identification of the road traffic sign.
Speed-up and high accuracy are needed for this process.
We propose speed-up and high accuracy technique for identification of the road traffic sign.
This technique is based on the feature that the user takes a picture of the sign to the center of the image.
When the map server receives a sign picture, the map server identifies the sign by color recognition,
shape recognition using Hough transform and symbol recognition using template matching.
Proposed system reduces communication data by changing the resolution of the image to low
so that the time from the sending the image to receiving result is kept within 3 seconds.
In recognition of the color of the sign, the high accuracy is achieved by putting high weight on a pixel near the center of image.
In recognition of the shape of sign, the hough transform is sped up by using direction of edges and
the feature that a rounded sign is at the center of image.
In template matching, speed-up is achieved by narrowing the candidate according to the color and the shape of the sign.
Keyword (in Japanese) (See Japanese page) 
(in English) pedestrian navigation / GPS / positioning / image recognition / hough transform / / /  
Reference Info. IEICE Tech. Rep., vol. 107, no. 216, ITS2007-28, pp. 27-32, Sept. 2007.
Paper # ITS2007-28 
Date of Issue 2007-09-12 (ITS) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF ITS2007-28

Conference Information
Committee ITS IPSJ-ITS IEE-ITS  
Conference Date 2007-09-18 - 2007-09-19 
Place (in Japanese) (See Japanese page) 
Place (in English) Institute of Industrial Science, University of Tokyo 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Measurement Techniques for Vehicular Traffic, etc. 
Paper Information
Registration To ITS 
Conference Code 2007-09-ITS-IPSJ-ITS-IEE-ITS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Positioning Method Using Road Traffic Sign to Correct GPS Error for Pedestrian Navigation 
Sub Title (in English)  
Keyword(1) pedestrian navigation  
Keyword(2) GPS  
Keyword(3) positioning  
Keyword(4) image recognition  
Keyword(5) hough transform  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Hidetaka Ohira  
1st Author's Affiliation Waseda University (Waseda Univ)
2nd Author's Name Nozomu Togawa  
2nd Author's Affiliation Waseda University (Waseda Univ)
3rd Author's Name Masao Yanagisawa  
3rd Author's Affiliation Waseda University (Waseda Univ)
4th Author's Name Tatsuo Ohtsuki  
4th Author's Affiliation Waseda University (Waseda Univ)
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Speaker Author-1 
Date Time 2007-09-19 15:15:00 
Presentation Time 30 minutes 
Registration for ITS 
Paper # ITS2007-28 
Volume (vol) vol.107 
Number (no) no.216 
Page pp.27-32 
#Pages 6 
Date of Issue 2007-09-12 (ITS) 

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