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Paper Abstract and Keywords
Presentation 2008-07-28 14:00
Recognition Rate Investigation of Various Photography Conditions for Pedestrian Positioning Using Road Traffic Signs
Tomoyuki Kojima, Nozomu Togawa, Masao Yanagisawa, Tatsuo Ohtsuki (Waseda Univ.) ITS2008-14
Abstract (in Japanese) (See Japanese page) 
(in English) Pedestrian navigation systems are being developed by the spread of GPS.However GPS can cause approximately 100-meter error
by several influences such as the ionosphere and the multipath in urban areas.In urban areas, 100-meter error may give serious confusion because 100-meter square includes several streets.We have been proposing a pedestrian positioning system using a camera phone and road traffic signs for several meter accuracy.The positioning system compares traffic signs photographed by a camera phone with the map database around the position of the user where a mobile phone grasps from the GPS coordinates, and gives the user his/her accurate position.One of the most important subsystem of this positioning system is a recognition system of road traffic signs.Such systems have been developed for cars, but not users with a mobile phone.
We are developing two types recognition systems of road traffics signs.In this paper, we investgate recognition rate using them for given various photograpy conditions.In this investigation, we use the photographs which include road sings taken by the camera phone.Especially we show that the mobile light at night and the backlight at daytime affects the recognition rate drastically.
Keyword (in Japanese) (See Japanese page) 
(in English) pedestrian navigation / GPS / positioning / mobile phone / traffic sign / image recognition / /  
Reference Info. IEICE Tech. Rep., vol. 108, no. 171, ITS2008-14, pp. 37-42, July 2008.
Paper # ITS2008-14 
Date of Issue 2008-07-21 (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 ITS2008-14

Conference Information
Committee ITS  
Conference Date 2008-07-28 - 2008-07-28 
Place (in Japanese) (See Japanese page) 
Place (in English) Nagoya University 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Positioning Systems for ITS, etc. 
Paper Information
Registration To ITS 
Conference Code 2008-07-ITS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Recognition Rate Investigation of Various Photography Conditions for Pedestrian Positioning Using Road Traffic Signs 
Sub Title (in English)  
Keyword(1) pedestrian navigation  
Keyword(2) GPS  
Keyword(3) positioning  
Keyword(4) mobile phone  
Keyword(5) traffic sign  
Keyword(6) image recognition  
Keyword(7)  
Keyword(8)  
1st Author's Name Tomoyuki Kojima  
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 2008-07-28 14:00:00 
Presentation Time 30 minutes 
Registration for ITS 
Paper # ITS2008-14 
Volume (vol) vol.108 
Number (no) no.171 
Page pp.37-42 
#Pages 6 
Date of Issue 2008-07-21 (ITS) 

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