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Paper Abstract and Keywords
Presentation 2008-02-22 13:45
A study for high performance character extraction from color scene images
Masanori Wakabayashi, Keiichiro Shirai, Masayuki Okamoto, Hiroaki Yamamoto (Shinshu Univ.) PRMU2007-240
Abstract (in Japanese) (See Japanese page) 
(in English) This paper describes a robust method for extracting character strings from scene images.In our previous method, character patterns and the background ones are separated by clustering on the color space, then they are classified into character and background by SVM (Support Vector Machine). The extraction performance was not enough for the images where characters are arranged on a complex background, or the character color has changed by the influence of shading. The main reason of this is as follows.Clustering for a whole image region sometimes fails to separate the character color from the background color when their colors are similar or the size of character pattern is very small compared with the size of background pattern. To improve the clustering performance, previous method first divides the image into a rough block based on the edge, and applies clustering for each block. But in this block segmentation, when the background edges are very intense and connected to character edges, preferable block segmentation often can not be done.This paper describes a block segmentation method by using not only magnitude of the edge but also using color information on the edge. This method improves accuracy of the block segmentation, and as a result the performance of character extraction.Proposed method was tested with 251 images from ICDAR 2003 Text Locating Competition, and the effectiveness of this method is confirmed.
Keyword (in Japanese) (See Japanese page) 
(in English) character extraction / clustering / SVM / / / / /  
Reference Info. IEICE Tech. Rep., vol. 107, no. 491, PRMU2007-240, pp. 149-154, Feb. 2008.
Paper # PRMU2007-240 
Date of Issue 2008-02-14 (PRMU) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
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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)
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Conference Information
Committee PRMU  
Conference Date 2008-02-21 - 2008-02-22 
Place (in Japanese) (See Japanese page) 
Place (in English) Univ. of Tsukuba 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To PRMU 
Conference Code 2008-02-PRMU 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A study for high performance character extraction from color scene images 
Sub Title (in English)  
Keyword(1) character extraction  
Keyword(2) clustering  
Keyword(3) SVM  
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1st Author's Name Masanori Wakabayashi  
1st Author's Affiliation Shinshu University (Shinshu Univ.)
2nd Author's Name Keiichiro Shirai  
2nd Author's Affiliation Shinshu University (Shinshu Univ.)
3rd Author's Name Masayuki Okamoto  
3rd Author's Affiliation Shinshu University (Shinshu Univ.)
4th Author's Name Hiroaki Yamamoto  
4th Author's Affiliation Shinshu University (Shinshu Univ.)
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Speaker Author-1 
Date Time 2008-02-22 13:45:00 
Presentation Time 30 minutes 
Registration for PRMU 
Paper # PRMU2007-240 
Volume (vol) vol.107 
Number (no) no.491 
Page pp.149-154 
#Pages
Date of Issue 2008-02-14 (PRMU) 


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