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Paper Abstract and Keywords
Presentation 2014-07-17 14:25
Extended LZW codes with Modified Reduplicative Parsing
Yuta Takabayashi, Hirosuke Yamamoto (Univ. of Tokyo) IT2014-19
Abstract (in Japanese) (See Japanese page) 
(in English) The LZW code is categorized as the so-called dictionary method in the universal data compression codes and is used in GIF, TIFF, Unix Compress, etc. However, since the dictionary growing speed is not fast, the compression rate is not so good. On the other hand, a compression scheme is proposed based on the reduplicative parsing method to improve the dictionary growing speed. In this scheme we can realize the fast growing of the dictionary by storing the reduplicated sequence of a parsed one into the dictionary. But, the reduplicated sequence is not a sequence actually appeared in the past. In order to improve the above week points, we propose a new parsing method called ``concatenated parsing" and modified LZW codes based on the concatenated parsing. Furthermore, we evaluate the performance the modified LZW codes for Canterbury and Calgary corpuses.
Keyword (in Japanese) (See Japanese page) 
(in English) LZW code / universal data compression code / reduplicative parsing / concatenated parsing / / / /  
Reference Info. IEICE Tech. Rep., vol. 114, no. 138, IT2014-19, pp. 43-48, July 2014.
Paper # IT2014-19 
Date of Issue 2014-07-10 (IT) 
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 IT  
Conference Date 2014-07-17 - 2014-07-18 
Place (in Japanese) (See Japanese page) 
Place (in English) Kobe University 
Topics (in Japanese) (See Japanese page) 
Topics (in English) freshman session, general 
Paper Information
Registration To IT 
Conference Code 2014-07-IT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Extended LZW codes with Modified Reduplicative Parsing 
Sub Title (in English)  
Keyword(1) LZW code  
Keyword(2) universal data compression code  
Keyword(3) reduplicative parsing  
Keyword(4) concatenated parsing  
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1st Author's Name Yuta Takabayashi  
1st Author's Affiliation The University of Tokyo (Univ. of Tokyo)
2nd Author's Name Hirosuke Yamamoto  
2nd Author's Affiliation The University of Tokyo (Univ. of Tokyo)
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Speaker Author-1 
Date Time 2014-07-17 14:25:00 
Presentation Time 25 minutes 
Registration for IT 
Paper # IT2014-19 
Volume (vol) vol.114 
Number (no) no.138 
Page pp.43-48 
#Pages
Date of Issue 2014-07-10 (IT) 


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