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Paper Abstract and Keywords
Presentation 2014-03-07 15:00
[Poster Presentation] Comparison of error correction capability between LDPC and Sourlas codes suitable for digital watermarking
Nobuhiro Hirata, Masaki Kawamura (Yamaguchi Univ.) EMM2013-101
Abstract (in Japanese) (See Japanese page) 
(in English) We compare error correction capability between LDPC and Sourlas codes for image digital watermarking. In the case of embedding watermarks by using QIM, messages are extracted with $15%$ error at a maximum due to JPEG compression. We, therefore, consider to correct errors of messages by error-correction codes; LDPC and Sourlas codes. Sourlas code has high redundancy, since messages are encoded by parity bits. By adjusting number of parity bits, messages are encoded by shortest code length of parity bits. In other words, it can decode from a part of parity bits. LDPC code is one of good error-correcting codes. It is difficult to adjust code length of watermarks, and also capability for error correction is different by code rate. When encoding messages by long code length, they are encoded by short code length, and then watermarks are embedded many times. In this case, since errors can be corrected by majority voting, it is possible to improve capability for error correction. In this report, we compare error correction capability between them, and then LDPC code with majority voting has better performance than the others.
Keyword (in Japanese) (See Japanese page) 
(in English) digital watermark / Sourlas codes / LDPC codes / Sum-product decode / quantization index modulation / JPEG compression / /  
Reference Info. IEICE Tech. Rep., vol. 113, no. 480, EMM2013-101, pp. 9-14, March 2014.
Paper # EMM2013-101 
Date of Issue 2014-02-28 (EMM) 
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 EMM  
Conference Date 2014-03-07 - 2014-03-08 
Place (in Japanese) (See Japanese page) 
Place (in English) JAIST 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Poster Session, etc. 
Paper Information
Registration To EMM 
Conference Code 2014-03-EMM 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Comparison of error correction capability between LDPC and Sourlas codes suitable for digital watermarking 
Sub Title (in English)  
Keyword(1) digital watermark  
Keyword(2) Sourlas codes  
Keyword(3) LDPC codes  
Keyword(4) Sum-product decode  
Keyword(5) quantization index modulation  
Keyword(6) JPEG compression  
Keyword(7)  
Keyword(8)  
1st Author's Name Nobuhiro Hirata  
1st Author's Affiliation Yamaguchi Univercity (Yamaguchi Univ.)
2nd Author's Name Masaki Kawamura  
2nd Author's Affiliation Yamaguchi Univercity (Yamaguchi Univ.)
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Speaker Author-1 
Date Time 2014-03-07 15:00:00 
Presentation Time 120 minutes 
Registration for EMM 
Paper # EMM2013-101 
Volume (vol) vol.113 
Number (no) no.480 
Page pp.9-14 
#Pages 6 
Date of Issue 2014-02-28 (EMM) 

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