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Paper Abstract and Keywords
Presentation 2014-11-21 13:10
Information hiding in a Jigsaw puzzle pattern -- Implementation in the Android device --
Kenji Togashi, Hiroshi Ito (Nihon Univ.) EA2014-34 EMM2014-62
Abstract (in Japanese) (See Japanese page) 
(in English) We propose an information hiding method using the pattern of a jigsaw puzzle. The method keeps a bit of information in the direction of the curved part of each piece. To decode the hidden information, we compare the number of black pixels present in both areas across the midpoint of each side of the piece, which would be larger in the direction of the curve. The proposed method may use a yellow pattern. The pixel values would vary in the captured image especially when the yellow ink has been used. The colors in the pattern, superimposed characters and background are separated by the k-means method. The pixel values on the pattern are then converted to black while those in other areas are converted to white,
before decoding. We implemented the decoder in the Android terminal. The homography transformation is used to remove distortions in the image when it is taken with the Android device camera. We found by experiment that the error rate has bean larger when the pattern is taken by camera than by scanner.
Keyword (in Japanese) (See Japanese page) 
(in English) Jigsaw puzzle / Geometric pattern / Information hiding / / / / /  
Reference Info. IEICE Tech. Rep., vol. 114, no. 316, EMM2014-62, pp. 37-41, Nov. 2014.
Paper # EMM2014-62 
Date of Issue 2014-11-13 (EA, EMM) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
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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 EA  
Conference Date 2014-11-20 - 2014-11-21 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
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Paper Information
Registration To EMM 
Conference Code 2014-11-EMM-EA 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Information hiding in a Jigsaw puzzle pattern 
Sub Title (in English) Implementation in the Android device 
Keyword(1) Jigsaw puzzle  
Keyword(2) Geometric pattern  
Keyword(3) Information hiding  
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1st Author's Name Kenji Togashi  
1st Author's Affiliation Nihon University (Nihon Univ.)
2nd Author's Name Hiroshi Ito  
2nd Author's Affiliation Nihon University (Nihon Univ.)
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Speaker Author-1 
Date Time 2014-11-21 13:10:00 
Presentation Time 30 minutes 
Registration for EMM 
Paper # EA2014-34, EMM2014-62 
Volume (vol) vol.114 
Number (no) no.315(EA), no.316(EMM) 
Page pp.37-41 
#Pages
Date of Issue 2014-11-13 (EA, EMM) 


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