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Paper Abstract and Keywords
Presentation 2017-05-22 14:05
Watermarking Scheme with Large Capacity Considering the Internal Structure of PDF File
Takuya Fukushima, Minoru Kuribayashi, Nobuo Funabiki (Okayama Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) PDF files are popular format of digital documents that can be displayed on digital devices such as PC, tablet, and smart phone. Because of its popularity, the illegal use of PDF files may cause serious trouble. Therefore, the watermarking technique for preventing illegal use is necessary. In this paper, we propose a high capacity watermarking scheme which changes the spaces among words and letters in PDF files. We regard the sequence of the spaces as a host vector, and modies the vector based on a signal processing technology. To control the space changes produced by the embedding, the watermark is inserted into the frequency components converted from the vector by DCT(Discrete Cosine Transform). Before the DCT, the elements in the host vector is randomly permuted according to a secret key. Such an operation makes the removal and modification of watermark difficult without the secret key. Through computer simulation, the changes of PDF file size and the degradation of the visual appearance are numerically evaluated.
Keyword (in Japanese) (See Japanese page) 
(in English) PDF / watermarking / vector / DCT(Discrete Cosine Transform) / / / /  
Reference Info. IEICE Tech. Rep., vol. 117, no. 40, EMM2017-3, pp. 13-18, May 2017.
Paper # EMM2017-3 
Date of Issue 2017-05-15 (IT, EMM) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380

Conference Information
Committee EMM IT  
Conference Date 2017-05-22 - 2017-05-23 
Place (in Japanese) (See Japanese page) 
Place (in English) Yamagata University(Yonezawa Campus) 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Information Security, Information Theory, Information Hiding, etc. 
Paper Information
Registration To EMM 
Conference Code 2017-05-EMM-IT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Watermarking Scheme with Large Capacity Considering the Internal Structure of PDF File 
Sub Title (in English)  
Keyword(1) PDF  
Keyword(2) watermarking  
Keyword(3) vector  
Keyword(4) DCT(Discrete Cosine Transform)  
1st Author's Name Takuya Fukushima  
1st Author's Affiliation Okayama University (Okayama Univ.)
2nd Author's Name Minoru Kuribayashi  
2nd Author's Affiliation Okayama University (Okayama Univ.)
3rd Author's Name Nobuo Funabiki  
3rd Author's Affiliation Okayama University (Okayama Univ.)
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Date Time 2017-05-22 14:05:00 
Presentation Time 25 
Registration for EMM 
Paper # IEICE-IT2017-3,IEICE-EMM2017-3 
Volume (vol) IEICE-117 
Number (no) no.39(IT), no.40(EMM) 
Page pp.13-18 
#Pages IEICE-6 
Date of Issue IEICE-IT-2017-05-15,IEICE-EMM-2017-05-15 

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