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Paper Abstract and Keywords
Presentation 2009-05-28 11:00
Detecting Nonlinearly-Resized JPEG Images by Analyzing High-Frequency Elements in DCT Coefficients
Tomoaki Matsunami, Toshihiko Yamasaki, Kiyoharu Aizawa (Univ. of Tokyo)
Abstract (in Japanese) (See Japanese page) 
(in English) In this paper, we propose a method for detecting nonlinearly-resized JPEG images. We defined 8x8 periodic blocks as JPEG blocks. JPEG block boundaries are detected applying 8x8 block DCT to all the pixels of the input image and analyzing the high-frequency coefficients in them. If the JPEG block boundaries are not periodic by 8x8, the image is regarded as “forgery”. In order to quantitatively analyze the degree of forgery, we have developed two approaches such as truth-score method and correlation-score method. Experimental results using 375 original (untouched) images and 375 nonlinearly-resized images demonstrated that our proposed method can classify them with over 90% of accuracy.
Keyword (in Japanese) (See Japanese page) 
(in English) Image Forensics / Forgery Detection / JPEG Compression / DCT / / / /  
Reference Info. IEICE Tech. Rep., vol. 109, no. 63, IE2009-12, pp. 11-16, May 2009.
Paper # IE2009-12 
Date of Issue 2009-05-21 (IE, PRMU, MI) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380

Conference Information
Committee PRMU IE MI  
Conference Date 2009-05-28 - 2009-05-29 
Place (in Japanese) (See Japanese page) 
Place (in English) Gifu Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To IE 
Conference Code 2009-05-PRMU-IE-MI 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Detecting Nonlinearly-Resized JPEG Images by Analyzing High-Frequency Elements in DCT Coefficients 
Sub Title (in English)  
Keyword(1) Image Forensics  
Keyword(2) Forgery Detection  
Keyword(3) JPEG Compression  
Keyword(4) DCT  
1st Author's Name Tomoaki Matsunami  
1st Author's Affiliation the University of Tokyo (Univ. of Tokyo)
2nd Author's Name Toshihiko Yamasaki  
2nd Author's Affiliation the University of Tokyo (Univ. of Tokyo)
3rd Author's Name Kiyoharu Aizawa  
3rd Author's Affiliation the University of Tokyo (Univ. of Tokyo)
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Date Time 2009-05-28 11:00:00 
Presentation Time 30 
Registration for IE 
Paper # IEICE-IE2009-12,IEICE-PRMU2009-3,IEICE-MI2009-3 
Volume (vol) IEICE-109 
Number (no) no.63(IE), no.64(PRMU), no.65(MI) 
Page pp.11-16 
#Pages IEICE-6 
Date of Issue IEICE-IE-2009-05-21,IEICE-PRMU-2009-05-21,IEICE-MI-2009-05-21 

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