Yang, Ying, Sun, Xingming, Yang, Hengfu and Li, Chang-Tsun. (2008) Removable visible image watermarking algorithm in the discrete cosine transform domain. Journal of Electronic Imaging, Vol.17 (No.3). ISSN 1017-9909

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Abstract

A removable visible watermarking scheme, which operates in the discrete cosine transform (DCT) domain, is proposed for combating copyright piracy. First, the original watermark image is divided into 16 x 16 blocks and the preprocessed watermark to be embedded is generated by performing element-by-element matrix multiplication on the DCT coefficient matrix of each block and a key-based matrix. The intention of generating the preprocessed watermark is to guarantee the infeasibility of the illegal removal of the embedded watermark by the unauthorized users. Then, adaptive scaling and embedding factors are computed for each block of the host image and the preprocessed watermark according to the features of the corresponding blocks to better match the human visual system characteristics. Finally, the significant DCT coefficients of the preprocessed watermark are adaptively added to those of the host image to yield the watermarked image. The watermarking system is robust against compression to some extent. The performance of the proposed method is verified, and the test results show that the introduced scheme succeeds in preventing the embedded watermark from illegal removal. Moreover, experimental results demonstrate that legally recovered images can achieve superior visual effects, and peak signal-to-noise ratio values of these images are >50 dB. (C) 2008 SPIE and IS&T. [DOI: 10.1117/1.2952843]

Item Type:	Journal Article
Subjects:	Q Science > QA Mathematics > QA76 Electronic computers. Computer science. Computer software
Divisions:	Faculty of Science > Computer Science
Library of Congress Subject Headings (LCSH):	Data encryption (Computer science), Digital watermarking, Digital images -- Watermarking, Discrete cosine transforms, Piracy (Copyright) -- Prevention, Computer algorithms
Journal or Publication Title:	Journal of Electronic Imaging
Publisher:	S P I E - International Society for Optical Engineering
ISSN:	1017-9909
Date:	July 2008
Volume:	Vol.17
Number:	No.3
Number of Pages:	11
Identification Number:	10.1117/1.2952843
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	National Basic Research Program of China (NBRPC), Guo jia zi ran ke xue ji jin wei yuan hui (China) [National Natural Science Foundation of China] (NSFC)
Grant number:	2006CB303000 (NBRPC), 60573045 (NSFC), 60736016 (NSFC)
URI:	http://wrap.warwick.ac.uk/id/eprint/29076

Data sourced from Thomson Reuters' Web of Knowledge

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