Self-adapting attack method for discrete cosine transform domain digital watermarking system
Title：
Self-adapting attack method for discrete cosine transform domain digital watermarking system
Application Number：
 200710178089
Application Date：
 2007/11/26
Announcement Date：
 2008/04/09
Pub. Date：
Publication Number：
 101159059
Announcement Number：
Grant Date：
Granted Pub. Date：
ApplicationType：
 Invention
State/Country：
 11[China|beijing]
IPC：
 G06T 1/00
Applicant(s)：
 Tsinghua University
Inventor(s)：
 Wang Daoshun, Zhang Tao, Liang Jinghong, Luo Ping, Dai Yiqi
Key Words：
 Self-adapting attack method, discrete cosine, transform domain, digital watermarking system
Abstract：
 The invention discloses a self-adaptable attack method for a discrete cosine transform domain digital watermarking system and belongs to the technical field of digital watermarking. The method includes: acquiring a digital watermarking image; dividing the digital watermarking image into a plurality of sub-blocks each having n multiplied by n pixels, and acquiring human viral system classification results on the sub-blocks to obtain superposition strength of watermarking components; performing one attack on each sub-block with a periodical transformation matrix to obtain the attacked sub-blocks matrix; calculating signal-to-noise ratio of the peak value, and performing a second attack or outputting the image. The periodical transformation matrix should satisfy the two following formulas: (1) Phi(Xn)=AXn(modN), wherein A is a periodical transformation matrix, A=(aij)n multiplied by n, aij is an integer, Phi(Xn) and Xn are original divided sub-blocks matrixes, Xn=(x1 to xn), Xn'=(x1' to xn'), x1 to xn belong to {0, 1, ellipsis, N-1}, and N is the transformation order; and (2) A(modN)=En, wherein mN is the period for transformation of Xn'=Phi(Xn) and En is an n-ordered identity matrix. The inventive method can detect robustness of the present watermarking system, and as the same method is adopted for attack and recovery, calculation is simple and effective. The invention can promote development of the digital watermarking system.
Claim：
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PCT：
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