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High-robustness dual transform domain image zero watermarking method

A strong robustness and zero watermark technology, applied in the field of strong robust double transform domain image zero watermark, can solve the problems of unfavorable authentication of copyright, insufficient robustness, etc., and achieve the effect of copyright authentication

Inactive Publication Date: 2009-12-16
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

But most robust watermarking methods are not robust enough to authenticate copyright

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  • High-robustness dual transform domain image zero watermarking method
  • High-robustness dual transform domain image zero watermarking method
  • High-robustness dual transform domain image zero watermarking method

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[0035] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

[0036] The present invention first defines the similarity between the original zero-watermark sequence rw and the extracted zero-watermark sequence rw' as follows: s = 1 - ( Σ j = 1 K rw j ⊕ r w j ′ ) / K , in Represents an XOR operation.

[0037] 1. A method for zero watermarking of images in double transform domain with strong robustness, applicable to the field of copyright authentication of digital images, including the following three processes: ...

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Abstract

A robustness watermarking method plays a significant role in the field of copyright certification. A main problem to be considered in the design of the robustness watermarking method is how to improve the robustness as high as possible on the basis of ensuring excellent invisibility of a watermark. The invention designs a high-robustness dual transform domain image zero watermarking method by using an energy concentration effect of low-frequency sub-bands of a wavelet transformed image and the singular value stability of singular value decomposition. The method comprises the following steps: firstly, subjecting an original image to discrete wavelet transform; secondly, selecting a low-frequency subband for block singular value decomposition; and finally, generating a robustness watermark by judging the parity of a number in the top digit of a maximum singular value of each subblock. The method avoids any change in the original image, thereby having excellent invisibility. Compared with other overwhelming majority of robustness watermarking methods, the method has stronger anti-attack robustness. The method can realize blind copyright certification.

Description

technical field [0001] This patent is to use the energy aggregation effect of the low-frequency sub-band of wavelet transform and the singular value stability of singular value decomposition to invent a robust image zero watermark method, so as to be more conducive to the realization of copyright certification and copyright protection. Background technique [0002] Significant developments in multimedia technology have made it fairly easy to illegally copy and distribute valuable, copyright-protected digital products. This so-called piracy has caused enormous economic losses to the music, video, broadcasting and software industries. Traditional copyright protection methods include: restricting the access of certain sites in the communication network, encrypting multimedia data and strictly managing passwords. This so-called "trust system" achieves copyright protection by preventing unauthorized users from accessing multimedia data. However, once authorized users illegally ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00G06T9/00
Inventor 叶天语马兆丰钮心忻杨义先
Owner BEIJING UNIV OF POSTS & TELECOMM
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