Robust digital image adaptive zero-watermarking method

A digital image and digital watermarking technology, applied in image data processing, image data processing, instruments, etc., can solve the problems of unfavorable copyright protection and content authentication of digital media works, and unsatisfactory robustness, and achieve a balance between robustness and imperceptible, robust effect

Inactive Publication Date: 2010-12-08
NINGBO UNIV
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Problems solved by technology

[0011] At present, zero watermark technology is still in the stage of exploration and development. Although many zero watermark methods have been proposed, th

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  • Robust digital image adaptive zero-watermarking method
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Embodiment Construction

[0058] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0059] The present invention proposes an adaptive zero-watermarking method for a digital image, which utilizes the good stability of the wavelet approximation subgraph obtained by the discrete wavelet transform and the translation invariance of the discrete Fourier magnitude spectrum obtained by the discrete Fourier transform, It mainly includes two parts: zero watermark embedding and zero watermark detection. The main process of zero watermark embedding is as follows: first, perform discrete wavelet transform on the original digital image at an appropriate level, and then perform discrete Fourier transform on the obtained wavelet approximation subgraph, Then, according to the size of the binary digital watermark to be embedded, the discrete Fourier magnitude spectrum coefficients satisfying a certain difference are adaptively selected, and fin...

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Abstract

The invention discloses a robust digital image adaptive zero-watermarking method. The method mainly comprises two parts, namely zero-watermark embedding and zero-watermark detection, wherein both the zero-watermark embedding and the zero-watermark detection are performed in a composite domain of discrete wavelet transform and discrete fourier transform; the characteristics of high stability of a wavelet approximation subgraph obtained by the discrete wavelet transform and translation invariance of an amplitude spectrum obtained by the discrete fourier transform are fully utilized, so that the method has high robustness, can resist common image processing and is completely immune from image translation attack; meanwhile, because a binary digital watermark is not embedded into the original digital image but is registered into a watermark database, no damage is caused to the original digital image data, the problem of quality reduction of the image does not exist, the embedded binary digital watermark is completely imperceptible, and the contradiction between the robustness and the imperceptibleness of the digital watermark can be balanced well.

Description

technical field [0001] The invention relates to a digital watermark technology, in particular to a robust digital image self-adaptive zero watermark method. Background technique [0002] With the rapid development of computer network and multimedia technology, digital media such as digital images, digital audio, digital video, etc. become increasingly prominent. For example, any user can easily obtain other people's original digital media through the network, and without the permission of the author or copyright owner, arbitrarily copy, modify and retransmit the original digital media, thereby seriously infringing the author's copyright and Benefits of Copyright Owners. [0003] As a supplement to encryption technology, digital watermarking technology can effectively solve the problems of original digital media security, copyright protection and authentication, and has become an important branch of the current digital media information security field. Digital watermarking...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 周亚训金炜董建峰陈芬杨高波
Owner NINGBO UNIV
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