Digital watermarking method based on structured Bayesian compressive sensing

A Bayesian compression, digital watermarking technology, applied in the fields of information encryption, information and communication technology, can solve the problems of high robustness and invisibility

Active Publication Date: 2017-05-24
HANGZHOU NORMAL UNIVERSITY
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Problems solved by technology

This embedding method is relatively safe and requires a large amount of calculation, but it has high robustness and invisibility

Method used

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  • Digital watermarking method based on structured Bayesian compressive sensing
  • Digital watermarking method based on structured Bayesian compressive sensing
  • Digital watermarking method based on structured Bayesian compressive sensing

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Embodiment Construction

[0071] The present invention is further analyzed below in conjunction with specific embodiment.

[0072] The digital watermarking method based on structured sparse Bayesian compressive sensing includes digital watermark embedding and extraction process:

[0073] (1) The embedding process of digital watermark, such as figure 2 shown.

[0074] Step (1.1): Thinning of the watermark image

[0075] Since the transform coefficients of most pictures under the discrete wavelet transform base are sparse, the sparse coefficients of the watermark pictures are obtained through discrete wavelet transform, see formula (1) for details. Such coefficients are characterized by a tree structure.

[0076] f = Ψ f x (1)

[0077] Where f is the pixel matrix of the watermark image, Ψ f is the N×N-dimensional transformation base of the watermark image, and x is the N×N-dimensional sparse coefficient of the watermark image, referred to as the watermark sparse coefficient;

[0078] Step (1.2): ...

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Abstract

The invention discloses a digital watermarking method based on structured Bayesian compressive sensing; according to the method, sparse priors are set in a Bayesian compressive sensing model with signal structured priors introduced, such that Bayes gains better performance to restore signals, and attack resistance of digital watermarks is improved. The digital watermarking method based on structured Bayesian compressive sensing is easy to implement, is friendly to the displaying of carrier images, and has good transparency and robustness.

Description

technical field [0001] The invention relates to the fields of information and communication technology and information encryption, in particular to a digital watermarking method. Background technique [0002] In today's society, with the rapid development of informatization and networking, piracy has become the biggest threat to digital products. For digital media copyright owners, anti-piracy rights protection is an urgent problem to be solved. [0003] Digital watermarking is a common way of copyright protection. Digital watermark technology is to embed some identification information (that is, digital watermark) into digital carriers (including multimedia, documents, software, etc.), without affecting the use value of the original carrier, and it is not easy to be detected and modified again, but can be generated by the party Identify and identify. The carrier information of digital watermark can be text, image, audio, video, database and so on. In order to ensure the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F21/16
CPCG06F21/16G06F21/1063
Inventor 李秀梅吕军苗依迪
Owner HANGZHOU NORMAL UNIVERSITY
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