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
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[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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