DWT-SVD robust blind watermark method based on multilevel DCT

A robust watermarking and watermarking technology, applied in the field of information security, can solve problems such as the adverse effects of large-scale practical promotion of algorithms, sacrificing watermarking capacity, etc., achieving the effect of good robustness and solving watermarking capacity

Active Publication Date: 2014-07-30
HANGZHOU DIANZI UNIV
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Problems solved by technology

Most of the existing robust watermarking algorithms only consider the robustness, while sacrificing the...

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Embodiment Construction

[0018] Below in conjunction with embodiment the present invention is further described.

[0019] The present invention includes watermark embedding and watermark extraction two parts, wherein the specific implementation steps of the first part watermark embedding are as follows:

[0020] Step1: Select Lena with 512×512 pixels as the original carrier image, and perform 8×8 sub-blocking on the low-frequency sub-band after its first-level DWT decomposition to obtain the corresponding sub-matrix.

[0021] Step2: In order to verify the robustness of the present invention in the case of increasing the embedding capacity of the embedded watermark, select binary images of 32×32, 64×64 and 128×128 pixels as the watermark, denoted as W, and perform chaotic encryption on the watermark to obtain W 0 .

[0022] Step3: Perform a DCT transformation on each small block matrix, and then perform a DCT transformation on the 4×4 matrix in the upper left corner of the DCT coefficient matrix once...

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Abstract

The invention relates to a DWT-SVD robust blind watermark method based on multilevel DCT. The method comprises a watermark embedding method and a watermark extraction method. The watermark embedding method includes the steps that discrete waterlet transformation is conducted on an original image, a low-frequency sub-band of the original image is divided into small blocks, multilevel DCT is conducted on each small block, chaotic encryption is conducted on watermarks to be embedded, multilevel DCT coefficients of each small block form a new matrix, and the encrypted watermarks are embedded into a singular value matrix of each new matrix. The watermark extraction method is the inverse process of the watermark embedding method and includes the steps of extraction of the encrypted watermarks and decryption and restoration of the watermarks through secret keys. According to the method, by the combination of the advantages of DWT and SVD on the digital watermark respect and the utilization of the energy concentration characteristic of multilevel DCT, data of which values are large are acquired, the embedded capacity of the watermarks is increased, the characteristic of being good in robustness is still maintained, and the problem of conflicts between the capacity of the watermarks and robustness is well solved.

Description

technical field [0001] The invention belongs to the technical field of information security, in particular to a discrete wavelet transform and singular value decomposition (DWT-SVD) robust watermarking method based on multilevel discrete cosine transform (DCT). Background technique [0002] Because of its important application value in copyright protection and content authentication, digital watermarking technology has become a research hotspot in information hiding technology. Digital watermarking technology embeds information such as numbers, serial numbers, text, and image logos into the media, and modifies the carrier as little as possible during the embedding process to achieve the strongest robustness. When the watermarked media is attacked After that, the watermark can still be recovered or the existence of the watermark can be detected. With the rapid development of information security requirements, invisible watermarking is getting more and more researchers' atten...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 叶学义邓猛惠舒云汪云路陈华华
Owner HANGZHOU DIANZI UNIV
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