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SIFT-based blind watermarking method for dwt‑svd against geometric attacks

An anti-geometric attack and blind watermarking technology, applied in the field of information security, can solve the problem of weak ability to resist geometric attacks

Active Publication Date: 2017-06-23
HANGZHOU DIANZI UNIV
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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the existing watermarking algorithm has a weak ability to resist geometric attacks, and proposes a discrete wavelet transform based on scale-invariant feature transform (SIFT) and singular value decomposition (DWT-SVD) to resist geometric attacks. watermark method

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  • SIFT-based blind watermarking method for dwt‑svd against geometric attacks

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Embodiment Construction

[0024] Below in conjunction with embodiment the present invention is further described.

[0025] 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:

[0026] Step1: In the present invention, Lena with 512×512 pixels is selected as the original carrier image, and the watermark embedding area X of the carrier image is subjected to one-level DWT transformation, and its low-frequency sub-bands are divided into 32×32 4×4 non-overlapping of sub-blocks, and each sub-block is denoted as A ij (i=1,2,...32; j=1,2,...32).

[0027] Step2: Select the binary image "information security" of 32×32 pixels as the watermark, denoted as W, and use the logistic mapping chaotic model to perform chaotic encryption on the watermark W to obtain the encrypted watermark W 0 , the mapping initial value is taken as X 0 , chaos coefficient μ∈(3.5699,4], and then the encrypte...

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Abstract

The invention relates to a DWT-SVD geometric attack prevention blind watermark method based on SIFT. 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, singular value decomposition is conducted on each small block, chaotic encryption is conducted on watermarks to be embedded, and the watermarks are embedded into the maximum singular value of each small block through an optimal quantitative method, the SIFT feature points of a watermark image are stored as secret keys, the types of geometric attacks are judged according to the secret keys, and correction is conducted. The watermark extraction method is the inverse process of the watermark embedding method and includes the steps of correction of attacked images, watermark extraction and watermark decryption and restoration. According to the method, by the utilization of the rotation, zoom and translation invariance of the SIFT feature points and the combination of the advantages of DWT and SVD in the digital watermark aspect, robustness on geometric attacks is remarkably improved.

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) anti-geometric attack blind watermarking method based on scale invariant feature transform (SIFT). 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00
Inventor 叶学义陈雪婷邓猛汪云路何志伟赵知劲
Owner HANGZHOU DIANZI UNIV
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