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Image watermarking method based on phase singular value correction

An image watermarking and singular value technology, applied in image enhancement, image data processing, image data processing, etc., can solve problems such as poor resistance, and achieve good learning ability, high robustness, and good invisibility effects

Inactive Publication Date: 2017-06-06
LIAONING NORMAL UNIVERSITY
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Problems solved by technology

However, the vast majority of image watermark detection methods focus on research against conventional signal processing (such as lossy compression, low-pass filtering, noise interference, etc.), and such as rotation, scaling, translation, row and column removal, shearing , Isogeometric attack resistance is not good

Method used

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  • Image watermarking method based on phase singular value correction
  • Image watermarking method based on phase singular value correction
  • Image watermarking method based on phase singular value correction

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Embodiment Construction

[0037] The method of the invention includes three stages: watermark embedding, geometric correction and watermark extraction.

[0038] Convention: I refers to the host image; x and y represent the number of rows and columns of the image respectively; w refers to the binary watermark image with a size of ; LL represents the watermark coefficient to be embedded; is the quantization step size; Represents a watermarked image; Indicates the corrected watermarked image; EW indicates the extracted watermark information.

[0039] Specific steps such as Figure 5 Shown:

[0040] a.Initial settings

[0041] Get the host image and initialize the settings;

[0042] b. Watermark embedding

[0043] b.1 The original image I undergoes a secondary pyramidal dual-tree directional filter bank (PDTDFB) transformation;

[0044] b.2 Perform block processing on the low-frequency sub-band coefficients of PDTDFB transformation, and the size of each block is ;

[0045] b.3 Modify the wat...

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Abstract

The invention discloses an image watermarking method based on phase singular value correction. The method comprises steps of: firstly embedding a watermark into a low-frequency sub-band transformed by a host image PDTDFB; secondly, extracting the high-frequency sub-band phase matrix of a to-be-detected image subjected to quaternion two-dimensional wavelet transform, subjecting the phase matrix to singular value decomposition (SVD), selecting the first four singular values in the main singular value as the eigenvector of a training sample image, and subjecting the sample to the training learning of geometric transformation parameters such as scaling, translation and rotation so as to obtain an LS-SVR training model; then calculating a mathematical model of the geometric correction of the watermarked to-be-detected image, and determining the model parameters by using the obtained LS-SVR training model to perform geometric correction; and finally, extracting the watermark information from the corrected watermarked image.

Description

technical field [0001] The invention relates to an image watermarking method based on geometric correction, in particular to an image watermarking method based on phase singular value correction, and belongs to the technical field of digital image copyright protection. Background technique [0002] With the rapid development of multimedia and Internet technology, people have entered the information age, digital multimedia products (such as images, audio, video, etc.) Fast access to multimedia resources. However, the resulting multimedia security issues have also become a hot spot for people to pay attention to. Illegal copying and dissemination of digital multimedia products has become easier and easier, which not only damages the interests of copyright owners, but also creates social trust in multimedia security. crisis. As an important branch in the field of information hiding, digital image watermarking technology has emerged as the times require, and it provides an eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00G06T5/00
CPCG06T1/0021G06T2201/0065G06T5/80
Inventor 杨红颖徐欢王向阳牛盼盼
Owner LIAONING NORMAL UNIVERSITY
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