Super-pixel-based quaternion wavelet domain image watermark detection method

A technology of image watermarking and detection methods, applied in image watermarking, image enhancement, image analysis, etc., can solve the problem of not capturing important information and features of two-dimensional images well, large wavelet transform redundancy, weak resistance to geometric attacks, etc. problem, achieving good invisibility and strong robustness

Inactive Publication Date: 2018-05-29
LIAONING NORMAL UNIVERSITY
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Problems solved by technology

Therefore, the wavelet domain transform method has been widely concerned by many researchers, but the wavelet transform also has shortcomings. First, it cannot capture the important information and characteristics of two-dimensional images well; second, the redundancy of wavelet transform Third, the resistance to geometric attacks is weak

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  • Super-pixel-based quaternion wavelet domain image watermark detection method
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  • Super-pixel-based quaternion wavelet domain image watermark detection method

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Embodiment Construction

[0044] The present invention is based on the superpixel quaternion wavelet domain image watermark detection method:

[0045] Convention: I refers to the host image; H represents the entropy value of the superpixel block; Indicates the non-downsampling shearlet transform coefficient to be modified; A fixed value representing the quantization step size; Represents a binary watermark image; round is a rounding function;

[0046] The watermark embedding is carried out according to the following steps:

[0047] a. Initial setup

[0048]Get the host image and initialize variables;

[0049] b. Host image entropy rate superpixel method segmentation

[0050] b.1 Calculate the information entropy of the superpixel block:

[0051] ;

[0052] b.2 Divide superpixels into smooth areas and non-smooth areas according to the average entropy value. H is greater than the average entropy value as a smooth area, and H is less than the average entropy value as a non-smooth area;

[005...

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Abstract

The invention discloses a super-pixel-based quaternion wavelet domain image watermark detection method. Entropy rate super pixel segmentation is carried out on a host image; smooth super pixels and non-smooth super pixels are divided based on average entropy values; a noise point suppression threshold of an SIFER operator is determined adaptively by combining the average entropy value of the superpixels; image feature points are extracted in texture super pixels and the smooth super pixels respectively by using the SIFER operator; an elliptic feature region is constructed by using an auto-correlation matrix R and a final stable elliptic region is screened out by combining an attack result; the constructed elliptic feature region is mapped to be a circular feature region, 0 is supplementedaround the circular feature region to obtain an externally connected square sub image, first-order quaternion wavelet transform is carried out on the square region, and an amplitude matrix and a phase matrix are calculated; and then with a quantization method, watermark embedding is carried out by using the amplitude as a carrier.

Description

technical field [0001] The invention belongs to the technical field of copyright protection of digital images, relates to an image watermark detection method based on a transform domain, and mainly relates to a superpixel-based quaternion wavelet domain image watermark detection method. Background technique [0002] In recent years, with the rapid development of electronics and network information, people live in a high-tech era, and the use of digital multimedia products (such as images, audio, video, etc.) can be seen everywhere, and people can obtain multimedia resources through various convenient channels. However, the potential safety hazards caused by multimedia information have gradually become the focus of people's attention. Some multimedia products are spread and downloaded at will without legal authorization, and seek profits through illegal means, which not only seriously infringes the interests of copyright owners, It also caused social distrust of multimedia in...

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Application Information

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IPC IPC(8): G06T1/00G06T5/00G06T7/11
CPCG06T1/005G06T7/11G06T2207/20064G06T5/70
Inventor 王向阳张思禹牛盼盼
Owner LIAONING NORMAL UNIVERSITY
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