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Color image zero watermarking method based on fast quaternion generalized polar complex exponential transformation

A quaternion and complex exponent technology, which is applied in the field of digital image copyright protection, to achieve the effects of enhancing differentiation, realizing robustness and differentiation, and improving watermark capacity

Active Publication Date: 2019-06-21
LIAONING NORMAL UNIVERSITY
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Problems solved by technology

[0004] The present invention provides a multi-object tampering detection method based on fast quaternion extreme harmonic transformation in order to solve the technical defects existing in the existing zero watermarking scheme

Method used

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  • Color image zero watermarking method based on fast quaternion generalized polar complex exponential transformation
  • Color image zero watermarking method based on fast quaternion generalized polar complex exponential transformation
  • Color image zero watermarking method based on fast quaternion generalized polar complex exponential transformation

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Embodiment Construction

[0044] The present invention provides a multi-object tampering detection method based on fast quaternion extreme harmonic transformation in order to solve the technical defects existing in the existing zero watermark scheme.

[0045] The multi-object tampering detection method based on fast quaternion extreme harmonic transformation includes the following steps: figure 1 as shown,

[0046] Step a: Get host image I and initialize variable M=4N I, s ∈ {2,1,0.5,3};

[0047] Among them, M represents the fast quaternion generalized extremely complex exponential transformation FQGPCET upsampling parameters; N I Refers to the host image size; s represents the generalized extremely complex exponential transformation GPCET basis function parameters;

[0048] Step b: use the fast quaternion generalized extremely complex exponential transformation FQGPCET to obtain the zero watermark;

[0049] Described step b specifically includes:

[0050] Step b.1: Obtain the red, green and blue ...

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Abstract

The invention belongs to the technical field of digital image copyright protection, and particularly relates to a color image zero watermarking method based on rapid quaternion generalized polar complex exponential transformation. The invention provides a color image zero watermarking method based on fast quaternion generalized polar complex exponential transformation, and the method comprises thesteps: firstly, calculating the fast quaternion generalized polar complex exponential transformation FQGPCET of an original carrier image, carrying out the moment selection, and constructing a hybridlow-order moment feature with the good robustness and discrimination; secondly, utilizing asymmetric Tent mapping with good security to encrypt and convert the feature vector into a feature map; then,, scrambling the feature map and the watermark image by using generalized Arnold transformation, and taking the XOR of the scrambling results of the feature map and the watermark image to obtain a zero watermark image which can be used for copyright authentication; and finally, in order to ensure that the copyright can be publicly verified, enabling the credible mechanism to authenticate the zerowatermark, the secret key and the copyright owner identity information and adds a digital timestamp.

Description

technical field [0001] The invention belongs to the technical field of digital image copyright protection, and in particular relates to a color image zero watermark method based on fast quaternion generalized extremely complex exponential transformation. Background technique [0002] With the continuous advancement of science and technology in today's society, the distribution of digital information has become faster and easier; at the same time, the phenomenon of illegal forgery and illegal copying of digital information data has become more common, so the copyright protection of digital information is becoming more and more important . Among them, digital image watermarking technology is an effective means to realize copyright protection. Traditional watermarking methods ensure image copyright by embedding an imperceptible but detectable signal in the original image. However, the watermark images obtained by the above methods are inevitably distorted. Such image distort...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 牛盼盼祁树仁杨红颖王向阳
Owner LIAONING NORMAL UNIVERSITY
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