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Image Hiding, Restoration and Encrypted Transmission Method Based on Phase Cut Fourier Transform

A technology of Fourier transform and inverse Fourier transform, which is applied in the field of image encryption and information security research, can solve problems such as large amount of calculation and incomplete restoration of information, achieve small amount of calculation, improve hiding and restoration efficiency, increase The effect of practicality

Inactive Publication Date: 2017-10-24
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has the disadvantages of large amount of calculation and information cannot be completely restored.

Method used

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  • Image Hiding, Restoration and Encrypted Transmission Method Based on Phase Cut Fourier Transform
  • Image Hiding, Restoration and Encrypted Transmission Method Based on Phase Cut Fourier Transform
  • Image Hiding, Restoration and Encrypted Transmission Method Based on Phase Cut Fourier Transform

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Embodiment 1

[0044] The image hiding method based on phase-cut Fourier transform in this embodiment can be found in figure 1 , including the following steps:

[0045] (1) Two grayscale images of known size M*N, the normalized grayscale value matrix is ​​f, f respectively 1 , where f is the image to be hidden, f 1 as the carrier image.

[0046] (2) F(x,y)=IFT[f(u,v)] can be obtained from the image f(u,v) to be hidden through inverse Fourier transform, and F(x,y) is a complex value, which can be Expressed as Then after phase truncation (that is, extracting the amplitude matrix) and phase preservation (that is, extracting the phase matrix) to get:

[0047] g(x,y)=PT{IFT[f(u,v)]}=|F(x,y)|,

[0048]

[0049] Among them, g(x, y) is the amplitude after phase truncation, and P(x, y) is the retained phase, which is used as the decryption key when restoring.

[0050](3) by the carrier image f 1 (x, y) after Fourier transform, can get F 1 (u,v)=FT[f 1 (x,y)], and then through phase trunc...

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Abstract

The invention discloses an image hiding, restoration and encrypted transmission method based on phase-cut Fourier transform. The image hiding method is: extracting the amplitude matrix g(x, y) of the image f to be hidden after inverse Fourier transform and phase matrix P(x, y), extract the amplitude matrix g1(u,v) and phase matrix P1(u,v) of the carrier image f1 after Fourier transform. Let g'1(u,v)=g1(u,v)+g(x,y), then multiply g'1(u,v) and P1(u,v), and finally go through the Fourier inverse The hidden result is obtained by transformation, and the amplitude matrix f'1(x, y) of the hidden result is extracted to obtain the final hidden result image. Using P(x,y) as the private decryption key, the image hiding method is reversed to obtain the image restoration method. The hidden result obtained by the present invention has very little difference with the carrier image, is very deceptive, and can completely restore the original information, without problems such as image degradation, small amount of calculation, and high security when used for encrypted transmission.

Description

technical field [0001] The invention relates to the field of image encryption and information security research, in particular to an image hiding, restoration and encryption transmission method based on phase-cut Fourier transform. Background technique [0002] With the rapid development of Internet technology and the advent of the information age, the demand for the transmission of a large amount of image information is increasing, and information hiding is an important direction in the research of information security processing. [0003] Information hiding means that the encryptor uses a certain algorithm to hide important information in another information called carrier, so that unauthorized persons cannot know the existence of information from it. Exploring and developing image hiding technology has high academic and application value. Image processing technology based on optical principles is one of the research hotspots in the field of image security processing. At ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00
Inventor 黄佐华曹邦
Owner SOUTH CHINA NORMAL UNIVERSITY
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