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Single channel color image encryption method based on GT conversion and chaos

A color image and encryption method technology, applied in the field of virtual optical information encryption, can solve the problems of low security and small key space, etc.

Inactive Publication Date: 2014-04-30
XIAN UNIV OF TECH
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Problems solved by technology

[0006] The purpose of the present invention is to propose a single-channel color image encryption method based on GT transformation and chaos to solve the problems of small key space and low security in the prior art

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  • Single channel color image encryption method based on GT conversion and chaos
  • Single channel color image encryption method based on GT conversion and chaos
  • Single channel color image encryption method based on GT conversion and chaos

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Embodiment Construction

[0047] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0048] The invention discloses a single-channel color image encryption method based on GT transformation and chaos. The method includes a two-layer encryption framework.

[0049] Specific steps are as follows:

[0050] The first layer of encryption framework:

[0051] Step 1: Take the color image "Baboon.jpg" of 512 × 512 pixels as an example, perform the normalization operation on "Baboon.jpg", and decompose the normalized "Baboon.jpg" into R, G, B-component images, denoted as r(x,y), g(x,y) and b(x,y) respectively.

[0052] Step 2: The number of iterations is n respectively for the component images r(x,y), g(x,y) and b(x,y) 3 , n 2 and n 1 Arnold transform of , the scrambled noise image is denoted as A n3 (r(x,y)), A n2 (g(x,y)) and A n1 (b(x,y)).

[0053] The third step: first obtain the first chaotic phase modulation function, whic...

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Abstract

A single channel color image encryption method based on GT conversion and chaos relates to two encryption frames. In the first encryption frame, first, normalization operation is performed on a color image, and the normalized image is decomposed into three red, green and blue component images; then, Arnold conversion is performed on the three component images to perform pixel permutation; finally, Logistic chaotic mapping, tent chaotic mapping and Gyrator conversion with an rotating angle of alpha are used for combining the three component images in chaos into data information relevant to a three-channel structure; in the second encryption frame, first, Arnold conversion is performed on data information relevant to the three-channel structure; then, phase modulation is performed on the Arnold conversion result; finally, Gyrator conversion is performed on a phase modulation result, the encryption process is completed, and gray image information is obtained.

Description

technical field [0001] The invention belongs to the technical field of virtual optical information encryption methods, and relates to a single-channel color image encryption method based on GT (rotation) transformation and chaos. Background technique [0002] In recent years, optical encryption technology has played an increasingly important role in information security. Since Refregier and Javidi proposed encryption based on double random phase, researchers have proposed various image encryption techniques, such as fractional Fourier transform and extended fractional Fourier transform, phase recovery process and random pixel scrambling operation. The main disadvantage of these methods is that a single beam of light is used to illuminate the input picture, so that the color information of the decrypted image is lost. Therefore, color image encryption has become a serious problem and a difficult problem for optical applications. [0003] Karim et al. proposed a color image ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
Inventor 隋连升段快快陈涛芦海伟
Owner XIAN UNIV OF TECH
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