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Color image compression encryption method based on two-dimensional compressed sensing and memristor chaotic system

A chaotic system, two-dimensional compression technology, applied in the direction of secure communication through chaotic signals, transmission systems, digital transmission systems, etc., can solve the problems of limited compression rate, low, security of scrambling diffusion method, etc.

Active Publication Date: 2020-09-01
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of limited compression rate and low security of scrambling and diffusion methods in some current image compression encryption algorithms based on compressed sensing, the present invention provides a color image compression method based on two-dimensional compressed sensing and memristive chaotic system encryption method

Method used

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  • Color image compression encryption method based on two-dimensional compressed sensing and memristor chaotic system
  • Color image compression encryption method based on two-dimensional compressed sensing and memristor chaotic system
  • Color image compression encryption method based on two-dimensional compressed sensing and memristor chaotic system

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Embodiment 1

[0094] like figure 1 As shown, the embodiment of the present invention provides a color image encryption method based on two-dimensional compressed sensing and memristive chaotic system, comprising the following steps:

[0095] S101: Decompose the color plaintext image P with a size of M×N into RGB to obtain three components of RGB, and perform two-dimensional discrete wavelet transform on the three components of RGB respectively to obtain a sparse coefficient matrix R 1 , G 1 and B 1 ;

[0096] S102: According to the information entropy h of the RGB three-component r 、h g and h b , and the preset external key t 1 , t 2 , t 3 and t 4 , to generate the initial value x of the 4D memristive chaotic system 0 、y 0 ,z 0 and w 0 , according to the initial value x 0 、y 0 ,z 0 、w 0 Generation of four chaotic sequences X using a 4D memristive chaotic system 1 , Y 1 ,Z 1 and W 1 ;

[0097] Specifically, the embodiment of the present invention can adopt a new 4D memr...

Embodiment 2

[0116] On the basis of the above examples, if figure 2 As shown, the embodiment of the present invention also provides a color image encryption method based on two-dimensional compressed sensing and memristive chaotic system, comprising the following steps:

[0117] S201: Decompose the color plaintext image P with a size of M×N into RGB to obtain three components of RGB, and perform two-dimensional discrete wavelet transform on the three components of RGB respectively to obtain a sparse coefficient matrix R 1 , G 1 and B 1 ;

[0118] S202: Generate an initial value x of the 4D memristive chaotic system 0 、y 0 ,z 0 and w 0 , and generate four chaotic sequences X based on the initial value 1 , Y 1 ,Z 1 and W 1 , including the following substeps:

[0119] S2021: Calculate the information entropy h of the RGB three-component according to formula (4) r 、h g and h b :

[0120]

[0121] In formula (4), b is a bit level.

[0122] S2022: According to the information...

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Abstract

The invention provides a color image compression encryption method based on two-dimensional compressed sensing and a memristor chaotic system. The method comprises the following steps: decomposing a plaintext image into R, G and B components; respectively performing two-dimensional discrete wavelet transform on the two-dimensional discrete wavelet transform to obtain three sparse coefficient matrixes; performing double random position scrambling on the sparse coefficient matrix by adopting Arnold mapping and an index vector, performing two-dimensional compressed sensing and quantification on the scrambled matrix, performing simultaneous multi-random pixel value diffusion in R, G and B components and among the components on the quantified matrix, and finally obtaining a ciphertext image. Aninitial value of a 4D memristor chaotic system is generated by using the information entropy of a plaintext image and an external key, then the initial value is substituted into a 2D-LSCM chaotic system, and two measurement matrixes are constructed by using a generated chaotic sequence. According to the method, the gray values of the ciphertext image are uniformly distributed, so an attacker difficultly performs statistical attack analysis on the ciphertext image to obtain plaintext information, and the security level of the method is enhanced.

Description

technical field [0001] The invention relates to the technical field of image encryption, in particular to a color image compression encryption method based on two-dimensional compressed sensing and memristive chaotic system. Background technique [0002] As a carrier of information, images are widely used because they are vivid, vivid, intuitive, can be stored for a long time, and are easy to transmit. Some of the image information may involve personal privacy, business secrets, military secrets and even national security. Once it is copied, maliciously spread or tampered by attackers during network transmission, the consequences will be very serious. Encrypting images to make meaningful images meaningless can effectively protect the security of these private information in transmission and storage. In our daily life, most of our common images are color images, which have inherent characteristics such as large data volume, high redundancy, strong correlation between adjacen...

Claims

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Application Information

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IPC IPC(8): H04L9/00H04L29/06
CPCH04L9/001H04L63/0428H04L69/04
Inventor 柴秀丽王音景田野毕建强付江豫支相丞甘志华路杨
Owner HENAN UNIVERSITY
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