Image encryption method based on integer wavelet transform and compressed sensing

A technology of wavelet transform and compressed sensing, which is applied in image communication, digital transmission system, digital video signal modification, etc., can solve the problems of insufficient encryption security and achieve reversibility, reduce data loss, and strong randomness

Active Publication Date: 2021-07-13
GUANGDONG OCEAN UNIVERSITY
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  • Abstract
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Problems solved by technology

[0006] In order to solve the problem that the current airspace image encryption method based on compressed sensing directly performs carrier embedding after compressed sensing, there is insufficient encryption security, the present invention provides a method based on The image encryption method of integer wavelet transform and compressed sensing can realize reversibility by using integer wavelet transform, reduce data loss caused by frequency domain transform, and improve the encryption security of image information

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  • Image encryption method based on integer wavelet transform and compressed sensing
  • Image encryption method based on integer wavelet transform and compressed sensing
  • Image encryption method based on integer wavelet transform and compressed sensing

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Embodiment

[0065] like figure 1 The shown image encryption method based on integer wavelet transform and compressed sensing includes:

[0066] S1. Select the chaotic system, set the initial value of the chaotic system, determine the plaintext image P whose size is M×N and the pixel sum is S, and preprocess the plaintext image P; in this embodiment, a specific one is selected Plaintext images such as figure 2 shown.

[0067] Specifically, the process of preprocessing the plaintext image P is: divide the plaintext image P into four sub-images Pi, i=1, 2, 3, 4, i represents the serial number of the sub-image; The columns make up the first subgraph P 1 , extract the odd rows and even columns of the plaintext image P to form the second subgraph P 2 , extract the even-numbered and odd-numbered columns of the plaintext image P to form the third sub-image P 3 , extract the even-numbered rows and even-numbered columns of the plaintext image P to form the fourth sub-image P 4 ;In addition, ...

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Abstract

The invention provides an image encryption method based on integer wavelet transform and compressed sensing, and solves the problem of insufficient encryption security of a mode of directly embedding a carrier after compressed sensing in a current spatial domain image encryption method based on compressed sensing. The method comprises the steps: preprocessing a plaintext image, and associating a random sequence generated by a chaotic system with plaintext image information, so that known plaintext attacks and selected plaintext attacks can be powerfully resisted; carrying out sparse processing on the preprocessed plaintext image, and sequentially carrying out scrambling operation; generating a measurement matrix, carrying out compressed sensing on a plaintext image after scrambling operation by using the measurement matrix, executing diffusion operation before embedding a carrier image to further improve the security of image encryption, finally obtaining a frequency coefficient by using integer wavelet transform, carrying out embedding operation on the carrier image, and then executing inverse integer wavelet transform. The data loss caused by frequency domain transformation is reduced, and the encryption security of the image information is improved.

Description

technical field [0001] The present invention relates to the technical field of image encryption, and more specifically, relates to an image encryption method based on integer wavelet transform and compressed sensing. Background technique [0002] With the rapid development of Internet technology and social media, more and more multimedia information is generated and disseminated on the Internet. Among these digital information, digital image is an information format that can transmit information in a visual way, but there will be some private images in these digital images, and the transmission of private images on the network will have certain risks. In order to prevent these digital images containing a large amount of private information from being acquired or used by unauthorized people, image encryption has attracted great attention as an effective means. [0003] According to the different encryption domains, digital image encryption can be divided into frequency domai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/63H04N19/192H04N19/126H04L9/00
CPCH04N19/63H04N19/192H04N19/126H04L9/001
Inventor 黄小玲董友霞叶国栋
Owner GUANGDONG OCEAN UNIVERSITY
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