Image compression encryption method based on compressed sensing and nonlinear diffusion

A non-linear diffusion and image compression technology, which is applied in the field of information security and can solve the problems of unsatisfactory image reconstruction quality.

Pending Publication Date: 2020-10-23
HARBIN INST OF TECH AT WEIHAI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the one hand, the image reconstruction quality after compression and encryption is not ideal

Method used

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  • Image compression encryption method based on compressed sensing and nonlinear diffusion
  • Image compression encryption method based on compressed sensing and nonlinear diffusion
  • Image compression encryption method based on compressed sensing and nonlinear diffusion

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with the embodiments. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0016] Such as figure 1 As shown, the image compression encryption method proposed by the present invention mainly contains the following steps:

[0017] Step 1. For an image X with a size of 256×256, use discrete wavelet transform to thin it out to obtain a sparse coefficient matrix D of the same size;

[0018] Step 2. Set a threshold Ts to 0.085, and set it to 0 for elements in D whose value is less than Ts, and get D 1 ;

[0019] Step 3. In order to uniform the sparsity of each row of the matrix, we use the sparse coefficient matrix D 1 Perform zigzag sc...

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Abstract

The invention discloses an image compression encryption method based on compressed sensing and nonlinear diffusion, and belongs to the technical field of information security. The invention provides the image compression encryption method based on compressed sensing and non-linear diffusion, and aims to solve the problem of security risk due to reservation of statistical information of an image during image encryption of compressed sensing. Firstly, sparse representation is carried out on an original image, then a compressed sensing strategy is carried out, then a measurement value obtained through compressed sensing is encrypted through shifting, exclusive OR and other operations, and a final ciphertext is obtained. Through experimental verification and analysis, the image compression andencryption performance of the method is excellent, the image compression is carried out while the image encryption security is ensured, the calculation overhead and the storage overhead are reduced as much as possible, and the method can be widely applied to a resource-limited environment.

Description

technical field [0001] The invention belongs to the technical field of information security, and in particular relates to an image compression and encryption method based on compressed sensing and nonlinear diffusion. Background technique [0002] With the rapid development of information technology, people's communication methods have undergone great changes, and people's needs for the transmission of multimedia information such as images have greatly increased. In order to prevent the leakage of important information in the communication process, it is necessary to encrypt the image data. Also, in some cases it is important to compress images due to bandwidth and storage constraints. [0003] Traditional image encryption technology can only realize image encryption. As a novel signal sampling theory, compressed sensing can realize image compression and encryption at the same time. Therefore, compressive sensing has been applied to image compression and encryption schemes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/48H04N19/63G06F7/78G06F17/14
CPCG06F7/78G06F17/148H04N19/48H04N19/63
Inventor 佟晓筠刘金龙张淼
Owner HARBIN INST OF TECH AT WEIHAI
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