Digital image encryption method and apparatus based on fractional order transformation

A digital image, fractional-order technology, applied in the field of digital image encryption based on fractional-order transform, can solve the problems of increasing bandwidth cost, incomplete transform domain image statistical characteristics, poor anti-noise and anti-loss performance, etc., to reduce the bandwidth cost. , Improve the anti-statistical attack characteristics, improve the effect of encryption

Active Publication Date: 2018-07-10
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0004] However, there are some problems in the digital image encryption method based on the prior art, whether it is an image encryption algorithm based on the space domain or the transform domain.
The main disadvantage of the image encryption algorithm based on the spatial domain is that the anti-noise and anti-loss performanc

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  • Digital image encryption method and apparatus based on fractional order transformation
  • Digital image encryption method and apparatus based on fractional order transformation
  • Digital image encryption method and apparatus based on fractional order transformation

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[0055]The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. 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.

[0056] The embodiment of the present invention provides a digital image encryption method based on fractional transformation. The method combines the spatial domain transformation algorithm and the transformation domain algorithm transformation, so as to realize more complete encryption of images, and can effectively Improve the anti-noise and anti-loss performance during the actual transmission of images, reduce the bandwidth cost brought by the transformation ...

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Abstract

The embodiment of the invention provides a digital image encryption method and apparatus based on fractional order transformation, and belongs to the technical field of digital image encryption. The digital image encryption method based on fractional order transformation includes the steps: acquiring the gray value of each pixel of an original image and the image matrix corresponding to the original image; according to the image matrix corresponding to the original image and a preset first scrambling algorithm, determining a spatial domain scrambling image matrix; presetting first fractional order transformation for the spatial domain scrambling image matrix, and obtaining a transformation domain image matrix; according to the transformation domain image matrix, the line number value and the row number value of the image matrix corresponding to the original image, the gray value of each pixel and a preset first diffusion algorithm, determining a diffusion matrix; and according to the diffusion matrix, the transformation domain image matrix and the preset first scrambling algorithm, determining an encryption image matrix. The digital image encryption method based on fractional ordertransformation can improve the anti-noise and anti-loss performance of the cryptograph image during the practical transmission process, and can reduce the bandwidth cost generated during the image transmission process.

Description

technical field [0001] The invention relates to the technical field of digital image encryption, in particular to a method and device for digital image encryption based on fractional transformation. Background technique [0002] With the rapid development of computer and multimedia technology, the transmission of digital images in the network is very frequent. Some image information, such as ID card information pictures, military base pictures and design drawings, etc., not only involves personal privacy, but also has a bearing on national security, so encrypted transmission must be adopted. The two most commonly used encryption algorithms are the image encryption algorithm based on the spatial domain and the image encryption algorithm based on the transform domain. [0003] The image encryption algorithm based on the space domain directly performs a series of processing on the digital image in the space domain, and the typical processing method is the "scrambling-diffusion...

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Application Information

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IPC IPC(8): H04N1/44H04N1/32H04L9/00
CPCH04L9/001H04N1/32154H04N1/32272H04N1/4486
Inventor 胡国真康学净罗暄澍郭子晖
Owner BEIJING UNIV OF POSTS & TELECOMM
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