A Method of Image Encryption Using Nonlinear Low-pass Filter

A low-pass filtering and non-linear technology, applied in the field of image encryption using non-linear low-pass filtering, can solve problems such as difficult expansion, low-pass transformation distortion, etc., achieve convenient encryption and decryption, improve security, and high engineering application value Effect

Active Publication Date: 2021-09-21
NAVAL AVIATION UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for implementing image encryption using nonlinear low-pass filtering, and then to a certain extent overcome the problems of difficult expansion and low-pass transformation distortion existing in traditional image encryption and decryption algorithms

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  • A Method of Image Encryption Using Nonlinear Low-pass Filter
  • A Method of Image Encryption Using Nonlinear Low-pass Filter
  • A Method of Image Encryption Using Nonlinear Low-pass Filter

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[0067] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided in order to give a thorough understanding of embodiments of the invention. However, those skilled in the art will appreciate that the technical solution of the present invention may be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. may be adopted. In other instances, well-known technical solutions have not been shown or descr...

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Abstract

The invention provides a method for implementing image encryption by using nonlinear low-pass filtering, which is suitable for image data encryption and decryption transmission. This method is mainly to perform normalized preprocessing on the image data, firstly perform a scalable first low-pass filter transformation, and use the transformation parameters as the first key; then perform a secondary low-pass filter transformation, and use the transformation parameters as The second key is to perform nonlinear symmetric transformation to complete image encryption, and inform the receiver of the transformation parameters as the third key, and then the receiver uses the three major keys to perform corresponding inverse transformations in turn to complete the decryption of image data. The advantage of this method is that whether it is low-pass filter transformation or nonlinear symmetric transformation, it is very easy to expand, realize multiple encryptions, and improve the security of files. At the same time, the distortion of the decryption process is small, and the decryption method is basically similar to the encryption method, only the parameters are different, which is very convenient for engineering application.

Description

technical field [0001] The invention relates to the field of image encryption and restoration, in particular to a method for implementing image encryption by using nonlinear low-pass filtering. Background technique [0002] With the development of society and network, more and more images are spread on the Internet. In some important financial and military fields, the security of image transmission has attracted more and more researchers' attention. Image encryption and decryption technology has developed rapidly in recent decades. Low-pass filters are generally used in digital signal processing for filtering signals with noise. But it can also be applied to the encryption and decryption of image signals. At present, there are not many studies on the application of low-pass filtering to encryption and decryption. The main reason is that encryption is easy to decrypt but difficult to decrypt. Due to the inevitable differential operation in the decryption process, it is ve...

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H04N1/32H04N1/44
CPCH04N1/32272H04N1/4486
Inventor雷军委李辉梁勇王玲玲闫实
OwnerNAVAL AVIATION UNIV