A color image encryption method and device

A color image and encryption method technology, applied in image communication, digital video signal modification, electrical components, etc., can solve the problems of large storage space of ciphertext and cumbersome encryption process, etc.

Active Publication Date: 2021-07-30
CAPITAL NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, Panna and others proposed a color image encryption method based on image sub-block fractional Fourier transform and wavelet transform. This method treats each color component as a grayscale image. The encryption process is not only cumbersome, but also the ciphertext requires a large storage

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  • A color image encryption method and device
  • A color image encryption method and device
  • A color image encryption method and device

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Embodiment Construction

[0045] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0046] The color image encryption method and device according to the embodiments of the present invention will be described below with reference to the drawings. First, the color image encryption method according to the embodiments of the present invention will be described with reference to the drawings.

[0047] figure 1 It is a flowchart of a color image encryption method according to an embodiment of the present invention.

[0048] Such as figure 1 Shown, this color image encryption method comprises the following steps:

[0...

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Abstract

The invention discloses a color image encryption method and device, wherein the method includes: encoding the color image into a first quaternion matrix; dividing the quaternion matrix into sub-blocks that do not Perform modulation and quaternion Gyrator transformation to obtain the second quaternion matrix; extract the real component and the first to third imaginary components of the second quaternion matrix, and construct the first complex matrix and the second complex matrix ; Perform multi-resolution decomposition on the first complex matrix and the second complex matrix to obtain the approximate component and the detail component, and recombine to obtain the third complex matrix and the fourth complex matrix; perform angle calculation on the third complex matrix and the fourth complex matrix is the Gyrator transformation of β to obtain the first ciphertext image and the second ciphertext image respectively. The method effectively avoids the cumbersome single-channel processing method, can hide the meaningful content of the image, and can be applied to the field of multimedia information security.

Description

technical field [0001] The invention relates to the technical field of image encryption, in particular to a color image encryption method and device. Background technique [0002] With the continuous development of image acquisition equipment, more and more color images appear in people's daily life and work. On the one hand, the information presented by these images may contain personal privacy, and is transmitted through the Internet, facing the problem of being illegally disseminated and used. On the other hand, these images can also be easily tampered with using freeware. Therefore, the security of image information is facing great challenges. [0003] For color image encryption, existing grayscale image encryption methods can be used. For example, the color image encryption method based on the index format, this method represents the color image as an integer matrix and a color mapping matrix, and treats the integer matrix as a grayscale image. But this preprocessin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N1/44H04N19/60H04N19/119H04N19/176
CPCH04N1/44H04N19/119H04N19/176H04N19/60
Inventor 邵珠宏尚媛园丁辉王丰赵晓旭刘铁
Owner CAPITAL NORMAL UNIVERSITY
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