Color image encryption method and decryption method based on quaternion orthogonal transformation

A color image and orthogonal transformation technology, applied in image data processing, image data processing, instruments, etc., can solve problems such as low algorithm efficiency, anti-attack, and unsatisfactory anti-robustness

Active Publication Date: 2014-12-10
北京画版文化有限公司
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Problems solved by technology

Looking at the existing quaternion-based color image encryption technology, we found that in the existing encryption methods, the ...

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  • Color image encryption method and decryption method based on quaternion orthogonal transformation
  • Color image encryption method and decryption method based on quaternion orthogonal transformation
  • Color image encryption method and decryption method based on quaternion orthogonal transformation

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Embodiment Construction

[0057] The technical solutions provided by the present invention will be described in detail below in conjunction with specific examples. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0058] First, for color images, the present invention defines CS-SQHT, which considers the integrity and correlation of the three channels of color images, and applies traditional CS-SCHT to color image processing more effectively.

[0059] (1) Definition of CS-SQHT

[0060] Before defining CS-SQHT, we first give the definition of CS-NQHT matrix. Order H N is N×N (N=2 n , n is any positive integer) CS-NQHT matrix, its recursive definition is

[0061] H N = H N / 2 ...

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Abstract

The invention discloses an encryption method and a decryption method based on a color image quaternion representing method. Firstly, conjugate symmetric sequency-ordered quaternion Hadamard transform (CS-SQHT) is defined firstly and the defects such as color information loss and non-considered integrality of traditional CS-SCHT (Conjugate Symmetric Sequency-Ordered Complex Hadamard Transform) in color image encryption application; next, color image double-random phase encryption and decryption methods are provided based on CS-SQHT. According to the encryption method and the decryption method based on the color image quaternion representing method, the integrity and the dependency of three channels of a color image are taken into account, and excellent anti-attack robustness is achieved; as a result, the encryption method and the decryption method based on the color image quaternion representing method are obviously superior to the traditional CS-SCHT algorithm and appreciably superior to the existing algorithms based on quaternion; the encryption method and the decryption method are simple to implement, low in time complexity, and obviously superior to the existing algorithms based on quaternion in calculation efficiency.

Description

technical field [0001] The invention belongs to the technical field of digital image encryption, and in particular relates to a color image encryption method and a corresponding decryption method based on conjugate symmetry-column rate quaternion Hadamard transformation. Background technique [0002] With the popularization of the network and the rapid development of information processing and communication technology, multimedia information such as images, audio, and video can be quickly transmitted in various communication networks. While bringing convenience to people, information security issues have gradually aroused people's attention. Pay attention to. As images are the mainstream of information expression, the issue of image information security has naturally become the focus of attention. The rapid development of image acquisition technology and equipment makes most of the real images currently acquired in color, which provide more information and richer visual exp...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 陈北京田翠翠田宇航王定成
Owner 北京画版文化有限公司
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