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Color image quick encryption method

A color image and encryption method technology, applied in image data processing, image data processing, instruments, etc., can solve problems such as low security, low decryption efficiency, and inability to change pixel gray distribution characteristics, so as to expand the scope of application and improve Decryption efficiency, the effect of improving the encryption effect

Inactive Publication Date: 2014-10-01
APPLIED TECH COLLEGE OF SOOCHOW UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) The low-dimensional Arnold scrambling transformation cannot change the gray distribution characteristics of pixels, the security is low, the encryption effect is not ideal, and the time of encryption and decryption depends on the encryption cycle, and the speed is limited by the cycle;
[0006] (2) The high-dimensional Arnold transformation can change the gray distribution characteristics of pixels, which has good security, but the iteration cycle of the high-dimensional Arnold scrambling transformation is longer, and the decryption efficiency is low;
[0007] (3) The Arnold transformation has requirements on the shape of the image, and the Arnold transformation operation is only applicable to the square matrix, which greatly restricts the scope of use of the encryption system

Method used

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Embodiment 1

[0034] Embodiment one: see figure 1 As shown, a color image fast encryption method is implemented based on Arnold transform, including the following steps:

[0035] 1) Process the image into blocks according to the image size;

[0036] 2) Use the Arnold transform to simultaneously scramble the positions and gray levels of the three primary color components of the image pixel to complete the encryption of the color image;

[0037] 3) Inverse transform the transformation in step (2) to complete the decryption of the encrypted image.

[0038] In this embodiment, in the step 1), if the length and width of the image are wm and wn respectively, then , divide the image into N blocks, and the size of each block is ,in, , Indicates to take When encrypting, the smallest integer is encrypted block by block in sequence. If the length of the last block is less than wn, the adjacent image that has already been encrypted is used to make up the length wn.

[0039] In the step (2...

Embodiment 2

[0049] Embodiment two: see figure 2 As shown, a 256×256 color image is encrypted and decrypted, where (a) and (b) are the encrypted and decrypted images respectively, and the total time required for encryption and decryption is 0.703000s, compared with the existing technology , the highest efficiency can be increased by more than eighty times.

[0050] see image 3 As shown, different methods are used to encrypt the same color image, where (a) is the original image; (b) is the encrypted image based on the two-dimensional Arnold transformation, which can only change the position of the pixel, but not the pixel gray value; (c) is an encrypted image based on the three-dimensional Arnold transformation, which only changes the gray value of the pixel, leaving the outline of the original image in some areas; (d) is the encrypted image of the technical solution of the present invention, The color distribution is uniform and the intuitive effect is good.

[0051] see Figure 4 As...

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Abstract

The invention discloses a color image quick encryption method implemented on the basis of Arnold transform. The method includes the steps that an image is chunked according to the size of the image before encryption, then positions and gray levels of three primary color components of an image pixel are scrambled at the same time by means of Arnold transform to achieve encryption of the color image, and inverse transformation is carried out on transform in the preceding steps to decrypt the encrypted image. Through improvement of the prior art, the encryption effect is improved, encryption efficiency is improved, and the application range is widened.

Description

technical field [0001] The invention relates to a digital signal encryption method, in particular to a color image fast encryption method. Background technique [0002] As a main component of multimedia data, color images must be encrypted reliably in order to ensure their security during transmission. Many current encryption algorithms are limited to binary or grayscale images. Compared with general text data, color image data has a large amount of data information and a high degree of correlation between data. The encryption process must consider not only the change of subjective visual effects but also the change of objective correlation between data. The amount of calculation is large and time-consuming; the encryption of transmitted color images requires real-time performance, so the research on encryption efficiency is particularly important. [0003] In recent years, many articles have proposed image encryption algorithms based on chaotic systems or hyperchaotic sys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
Inventor 彭静玉
Owner APPLIED TECH COLLEGE OF SOOCHOW UNIV
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