Novel image scrambling method based on chaotic technology

A technology of image scrambling and technology, applied in image data processing, image data processing, instruments, etc., can solve the problems of sequence randomness decrease, increase algorithm complexity, image scrambling time, unsatisfactory scrambling effect, etc., to achieve Enhance randomness, resist conventional image attacks, and quickly scramble plaintext images

Inactive Publication Date: 2016-09-07
GUANGXI NORMAL UNIV
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Problems solved by technology

The traversal processing through the above two artificial methods will reduce the randomness of the generated sequence, resulting in a relatively high correlation between adjacent pixels in the scramble

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  • Novel image scrambling method based on chaotic technology
  • Novel image scrambling method based on chaotic technology
  • Novel image scrambling method based on chaotic technology

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[0069] Example

[0070] To facilitate the description of the present invention, an image with a size of 10×8 is now taken as an example, and it is scrambled through the Rubik's Cube scrambling algorithm. According to the above scrambling step 1), three initial chaotic sequences x are obtained R (n), x G (n), x B (n). Through step 2) define w as the maximum value of image length and width 10, and control the number of three sets of sequences to 10, and quantize the values ​​of the sequences by formula (2) to obtain three sets of new sequences x′ R (n), x′ G (n), x′ B (n).

[0071] image 3 Take the R layer of a 10×8RGB image as an example, the image has 8 rows, so the value of L is equal to 8, here by x′ G (n), x′ B (n) Two sets of series control the cyclic shift of R layer image:

[0072] a. Judge the parity of the first L / 2 lines, if it is less than or equal to L / 2 odd lines and greater than or equal to L / 2 even lines, pass x′ B (n) The first number x′ of the sequence B (1) Control...

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Abstract

The invention discloses a novel image scrambling method based on a chaotic technology, for controlling a cyclic shift and a rotation angle of an image through chaotic sequences after quantification processing. First of all, through combination with feature values of R, G and B different layers of a color image, three initial values of a chaotic system are generated, and three chaotic sequences are generated through the independent chaotic system; according to maximum values of the length and the width of a plaintext image, defining a variable w and performing quantification processing on the chaotic sequences; and finally, through pairwise combination of the three chaotic sequences, cyclic shift bit numbers and rotation angles of different layers and different row pixels are controlled, and finally a scrambled color image is obtained. According to the invention, the scrambled image has quite good randomness, conventional image attacks can be fended off, and the limitation that pixels, at the same positions, of different image layers have quite high correlation after a conventional scrambling image algorithm is encrypted is also broken.

Description

technical field [0001] The invention relates to the technical field of image encryption, in particular to a novel image scrambling method based on chaos technology. Background technique [0002] Image scrambling refers to confusing the pixels of an image, also called pixel shuffling. Diffusion and confusion are relatively common techniques in today's image encryption technology. Most of the current image encryption methods combine diffusion and obfuscation to encrypt images. Now the image is mainly encrypted in the four directions of pixel domain, chroma domain, frequency domain and bit plane. Researchers mainly process images by optimizing diffusion to make them random and hide the original image information, ignoring the importance of obfuscation algorithms to a certain extent, and these scrambling algorithms are often similar. For example, in the pixel domain, orthogonal transformation, knight tour transformation, Arnold cat mapping, ergodic array algorithm, etc. are u...

Claims

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Application Information

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IPC IPC(8): G06T1/00
CPCG06T1/0021
Inventor 罗玉玲周戎龙丘森辉莫家玲岑明灿刘俊秀
Owner GUANGXI NORMAL UNIV
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