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Digital image disguising and reconstructing method based on block sequences

A digital image and sequence technology, applied in image data processing, image data processing, instruments, etc., can solve the problem of low visual quality of camouflage images

Active Publication Date: 2015-08-12
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the proposed strategy is the same as the traditional Tangram method, only 8 equidistant transformations, resulting in low visual quality of the camouflage image in the channel

Method used

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  • Digital image disguising and reconstructing method based on block sequences
  • Digital image disguising and reconstructing method based on block sequences
  • Digital image disguising and reconstructing method based on block sequences

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Embodiment

[0235] Taking JAVA jdk1.7.0_09 as the case implementation environment, the implementation of the present invention will be described in detail in conjunction with the accompanying drawings, but not limited to this implementation case, where figure 2 is a fake flow chart, image 3 is the recovery flow chart.

[0236] Encryption process:

[0237] Step 1: Select the secret image B such as Figure 4 As shown, divide it into 64×64 sub-blocks B of 4×4 size i,j , i=0,1,...,63, j=0,1,...,63, the two parties agree on a meaningful image that has nothing to do with the secret image as the public image A, such as Figure 5 As shown, it is divided into 64×64 sub-blocks A of 4×4 size i,j , i=0,1,...,63, j=0,1,...,63;

[0238] Step 2: Insert A i,j and B i,j according to S A i , j = MSCAN ( A ...

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Abstract

The invention discloses a digital image disguising and reconstructing method based on block sequences. The method comprises the following steps: sub blocks obtained by dividing public image and secret image matrixes are scanned into sequences as secret sequences and public sequences; random disturbance is added to the sequences with the same element value; and least squares matching is performed directly on isometric transformation sequences obtained by cyclically moving the secret sequences rightwards and the public sequences in corresponding positions to find out the cyclical rightward moving step size with minimum residual and matching parameters, so that a secret image is disguised as a public image, and the disguised public image can be reconstructed as a secret image. The method of the invention is easy to implement. As only matching of isometric transformation sequences in corresponding positions is performed, the encoding time is reduced, the number of isometric transformations is increased, the matching accuracy is improved, the problems of detail loss and overflow caused by transformation from a smooth block to a complex block and recovery from a smooth block to a complex texture block can be effectively avoided, and the visual quality of disguised and reconstructed images is further improved.

Description

technical field [0001] The invention belongs to the technical field of information security and digital image signal processing, and relates to a digital image camouflage method, in particular to a block sequence-based digital image camouflage and reconstruction method. Background technique [0002] In recent years, with the development of computer and network technology, more and more digital images are spread in public channels. Unrestricted access to and use of secret images not only involves personal privacy, media credibility, and government integrity, but can also lead to social unrest and induce military conflicts. [0003] How to effectively protect secret images transmitted in public channels has become a hot research topic at present. Aiming at this problem, people have proposed a variety of image protection methods, such as digital image encryption technology that converts plaintext images into ciphertext and digital image camouflage technology. Compared with di...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 邵利平李苑梦谢贤文
Owner SHAANXI NORMAL UNIV
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