Digital image steganography method and secret information extraction method

A digital image and secret technology, applied in image data processing, image data processing, instruments, etc., can solve the problems of image quality degradation, increased distortion of steganographic images, imperceptibility of steganographic images and reduced security, etc. Improved imperceptibility and security, effect of small mean square error

Active Publication Date: 2019-05-21
NINGBO UNIV
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Problems solved by technology

[0003] Since the steganographic capacity and image quality are a pair of contradictions, increasing the steganographic capacity will definitely increase the distortion of the steganographic image to a certain extent, degrade the image quality, and thus reduce the imperceptibility and security of the steganographic image

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  • Digital image steganography method and secret information extraction method
  • Digital image steganography method and secret information extraction method
  • Digital image steganography method and secret information extraction method

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Embodiment Construction

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0034] The digital image steganography method provided by the present invention is used to embed the binary secret message S into the original carrier image G whose size is M×N c , which includes the following steps:

[0035] Step (1), first calculate the smallest B,|S that meets the conditions according to the following formulaB |Represents the length of the secret message S in base B, is the rounding down operation;

[0036]

[0037] Step (2), scanning the original carrier image G by raster scanning c , the original carrier image G c Divided into continuous non-overlapping three-pixel group sequence Q, a set of data in the three-pixel group sequence Q contains the pixel values ​​of three pixels, and the group number of the three-pixel group sequence Q is

[0038] Step (3), converting the binary secret message S into a B-ary secret ...

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Abstract

The invention relates to a digital image steganography method which is used for embedding a binary secret message S into an original carrier image Gc with the size of M x N. The digital image steganography method is characterized by comprising the following steps of: firstly calculating a steganography system B of the secret message; Dividing the original carrier image Gc into three continuous pixel group sequences Q which are not overlapped with one another; Converting the binary secret message S into a B-system secret message SB; Taking out a group of data from the three-pixel group sequenceQ according to a sequence; Taking out a bit of secret data dB from the B-system secret message SB according to a sequence; Determining a candidate pixel value field set [phi]B (x, y, z) of the three-dimensional space point (x, y, z), and parameters k1 and k2: searching the candidate pixel value field set [phi]B (x, y, z) to find out (x ', y', z '), and satisfying f (x', y ', z') = dB; Replacing (x, y, z) in the three-pixel-group sequence Q by using (x ', y', z ') to complete steganography embedding of the secret data dB; Compared with the prior art, the method has the advantages that a smaller mean square error can be obtained, and the non-perceptibility and safety of the steganographic image can be effectively improved.

Description

technical field [0001] The invention relates to a digital image steganography method and a secret information extraction method. Background technique [0002] After years of development, the steganography of digital images is becoming more and more perfect, but there is still room for improvement. In particular, steganalysis, the opposite of steganography, is also being continuously improved, which puts forward higher requirements for steganography. In order to ensure the security of covert communication, the imperceptibility and security of steganographic images are crucial performances. Therefore, many scholars have carried out extensive research. [0003] Since the steganographic capacity and image quality are a pair of contradictions, increasing the steganographic capacity will definitely increase the distortion of the steganographic image to a certain extent, degrade the image quality, and thus reduce the imperceptibility and security of the steganographic image. Ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
Inventor 程劼李亚峰戴洪珠
Owner NINGBO UNIV
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