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Adaptive spatial steganographic method based on adjacent pixel difference

An adjacent pixel, self-adaptive technology, applied in image data processing, image data processing, instruments, etc., can solve problems such as poor self-adaptive ability and poor safety performance

Inactive Publication Date: 2009-11-18
SUN YAT SEN UNIV
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Problems solved by technology

[0004] Aiming at the shortcomings of existing methods such as poor self-adaptability and poor security performance, the present invention designs a space-space steganography method with strong self-adaptability and high security to realize the secret transmission of information

Method used

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  • Adaptive spatial steganographic method based on adjacent pixel difference
  • Adaptive spatial steganographic method based on adjacent pixel difference
  • Adaptive spatial steganographic method based on adjacent pixel difference

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Embodiment Construction

[0057] The present invention will be further described below in conjunction with the accompanying drawings.

[0058] figure 1 What is shown is a schematic diagram of the algorithm flow of the embedding and extraction of secret information in the present invention.

[0059] The embedding process of the secret information includes steps: (11) image block rotation; (12) image data rearrangement and grouping; (13) estimating the embedding capacity of the image; (14) modifying the middle pixel of the embedding unit to realize information embedding; (15) ) embedding of image re-rotation and threshold T.

[0060] Each step is described in detail as follows:

[0061] (11) Image block rotation

[0062] Suppose the image to be detected is I, and its size is M×N. like figure 2 As shown, at first I is decomposed into Bz×Bz (setting Bz=6) small block Blk(j) of no overlapping area, j = 1,2 , . . . , ...

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Abstract

The invention provides an adaptive spatial steganographic method based on adjacent pixel difference. The method comprises the following two steps: embedding secret information and extracting the secret information. The method takes three continuous adjacent pixels in an image as an embedding unit and reaches the goal of hiding information by changing the value of the middle pixel in each unit. During information embedding, a steganographic algorithm always mains the size relationship of each pixel in the embedding unit, and adaptively adjusts the capacity of embedding information through a parameter according to the content of the image. Experiments show that the adaptive spatial steganographic method has higher safety and adaptive ability compared with the prior steganographic method based on pixel difference. Therefore, the adaptive spatial steganographic method has great practical significance to application fields such as covert communication and the like.

Description

technical field [0001] The invention belongs to the fields of multimedia information security and secret communication. It specifically relates to an airspace steganography method that can adaptively embed according to image content information and has high security performance. Background technique [0002] With the continuous popularization and development of digital multimedia and Internet technology, the research on information steganography technology has gradually attracted the attention of scientific researchers and military institutions. At present, the steganography methods of digital image data can be divided into spatial domain steganography and frequency domain steganography. [0003] Steganography based on PVD (Pixel-Value Differencing) is a typical spatial steganography method. Its main idea is to determine the amount of embedded secret information according to the difference between adjacent pixels of the image: the area with a large difference between adjac...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 骆伟祺黄方军黄继武
Owner SUN YAT SEN UNIV
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