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Reversible data hiding method based on pixel grouping strategy

A data hiding and grouping strategy technology, applied in image data processing, image data processing, instruments, etc., can solve problems such as poor security, abnormal gray histogram of dense images, difficulty in resisting steganalysis methods, etc., and achieve good vision effect, good concealment effect

Inactive Publication Date: 2010-03-10
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] When the above existing technologies are implemented, it is necessary to modify the gray histogram of the carrier data, which will cause an abnormal gray histogram of the dense image, and it is difficult to resist the steganalysis method based on the histogram, so the security is poor

Method used

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  • Reversible data hiding method based on pixel grouping strategy
  • Reversible data hiding method based on pixel grouping strategy
  • Reversible data hiding method based on pixel grouping strategy

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Embodiment Construction

[0035] A preferred embodiment of the present invention is described in detail as follows:

[0036] The following describes the process of information hiding, data extraction, and image restoration in this embodiment in conjunction with the accompanying drawings:

[0037] The original carrier image is usually relatively large. In order to illustrate how the present invention works, a Man image with a size of 512×512 is used as an example for illustration below. For the sake of simplicity, only the cover image block whose internal size is 6×18 is used for illustration. Such as figure 2 As shown, the six pixel points p(i, j), p(i+1, j), p(i+1, j+1), p(i, j+1), p(i , j+2) and p(i+1, j+2) are grouped by every three adjacent pixels, that is, p(i, j), p(i+1, j), p( i+1, j+1) is the first group, and p(i, j+1), p(i, j+2) and p(i+1, j+2) are the second group. Assuming that the corresponding gray value of 108 pixels is image 3 shown.

[0038] see figure 1 , the operating procedu...

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Abstract

The invention relates to a reversible data hiding method based on a pixel grouping strategy, comprising the steps of: a transmitting party dividing every three adjoining pixels of carrier image into one group, marking whether the group is an embedded pixel group by utilizing the absolute value of the difference value among the pixels, ensuring one group characteristic bit for the each embedded pixel group; compressing the marked group characteristic bit to generate redundancy space to carry additional secret information by utilizing the characteristic that the adjoining pixel groups frequentlytrend to be consistent, and simultaneously embedding the secret data and the data for resuming the image into the pixel groups capable of being embedded with the switch operation of the pixel gray value in the pixel group; and a receiving party judging whether the pixel group is loaded with the data bit according to the pixel grouping with the same key and the absolute value of the pixel difference value in the group, determining the secret bit loaded by judging the grouping characteristic of the pixel group loaded with the data bit and resuming an original image with uncompressed characteristic. The method has higher visual hiding performance and statistics hiding performance.

Description

technical field [0001] The invention relates to a method for adjusting pixel gray value by using signal processing, mathematical statistics and computer technology so as to carry out lossless information hiding in digital images. Background technique [0002] Information hiding is the embedding of additional data in digital multimedia products, which can be used as digital watermarks to protect the copyright of carrier products, and can also be used for covert communication to avoid the attention of third parties. At present, most of the information hiding methods will cause more or less influence on the carrier information, and if the receiver can extract the secret data and restore the original carrier without error, it is called reversible (or lossless) information hiding, which can be used for Medical images, military images and other carriers that require high precision. [0003] Existing methods for reversible data hiding in digital images have a common feature, which...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 刘焕张新鹏廖贵龙张颖春王朔中魏为民
Owner SHANGHAI UNIV
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