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Halftone image steganalysis method

A steganalysis and half-tone technology, applied in image data processing, image data processing, instruments, etc., can solve the problems of difficult selection of more effective features and low feature dimensions, so as to reduce feature dimensions and improve accuracy Effect

Active Publication Date: 2019-12-27
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention overcomes the technical defect that it is difficult to select pattern blocks containing more effective features and low feature dimensions in the existing halftone image steganalysis, Provide a halftone image steganalysis method

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  • Halftone image steganalysis method
  • Halftone image steganalysis method

Examples

Experimental program
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Embodiment 1

[0037] like figure 1 As shown, a halftone image steganalysis method includes the following steps:

[0038] S1: Use the simulated embedding method to construct M steganographic images, and obtain a simulated steganographic image dataset, which contains 2M images;

[0039] S2: Determine the size of the pattern block, count the histogram features of the pattern blocks of each picture in the simulated steganographic image data set, and obtain the histogram feature space of the pattern block, with a total of 65536 dimensions;

[0040] S3: According to the histogram feature space of the pattern block, perform dimensionality reduction on all image features and construct a transformation matrix;

[0041] S4: Construct a training set from the data set, extract the histogram feature of the image pattern block of the training set, use the transformation matrix to calculate the feature vector of the training set, and input it into the SVM to train the analysis model;

[0042] S5: Constr...

Embodiment 2

[0045] More specifically, on the basis of Embodiment 1, in the step S1, the simulated embedding is to traverse each pixel in the image by setting a flip probability p, and randomly select a value q (0≤q ≤1), if q≥p, the pixel will not be flipped, otherwise, the pixel will be flipped. Finally, a simulated steganographic image data set D can be obtained, which contains a total of 2M pictures.

[0046]In the specific implementation process, the data source of the image is the BOSSBase 1.01 data set, which contains 10,000 grayscale images, which are converted into halftone images using error diffusion, and M images are randomly selected from them to construct simulated embedded data. Set, M is 5000, q=1 / 32.

[0047] More specifically, the step S2 specifically includes the following steps:

[0048] S21: Select a 4*4 pattern block size, calculate the image 4*4 pattern block histogram feature, in the halftone image, there are 2 4*4 pattern blocks 16 A mode, numbering different mod...

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Abstract

The invention provides a halftone image steganalysis method, which comprises the following steps: constructing a steganography picture to obtain a simulated steganography image data set; determining the size of a mode block, and counting histogram features of the mode block of each picture in the simulated steganography image data set; according to the histogram feature space of the mode block, carrying out dimension reduction on all image features and constructing a transformation matrix; constructing a training set and a test set from the data set, extracting histogram features of image modeblocks of the training set and the test set, calculating feature vectors of the training set by utilizing a transformation matrix, and inputting the feature vectors into an SVM to train an analysis model; and inputting the feature vector of the test set into a trained analysis model to complete the analysis of image steganography. According to the image steganalysis method provided by the invention, the mode block with the proper size is selected, PCA is adopted for dimension reduction, main steganography feature components are extracted, the feature dimension is reduced, more effective features are maintained, and thus the detection accuracy is improved.

Description

technical field [0001] The present invention relates to the technical field of multimedia information security, and more specifically, to a halftone image steganalysis method. Background technique [0002] With the rapid development of network technology, various pictures are transmitted on the network. Image steganography can slightly modify the image and embed information to carry out covert communication. Criminals may use this method to carry out covert communication and transmit bad information on the network. If the transmission of pictures is not supervised, this will be a huge security hole. For different types of images, the method of steganography will be different, and the method of steganalysis will also be different accordingly. However, halftone images may still be used for communication on the Internet. Therefore, from the perspective of security, for Steganalysis of halftone images is still very necessary and has certain significance for cyberspace security....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00G06K9/46G06K9/62
CPCG06T1/0021G06V10/50G06F18/2135G06F18/2411
Inventor 卢伟曾令雯
Owner SUN YAT SEN UNIV
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