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Method and apparatus for analyzing JPEG steganographic image

An image and steganography technology, applied in image data processing, image data processing, instruments, etc., can solve the problems of high feature dimension and low detection accuracy, so as to reduce scanning errors and solve the effect of low detection accuracy.

Inactive Publication Date: 2018-03-23
ENG UNIV OF THE CHINESE PEOPLES ARMED POLICE FORCE
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for analyzing JPEG steganographic images; by utilizing the correlation of DCT coefficients to analyze JPEG steganographic images, the low detection accuracy and feature dimensionality of existing JPEG steganographic image analysis are solved. high number problem

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  • Method and apparatus for analyzing JPEG steganographic image

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Embodiment Construction

[0031] Below in conjunction with specific embodiment the present invention is described in further detail:

[0032] The invention provides a method for analyzing a JPEG steganographic image, comprising the following steps:

[0033] Step 1, input a JPEG steganographic image, perform DCT coefficient matrix on the image, and obtain the DCT coefficient matrix J of the image; suppose the size of the JPEG steganographic image is M×N, and its DCT coefficient matrix is ​​J, then the matrix contains 8×8 sub-blocks.

[0034] Step 2, perform row scan, column scan, Hilbert curve scan and zigzag scan on matrix J to obtain the scan mode that has the greatest influence on the inter-block and intra-block correlation of DCT coefficients, the specific method is:

[0035] Firstly, column scanning and Hilbert curve scanning are performed on the 8×8 sub-blocks in the DCT coefficient matrix J respectively, and each 8×8 sub-block is arranged horizontally in sequence, and two 8×(8n B ) coefficient...

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Abstract

The invention discloses a method and an apparatus for analyzing a JPEG steganographic image. The method comprises steps of inputting a JPEG steganographic image, performing DCT coefficient matrixing of the image to obtain a DCT coefficient matrix J of the image, dividing the matrix J into a plurality of 8*8 sub-blocks, then performing row scanning, column scanning, Hilbert curve scanning and zigzag scanning to obtain a scanning mode that has the greatest influence on the inter-block and intra-block correlation of DCT coefficients; sequentially scanning the sub-blocks of the matrix, taking theabsolute values of the sub-block coefficients of the matrix J to obtain a coefficient matrix Jcc, and extracting the features of the coefficient matrix; and classifying the extracted features using anintegrated classifier to obtain a classification result. By using the correlation of the DCT coefficients to analyze the JPEG steganographic image, the problems that the existing JPEG steganalysis methods are low in detection accuracy and high in feature dimension are solved.

Description

technical field [0001] The invention belongs to the technical field of image information security, and relates to a method for analyzing a JPEG steganographic image and a device for analyzing a JPEG steganographic image. Background technique [0002] At present, the analysis methods for JPEG steganographic images in the prior art are mainly through extracting the characteristics of the image, and then performing steganographic analysis on it. The histogram feature, the feature of the sum of the jump variables along the 8×8 block boundary in the air domain, the variance feature of the quantized DCT coefficients in the 8×8 block, and the co-occurrence matrix feature of the DCT coefficients between blocks, finally get the 274-dimensional PEV feature, which can Realize the steganography of the image, and can be detected by nsF5, MB2, PQ, YASS; 2. The Cartesian product of the original image feature and the calibration image feature is used as the feature, and finally the 548-dime...

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Application Information

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IPC IPC(8): G06K9/62G06T1/00
CPCG06T1/0021G06F18/241
Inventor 雷雨
Owner ENG UNIV OF THE CHINESE PEOPLES ARMED POLICE FORCE