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Erschienen in:
2009 | OriginalPaper | Buchkapitel
Steganalysis Based on Difference Image
verfasst von : Yifeng Sun, Fenlin Liu, Bin Liu, Ping Wang
Erschienen in: Digital Watermarking
Verlag: Springer Berlin Heidelberg
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This paper presents a performance comparison between Harmsen’s method and a family of Steganalysis Method based on Difference Image (SMDI), in order to promote steganalysis theory. The theoretical analysis begins from the commonness of SMDI, and is focused on the assessment of the statistical change degree between cover and stego, showing that SMDI outperforms the Harmsen’s method. The paper also analyzes that the improvement owes to two aspects: the larger variance of stego-noise difference and the correlation of adjacent pixels utilized by SMDI. A new detector, which can use the correlation of adjacent pixels in all directions, is proposed by generalizing the definition of difference. Experiments show the better performance of the new detector.