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Electronics and Telecommunications Research Institute (한국전자통신연구원)
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A Model-Based Image Steganography Method Using Watson's Visual Model

  • Fakhredanesh, Mohammad (Department of Computer Engineering and Information Technology, Amirkabir University of Technology) ;
  • Safabakhsh, Reza (Department of Computer Engineering and Information Technology, Amirkabir University of Technology) ;
  • Rahmati, Mohammad (Department of Computer Engineering and Information Technology, Amirkabir University of Technology)
  • Received : 2013.02.18
  • Accepted : 2013.11.05
  • Published : 2014.06.01
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Abstract

This paper presents a model-based image steganography method based on Watson's visual model. Model-based steganography assumes a model for cover image statistics. This approach, however, has some weaknesses, including perceptual detectability. We propose to use Watson's visual model to improve perceptual undetectability of model-based steganography. The proposed method prevents visually perceptible changes during embedding. First, the maximum acceptable change in each discrete cosine transform coefficient is extracted based on Watson's visual model. Then, a model is fitted to a low-precision histogram of such coefficients and the message bits are encoded to this model. Finally, the encoded message bits are embedded in those coefficients whose maximum possible changes are visually imperceptible. Experimental results show that changes resulting from the proposed method are perceptually undetectable, whereas model-based steganography retains perceptually detectable changes. This perceptual undetectability is achieved while the perceptual quality - based on the structural similarity measure - and the security - based on two steganalysis methods - do not show any significant changes.

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References

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