Journal of Applied Sciences ›› 2018, Vol. 36 ›› Issue (5): 819-825.doi: 10.3969/j.issn.0255-8297.2018.05.009

• Signal and Information Processing • Previous Articles     Next Articles

Asymmetric Distortion Function for Spatial Adaptive Steganography

WANG Zi-chi1, ZHANG Xin-peng1, QIN Chuan2   

  1. 1. School of Communication and Information Engineering, Shanghai University, Shanghai 200444, China;
    2. School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
  • Received:2017-09-17 Revised:2017-11-23 Online:2018-09-30 Published:2018-09-30

Abstract: This paper proposes a general method to distinguish the embedding cost for different polarity of embedding change for spatial images. Firstly, at the cost of distortion of pixel grayscale value, the original distortion function is improved. Then the improved distortion function is adjusted iteratively according to the modified pixels. The modification directions are gathered together after the original distortion function is optimized using the proposed method. Thus the stego images perform better undetectability. Experiment results show that the security performance of current popular steganographic methods is observably increased after incorporated the proposed method.

Key words: spatial images, polarity, steganography, distortion cost

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