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.
WANG Zi-chi, ZHANG Xin-peng, QIN Chuan
. Asymmetric Distortion Function for Spatial Adaptive Steganography[J]. Journal of Applied Sciences, 2018
, 36(5)
: 819
-825
.
DOI: 10.3969/j.issn.0255-8297.2018.05.009
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