Analysis Against the Layer-Wise Steganographic Method Based on Wavelet Contrast and LSB
In the Layer-Wise steganographic method based on wavelet contrast and Least-Significant-Bit(LSB),the number of bit-plane embedded is decided by wavelet contrast,and secret information is embedded by the layer-wise model.The steganographic method can provide large embedding capacity and good imperceptibility.Aimed at this steganographic method,this paper visually analyzes steganographic actions by the methods in graph theory.Two feature statistics are defined based upon the histogram of the image under investigation.It is proved that there are linear relationships and different ratio relationships between the two feature statistics and the embedding rate.Then,a new steganalytic method is proposed.Theory analysis and experimental results show that our steganalytic method can not only announce the presence of hidden information,but also provide a approximative estimation of the embedding capacity.The steganalytic technique proposed in this paper is also useful to against other Layer-Wise steganographic methods.