TITLE:
Information Hiding Method Based on Block DWT Sub-Band Feature Encoding
AUTHORS:
Qiudong SUN, Wenxin MA, Wenying YAN, Hong DAI
KEYWORDS:
Sub-Band Feature Encoding, Redundant Encoding, Visual Model, Discrete Wavelet Transformation, Information Hiding
JOURNAL NAME:
Journal of Software Engineering and Applications,
Vol.2 No.5,
December
28,
2009
ABSTRACT: For realizing of long text information hiding and covert communication, a binary watermark sequence was obtained firstly from a text file and encoded by a redundant encoding method. Then, two neighboring blocks were selected at each time from the Hilbert scanning sequence of carrier image blocks, and transformed by 1-level discrete wavelet transformation (DWT). And then the double block based JNDs (just noticeable difference) were calculated with a visual model. According to the different codes of each two watermark bits, the average values of two corresponding detail sub-bands were modified by using one of JNDs to hide information into carrier image. The experimental results show that the hidden information is invisible to human eyes, and the algorithm is robust to some common image processing operations. The conclusion is that the algorithm is effective and practical.