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- Yan-Xiao Liu, Ching-Nung Yang, and Qin-Dong Sun.
- Department of Computer Science and Engineering, XI'AN University of Technology, XI'AN, China.
- Math Biosci Eng. 2019 Apr 18; 16 (5): 3382-3392.
AbstractExploiting Modification Direction (EMD) based data hiding achieves good stego-image quality and high security level. Recently, a section-wise EMD was proposed to enhance the embedding capacity of EMD. Later, Wang et al. introduced a switch map based multi-group EMD to further improve the embedding capacity. However, by a detail observation on the switch map in Wang et al.'s scheme, we find that more codewords with longer code-length can be put into the switch map. In this paper, we build a new switch map by Huffman code, and construct an enhanced multi-group EMD using Huffman code based switch map. Our scheme has higher embedding capacity than Wang et al.'s scheme and other EMD based data hiding methods.
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