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Enhance embedding capacity for switch map based multi-group EMD data hiding

1 Department of Computer Science and Engineering, XI’AN University of Technology, XI’AN, China
2 Department of CSIE, National Dong Hwa University, Hualien, Taiwan

Special Issues: Security and Privacy Protection for Multimedia Information Processing and communication

Exploiting 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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© 2019 the Author(s), licensee AIMS Press. This is an open access article distributed under the terms of the Creative Commons Attribution Licese (http://creativecommons.org/licenses/by/4.0)

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