부산대학교 도서관

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. Keywords: data Hiding; Exploiting Modification Direction, switch map, Huffman code
1. Introduction Data hiding can embed secret data into meaningful cover media such as image, audio and video. The approach of least significant bit (LSB) replacement [1-3] is a common [...]