In recent years, the EMD-based steganographic method has become more and more popular because of its easy implementation and high security. However, it had two shortcomings: One is the secret data must convert into non-binary numeral system, and the other is low payload. In order to overcome these shortcomings, some studies used the hexagon (or octagon)-shaped reference matrix instead of the extraction function. In this study, a high payload EMD-based steganographic method is proposed, a combined mapping matrix is generated by two extraction functions in the embedding and extracting procedure. With the diversity of the definition of these two extraction functions, the proposed method achieves high security. The experimental results show that the proposed method achieves high payload and the quality of stego-image satisfies the human vision system sensitivity.

近年来，基于EMD的隐写方法因其易于实施和高度安全性而变得越来越流行。但是，它有两个缺点：一个是秘密数据必须转换为非二进制数字系统，另一个是低有效载荷。为了克服这些缺点，一些研究使用了六边形（或八边形）形状的参考矩阵来代替提取函数。本文提出了一种基于EMD的高有效载荷隐写方法，在嵌入和提取过程中，通过两个提取函数生成一个组合映射矩阵。由于这两种提取函数定义的多样性，所提出的方法具有很高的安全性。