适用于灰度级信号的数据嵌入方法

Methods for Embedding Data in Gray-scale Signals

针对灰阶信号载体,研究了高效数据嵌入方法。利用二元隐写编码和湿纸编码,对±1隐写提出了双层嵌入方法,证明了只要二元隐写码达到二元隐写的嵌入率上界,则对应的双层嵌入可达到±1隐写的嵌入率上界。进一步对±2隐写提出了三层嵌入方法,分析了三层嵌入与嵌入率理论上界的距离,分析结果表明,将双层嵌入和三层嵌入组合即可得到近似最优的±2隐写方法。

Efficient methods for embedding data in gray-scale signals are presented. By using binary steganographic codes and wet paper codes, a ＂double-layered＂ embedding scheme for ±1 steganography is proposed. It is proved out that the corresponding ＂double-layered＂ embedding can achieve the upper bound of ± 1 steganography if the bianry stego-code reaches the upper bound on embedding rate of binary steganography. A ＂triple-layered＂ embedding scheme for ± 2 steganography is presented. The distance between the ＂triple-layered＂ embedding and the upper bound is analysed. The results show that the near optimal embedding schemes for ± 2 steganography can be obtained by combining ＂double-layered＂ and ＂triple-layered＂ embedding methods.