一种基于整数变换的数据隐藏新算法

A new data hiding algorithm based on integer transform

基于Harr小波变换(整数变换),提出了一种新型的差值扩展数据隐藏算法,传统的Tian算法遇到的问题是二重嵌入中用于变换的差值大幅减少,嵌入容量受到了很大制约,并且在固定的嵌入容量下Tian算法不得不选取较大的差值进行扩展,对图像质量造成较大破坏。所以提出了一种双重差值扩展算法(DDE算法),在二次嵌入过程中使用与第一次嵌入不同的差值选取办法,从而避免了二次嵌入时差值被破坏的缺陷,使得可供嵌入的差值(特别是较小差值)大大增加。与传统的Tian算法相比,该算法在相同的负载条件下显著提高图像质量。

A new difference expansion data hiding algorithm based on Harr wavelet （integer transform）is presented.The problem of traditional Tian algorithm is that the difference decrease rapidly in the second embeding ,so the payload is limited ,and the Tian algorithm have to use bigger difference to expansion under a certain embedding content,the image quality is destroyed severity.So a dobule difference expansion（DDE） algorithm is proposed to solve this problem,which uses a different difference pairing mode in the second embeding,so this algorithm can avoid the relativity of difference in the twice embedding,and the useful difference is increased sharply.Compared to the Tian algorithm,the DDE algorithm achieves better image quality under the same payload.