为实现敏感图像的大容量可逆信息隐藏，提出一种基于图像相邻像素差值的大容量无损隐藏算法。通过将图像分块，对每个分块按照不同的扫描顺序计算差值，对差值序列进行比较，选取最优扫描顺序生成的差值直方图。从差值直方图中选取2个最大峰值点，每个峰值点选取最近的多个零值点，在峰值像素点插入多位秘密信息，从而实现图像大容量的可逆信息隐藏。仿真结果表明，该算法能根据不同分块图像的像素分布动态选择最优扫描顺序，且利用双峰值多零点嵌入，在嵌入隐秘信息后的峰值信噪比相差不大的情况下，可大幅提高隐写容量。%In order to achieve high capacity reversible sensitive image information hiding,this paper presents a lossless hiding algorithm of high capacity based on the difference between adjacent pixels for image. By the image block, and difference value of each block is calculated by different scanning order,choosing the difference value histogram of best scan order by comparing difference value sequence. Select the two largest peak points from the differerce histogram,and the nearest multiple zero points in each peak point,and insert several bit secret information in pixel of peak point,which achieves high capacity reversible image lnformation hiding. The results of simulation experiment show that the algorithm can select the best scan order by pixels distribution of each block image dynamically and using two peaks and multiple zero to embed secrets. It improves capacity of embedding secret information greatly, besides PSNR is ideal after embedding secret information.
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