基于直方图平移的简易大容量可逆信息隐藏算法

Simple Large-capacity Reversible Information Hiding Algorithm Based on Histogram Shifting

为了提高隐秘图像质量和信息隐藏容量,并能在正确提取隐藏信息后无损恢复原始图像,文中提出了一种基于直方图平移的分块双向多位可逆信息隐藏算法。首先通过直方图寻找其最大的两个峰值点及其各自对应的零值点(或者是最小值点),然后对图像分块,在有峰值点的块中实现双向多位信息隐藏。为了提高隐藏图像的质量,优先选取靠近峰值点的零值点,同时在信息隐藏前需对待隐藏信息进行预处理。实验结果表明,该算法不仅可以实现可逆信息隐藏,而且隐藏容量高,隐藏图像质量好,算法简单。该方法可应用于图像认证和隐秘传输等相关领域。

In order to improve the hidden image quality and information hiding capacity,and to recover the original image without loss after hidden information is extracted correctly,a block bidirectional multi-bit reversible information hiding algorithm based on histogram translation was proposed.First,the maximum two peak points and their corresponding zero-value points(or minimum points)through the histogram are selected,and then the image is blocked,data is hidden in the blocked image with peak points.The pixels between both side of the maximum two peak points and a zero(or minimum point)are modified,with data hidden in both side of the maximum peak points of the blocked image.A peak point can hide multi-bits data.The experimental results show that this algorithm is both simple and able be used to hide reversible information,and that reversibility of information hiding is good and information hiding capacity is high.This algorithm can be applied to image authentication,secrete information transformation and the related area.