基于排序和直方图修改的可逆信息隐藏方法

Reversible data hiding based on sorting and histogram modification

提出一种基于排序的差值直方图修改的可逆信息隐藏方法。首先,对图像分块;然后,采用按灰度值大小排序后的中值作为参考点,并和其余像素点做差,以产生更多的相同的值,使其差值直方图更紧凑、直方图的峰值点更大;最后,采用基于直方图修改的方法在差值中进行隐藏。实验表明,该方法不仅可以实现可逆信息隐藏,隐藏效果更好,并且嵌入量更高。为了提高嵌入量,进行了多层信息嵌入,并且在嵌入层数不同时采用不同的分块方式,提高了隐藏效果。分析了实验结果。

A reversible data hiding scheme is proposed based on sorting and histogram modification. The cover image is firstly divided into non-overlapped blocks,and the pixels in blocks are sorted.According to the sorting result,the medium value is selected as the reference value while calculating the difference values among all the pixels values in the block.By doing this,the histogram of difference values is more compact,and the peak point is larger.The reversible data hiding of histogram modification is used for embedding secret data.The experiments show that the proposed scheme is capable of hiding more secret data while maintaining imperceptible stego-image quality degradation.Furthermore the multilevel embedding is employed to achieve higher capacity,and the blocked mode is changed in the different embedding level for improving the stego-image quality,and the experimental results are analysed.