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 e...