基于区块差值分布之彩色BMP图文件可回复信息隐藏法

Reversible Data Hiding Algorithm for Color BMP Image Based on Block Difference Histogram

提出一个基于区块差值分布之彩色BMP图文件可回复信息隐藏法,先将彩色BMP图档的像素切割成不重迭长宽各3个像素的区块,每个区块中用特定方式选择其中一个像素,计算其他8个像素和此像素的RGB颜色绝对差值,利用这些差值来产生分布图,在分布图中找出适合的峰点和零点,将峰点和零点内的区域向右位移1个颜色差值,就能将位形式的信息藏入峰点颜色差值的像素中,藏入信息的图文件仍能保持良好质量,肉眼无法察觉差异,经实验证明本研究提出的方法可隐藏大量信息并维持良好的图片质量。

This paper proposes a reversible data hiding algorithm for color BMP image that is based on the block difference histogram. The color BMP image is divided into non-overlapping 3 by 3 pixels blocks. In each block, a specified pixel is selected to calculate absolute differences between the RGB color value of the selected pixel and that of the other pixels. Then, these differences are used to generate a histogram and the block difference histogram shifting method is adopted to embed data. Experimental results reveal that the proposed method yields a high embedding capac-ity.