基于小波系数差值直方图平移的可逆数据隐藏

Reversible data hiding based on wavelet coefficient difference histogram shifting

针对传统差值直方图平移算法嵌入容量偏低、多重嵌入时图像质量严重下降等缺陷,提出一种基于整数小波系数差值直方图平移的彩色图像可逆数据隐藏算法。利用色彩分量间的相关性和小波系数间的关系减小差值,使差值直方图更加紧凑、峰值更大。采用双重嵌入方法提高嵌入容量,两次嵌入的像素值扩展方向相反,使得部分像素扩展量相互抵消,像素扩展量最大值为1,从而保证了含密图像的质量。实验结果表明,本文算法在保证图像质量的同时大幅提高嵌入容量,与其它同类算法相比,算法的整体性能更高。

To avoid the drawback of difference histogram shifting algorithm which has lower capacity and image quality in multi-embedding,a reversible data hiding algorithm for color images based on wavelet coefficient difference histogram shifting is proposed in this paper. This algorithm uses the correlation of color components and the relationship between wavelet coefficients to decrease difference. The histogram of difference is more compact, and the peak is larger. The embedding scheme makes use of dual-embed ding method to increase the embedding capacity, and uses the reverse direction to expand the pixel value. The maximum expansion is 1 ,and some expansions cancel out each other, so the stegcrimage quality is higher. Experimental results show that the embedding capacity and the quality of stego-image are significantly improved compared with other new or classical algorithms.