基于自适应分块的彩色图像可逆信息隐藏算法

Color image reversible data hiding algorithm based on adaptive partitioning

目前彩色图像可逆信息隐藏(reversible data hiding,简称RDH)大多直接将灰度图像算法应用到彩色图像的各个通道上,未能充分利用彩色通道间的相关性.提出一种基于自适应分块的彩色图像RDH算法.首先,为了充分利用通道间的相关性,提出将彩色图像进行自适应分块;其次,为了更好地利用平滑区域,提出基于通道特性的嵌入容量分配原则以保证在平滑区域嵌入更多的信息;最后,为了提高彩色图像视觉质量,提出一种符合人眼视觉特性的B-R-G嵌入原则,优先选择对人眼视觉影响较小的通道进行嵌入.实验结果表明,在不同的嵌入容量下,该文方法载密图像的峰值信噪比(peak signal-to-noise ratio,简称PSNR)明显优于所比较的彩色图像RDH方法.

To solve the problem that most of the current reversible data hiding(RDH)of color images directly apply the grayscale image algorithm to each channel of the color image,and cannot fully utilize the correlation between the color channels.This paper proposed a color image reversible data hiding algorithm based on adaptive partitioning.Firstly,in order to make full use of the correlation between the channels,the color image was divided into adaptive blocks,and the pixels of the three channels R,G and B were taken into account.Secondly,in order to make better use of the smooth region,an embedding capacity allocation principle based on channel characteristics was proposed to ensure that more information was embedded in the smooth region.Finally,in order to improve the visual quality of color image,a B-R-G embedding principle was proposed,which accorded with the visual quality of human eyes,and chose the channel which had less impact on the visual quality of human eyes.Experimental results showed that under different embedding capacities,the peak signal-to-noise ratio(PSNR)of the marked image using the proposed method was significantly better than that of the color image RDH method.