基于图遍历的自适应调色板图像密写方案

Adaptive graph traversal-based steganographic scheme for palette images

提出了一种新的基于图遍历的自适应调色板图像密写方案。将调色板中各颜色视为图节点,利用颜色间的亮度差和欧氏距离,构建颜色图。应用图的遍历为颜色节点,分配秘密比特。嵌入秘密信息的过程中,利用相邻像素颜色间的相关性,建立自适应嵌入准则。对比实验结果表明,提出的密写方案具有较大的嵌入容量,并保持很好的图像质量,与其他的密写方案相比,提出的方案更能抵抗直方图特征函数(HCF)统计分析。

A novel adaptive graph traversal-based steganographic scheme for palette images is proposed. Each color in the palette is considered to be a graph node,and a color-graph is constructed by exploiting the difference of luminance and Euclid distance between any two colors. Assignment of secret bit for each color-node is completed according to traversal of a graph. During the data embedding,the adaptive rule is built by exploiting correlations among colors of the pixels. Comparative experimental results show that the proposed scheme can gain a larger capacity,maintain quite good image quality,and be more resistant to HCF attack,compared with some other steganographic schemes.