混合进制嵌入的调色板图像无损信息隐藏  

Lossless Data Hiding in Palette Images Based on Mix-ary Codes

作　　者：吕金鹏[1] 梁海华[1] 张新鹏[1] 

机构地区：[1]上海大学通信与信息工程学院,上海200444

出　　处：《应用科学学报》2015年第6期637-643,共7页Journal of Applied Sciences

基　　金：国家自然科学基金(No.61472235)资助

摘　　要：提出了一种基于混合进制的调色板图像无损信息隐藏方法.首先根据索引分布,区分有效索引与冗余索引.在调色板中分配若干冗余索引指向同一有效索引的颜色,使相同颜色的不同索引值承载不同的秘密信息,用于无损信息隐藏.用动态规划方法产生最大嵌入量下的冗余索引分配方案.不同颜色承载的秘密信息为不同进制秘密数字.该方法中嵌入机制并不影响原始图像内容.实验表明,与以往方法相比,该方法提高了数据嵌入量,医学图像尤为显著.This paper proposes a lossless data hiding method in palette images based on mix-axy codes. According to the distributionof indices, the indices axe divided into effective indices and redundant indices. In the palette a certain number of redundant indices are mapped to the color of an effective index. Then the indices mapping to the same color stand for different secret digits in order to embed extra data losslessly. A dynamic programming algorithm is used to find the best allocation for redundant indices to achieve the highest embedding capacity. Embedded data subsets carried by different colors axe different notational sequences. The data embedding operation does not affect the original image.Experiments showthat themethod has higher embedding capacity than previous methods, especially for medical images.

关 键 词：无损信息隐藏 调色板图像 混合进制 动态规划 

分 类 号：TN911.73[电子电信—通信与信息系统]