摘要
提出了一种无损的二值图像信息隐藏算法。考虑二值图像中像素与其邻域内相邻像素的连通性和光滑性,提出一种可修改像素的选择标准,进而构造出一条可供秘密信息隐藏的载体序列;根据待嵌秘密信息的长度选择合适长度的载体序列作为信息隐藏的所用载体序列;利用算术编码对所用载体序列进行无损压缩,得到隐藏信息的可用冗余空间;通过比特控制的方法选择信息嵌入方式,减少嵌入过程中对原始图像的修改。实验结果表明,该算法不仅能够对原始图像进行无损还原,载密图像视觉效果好,而且由于选择最小的修改方式实现信息的嵌入,减小了图像整体的失真,满足实际应用的需求。
This paper presents a lossless data hiding algorithm for binary images. Based on the con-nectivity and smoothness of a binary image pixel and its neighborhood, selection criteria of turning points are presented. Following these selection criteria, a carrier sequence for message embedding can be constructed. The carrier sequence length depends on the length of secret information to be embedded, and arithmetic coding is applied to ensure lossless compression of the carrier sequence to obtain redundant space for the hidden information. Bit control method is employed to reduce the modification of original images caused by information embedding. Experiments indicate that the pro- posed algorithm can ensure lossless recovery of the original image and better visual effects of the ste-goimage. Since information is embedded with least modification, image distortion is minimized, thus making the algorithm promising for real-world application.
出处
《信息工程大学学报》
2012年第4期421-425,共5页
Journal of Information Engineering University
基金
国家自然科学基金资助项目(61170234)
关键词
二值图像
信息隐藏
算术编码
隐藏容量
图像失真
binary image
information hiding
arithmetic coding
hiding capacity
image distortion
