基于像素对匹配的高载荷隐写算法

信息隐写算法的终极目标是嵌入尽可能多的秘密信息而不向宿主载体中引入任何可检测到的失真或者畸变. 然而, 隐藏质量和隐藏载荷二者往往是此消彼长互相矛盾的, 因此人们一般根据不同的应用需求而有所权衡和侧重. 本文提出了一种基于像素对匹配的灰度图像数据隐写算法, 用一组简单的函数引导宿主像素的修改和秘密数据的提取, 即可实现每对宿主像素每次隐藏两个9进制秘密数据. 实验结果表明, 该隐写算法隐藏载荷能达到3.1699比特每像素 (bpp), 此结果远远超过之前已发表的相关工作成果; 而在隐藏质量上, 该隐写算法能够保持较好的视觉系统的不可感知性和统计上的不可检测性.

Data hiding algorithm with high payload based on pixel pair matching

The ultimate goal of a steganography algorithm is to carry as many bits as possible without introducing any detectable artifact into the cover object. However, embedding quality and payload have an antagonistic relationship. Then, people often make a tradeoff between them depending on their different desires. In this paper, a new steganography algorithm for grayscale images with large payload and acceptable visual effect is proposed. We use a group of functions to guide cover pixel pairs' modification and imply two secret digits base-9 numeral system one time. From the experimental results, the embedding capacity of the proposed algorithm achieves 3.1699 bit per pixel, which is much larger than that of the published works, while the visual quality of stego images is acceptable too.