摘要： 针对二值图像修改痕迹明显的特点，提出一种失真较小的二值图像信息隐藏算法。给出翻转点选择标准，定义二值图像所有适合翻转的像素点集合。考虑视觉特性，提出可翻转像素点修改得分的计算方法，设定可翻转点选取的门限值，将含有可修改像素点的图像块视为隐藏消息的载体块。对二值图像进行分块，利用STC编码，在载体块序列中选择一条信息嵌入的最佳修改路径，实现信息的嵌入。实验结果表明，该隐藏算法能够减小载密图像的失真度，提高视觉隐蔽性，保持二值图像中L型的方差统计特性，抵抗相关的隐写检测。

关键词: 二值图像, 信息隐藏, 隐写编码, 图像失真, 可修改得分

Abstract: This paper presents a new information hiding algorithm used for binary image with a small distortion, aiming at the feature that the changing trace is obvious in binary image. The selection criteria of turning point is presented and the set of pixels suitable for turning is denoted. Considering the visual features, the method for computing the scores of the turning pixels is presented. An image block containing the turning pixel can be viewed as a cover block containing the hidden data after the threshold of choosing the turning point is set up. The binary image is divided into blocks, and the STC(Syndrome-trellis Codes) encoding is used to choose the optimal path in the sequence of cover blocks for hiding message. Experimental results show that the proposed algorithm can reduce the distortion of the cover image, and the stego image has good visual effect, while the statistical properties of the variance of L-type in a binary image can be maintained. Therefore, it can be effective against the related steganalysis.

Key words: binary image, information hiding, steganographic coding, image distortion, flippable score

中图分类号: 

• TP312