Abstract: This paper proposes a novel steganalysis algorithm based on pattern analysis for binary text images.The paper proposes the idea of image “Pattern” on the bases of deep investigating all kinds of information hiding and steganalysis algorithms.And divides the patterns into three categories according to human visual effect degree for flipping the center pixel of the pattern，establishes the best embedding pattern storehouse for binary images.Then proposes a steganalysis algorithm based on pattern analysis，with statistically analyzed the changing characteristics of patterns before and after embedding message in binary text image.The experiments prove the algorithm is an effective steganalysis algorithm for detecting secret message in binary text images.

Key words: pattern analysis, binary image, steganalysis

摘要： 提出了一种基于模式分析的二值文本图像隐写分析算法。在深入研究当前国内外二值图像信息隐藏和隐写分析算法的基础上，提出了图像“模式”的概念，并将图像模式按照修改其中心像素对人体视觉的影响程度分成三类，建立了二值图像最佳嵌入位置模式库；通过分析二值文本图像的模式在嵌入信息前后的变化特征，提出了基于模式分析的二值文本图像隐写分析算法。实验证明该算法是一种性能较佳的二值文本图像隐写分析算法。

关键词: 模式分析, 文本图像, 隐写分析