基于预测模式相关性的HEVC隐写检测算法

Steganography detection algorithm based on the prediction mode correlation for HEVC

提出了一种基于预测模式相关性的高效视频编码(HEVC)隐写检测方法。首先定义帧内预测模式相关性的概念;然后通过实验,分析隐写前后帧内4×4亮度块中35种帧内预测模式的相关性统计数据的变化情况;最后选择35个隐写前后变化较大的相关性数据构成视频特征,并利用支持向量机(SVM)分类器进行隐写检测。实验表明,本文检测方法的特征维数低,计算复杂度小,对修改帧内预测模式的隐写算法具有良好的检测效果。

At present,information hiding algorithm based on modified intra-prediction mode has been pro- posed in the H. 265/HEVC. The steganographic algorithm embeds secret information by modifying the intra-prediction mode. But there is no steganalysis method for H. 265/HEVC from the available litera- ture. This paper proposes a steganalysis method based on the correlation of intra-predietion mode. The concept of the correlation of intra-prediction mode is defined firstly, then we analyze the correlation of 35 kinds of intra-prediction modes in the 4 X 4 luma block before and after information hiding through abun- dant experimenl data. 35 correlation data which change a lot after information hiding are chosen to con- stitute the video features. Lastly, the video features will be sent to support vector machine （SVM） classi- fier to finish the detection of information hiding. Experimental results demonstrate that the algorithm has good detection effect while the feature dimension is low, and the computational complexity is small.