摘要
针对图像隐写软件对图像(JPEG格式)进行二次压缩的过程,提出将待检图片是否被二次压缩作为图像是否被隐写的特征之一。为了对JPEG二次压缩后的图像进行有效检测,通过研究JPEG图像经二次压缩后所引起的DCT统计特性的变化及二次压缩前后的量化表q1、q2对二次压缩后图像的DCT统计所引起的变化的分析,提出了针对不同q1、q2 JPEG二次压缩的检测方法。实验证明本文的检测方法是有效的。
Due to the stego image double compressed before embedding in some steganographic techniques, double compression could be one of the features of steganography. After JPEG double compressed, the DCT statistic of JPEG image will be changed, which is the focus of this paper. The distributions of DCT coefficients are changed with the double compression quantization tables q1 ,q2. The difference of the distributions is analyzed. The different detection methods are proposed based on different q1 ,q2 which are effectively proved by the experiments.
出处
《华东理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2007年第5期722-725,共4页
Journal of East China University of Science and Technology
关键词
隐写术
隐写分析
JPEG双压缩
直方图
steganography
steganalysis
JPEG double compressing
histogram
