JPEG二次压缩的分析与检测
摘 要
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离散余弦变换（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。实验结果表明，该检测方法是有效的。
关键词
The Analysis and Detection of Double JPEG Compression
() Abstract
To assess images applied with JPEG double compressed，the DCT statistic of the JPEG image will be changed，which is the focus in this paper.The distributions of DCT coefficients are varied with the double compression quantization tables: q1，q2.The difference of the distributions is analyzed in this paper.The different detection methods are proposed based on different q1，q2，which are effective proved by the experiments in this paper.
Keywords
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