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DCT统计特性的变化及二次压缩前后的质量因子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JPEG二次压缩的新的检测方法——抖动模式,并给出了满足DCT直方图抖动模式的充分必要条件。实验证明,这种新的检测方法是有效的。
After JPEG double compressed, the DCT statistic of JPEG image will be changed, which is the focus in this paper. The distributions of DCT coefficients are changed with the double compression factors： Q1 and Q2. The difference of the distributions is analyzed in this paper. A new method-dithering pattern is proposed to detect double JPEG compression. Meanwhile, the necessary and sufficient conditions about dithering pattern are obtained. Experimental results show that this method is effective.
出处
《中国图象图形学报》
CSCD
北大核心
2006年第11期1619-1622,共4页
Journal of Image and Graphics
关键词
JPEG双压缩
质量因子
抖动模式
JPEG double compressing, quality factor, dithering pattern
