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中文摘要：
针对目前双重压缩研究的问题,提出一种确定初始矩阵的新方法（a method of calculating primary quanti-zation matrix of JPEG,简称CM）。在未知双重压缩系数大小关系的条件下,CM方法通过剪切JPEG图像的方式获得与原始图像近似的特性,然后再通过对这些特性进行分析来确定初始量化矩阵。实验结果表明,CM方法能够确定初始量化矩阵,它是一种非常有效的方法。
英文摘要：
For the problem of double compressed,this paper proposed a new method to calculate and estimate the primary quantization matrix of JPEG,called CM. CM could analyse and calculate the primary quantization matrix when didn＇t know big or small of the primary quantization matrix and secondary quantization matrix. By cropping JPEG,characteristics of the new image given is very similar to the original image. And then,analyzing these characteristics,CM may estimate primary quantization matrix. The results show that CM method is very efficient and it is a more better approach.
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