一种修改JPEG图像量化表的信息隐藏方法
An Approach of Information Hiding Based on Adjusting JPEG Quantification Table
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摘要: 以JPEG图像为载体,探讨了一种修改JPEG图像量化表的信息隐藏方法。由于JPEG图像编码信息损失主要发生在量化过程,因此,首先通过计算JPEG图像量化后的DCT系数和反量化后的DCT系数之间的差异寻找信息隐藏的最佳位置;其次修改量化表相应的位置数值,将隐藏的信息嵌入到相应位置,使之与原始系数之间的差异最小,以保证JPEG图像信息损失最少。Abstract: An information hiding method based on adjusting the JPEG quantification table is proposed.First of all,the differences between the quantified DCT coefficients and the counter-quantification DCT coefficients of a JPEG image are calculated for seeking the best positions of hiding information.Secondly,the value of the JPEG quantification table at best position was adjusted,and the secret information was inserted at the responding position.Finally,the information hiding content of a JPEG image was discussed.
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