提出了一种JPEG图像的同步嵌入与加扰方案.首先对DC系数使用棋盘预测法进行预测,根据预测误差值将DC系数分为没有进行预测(NP)、进行预测但没有嵌入数据(PN)、进行预测且嵌入数据(PE)3类,再利用秘密数据替代PE部分系数值完成DC系数的嵌入加扰,最后对符合条件的AC系数的游程编码(run length coding,RLC)序列进行旋转,完成RLC序列的嵌入加扰.实验结果证实,该方案能保证高嵌入容量和低文件膨胀度,而且重构图像的SSIM值均大于0.996,PSNR值均大于50,在一定条件下能完全重构原始图像.%A synchronized data embedding-scrambling scheme in JPEG images is proposed in this paper.First,Checkerboard prediction method is used to predict the DC coefficient.According to the prediction error,the DC coefficient values are classified into three categories:not-predicted (NP),predicted but not embedded (PN),and predictedand-embedded (PE).Then,the PE is vacated to embed information while scrambling the DC coefficients.Finally,the eligible RLC (run length coding) pairs of AC coefficients are rotated to embed information.Experimental results confirmed that the method ensures the high payload and the low file expansion.The SSIM value of the reconstructed image is more than 0.996.The PSNR value of the reconstructed image is more than 50.And the original image can be reconstructed completely under certain conditions.
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