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基于混叠DCT频域灰度级盲水印多重嵌入算法

DOI: 10.11834/jig.200608183

Keywords: 数字盲水印,扩展频谱,DCT频域,交流系数,多数字基底,JND门限

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Abstract:

基于扩展频谱通信技术,对宿主图像的频域进行2维DCT变换,采用保持图像亮度的JND(justnoticeabledistortion)门限值和多数字基底对宿主图像DCT频域进行选块,对中频分量的DCT交流系数分组嵌入水印比特,以随机二值序列对高低频分量的DCT系数的水印比特嵌入进行控制,使多个数字盲水印信号载波传输于混叠的DCT频带。该算法可预估水印嵌入量,提取水印无需宿主图像和水印图像,仿真测试实例表明,该算法能有效抵抗滤波、加噪、剪切、JPEG有损压缩,具有较强的顽健性和鲁棒性。

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