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电子学报  2013 

DCT和DWT域音频水印幅值变化规律分析

DOI: 10.3969/j.issn.0372-2112.2013.06.023, PP. 1193-1197

Keywords: 音频水印,离散余弦变换,离散小波变换,混合域,可听噪声

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Abstract:

嵌入水印对音频信号波形的影响受到的关注不多.分析得出改变采样序列离散余弦变换(DiscreteCosineTransform,DCT)域某个交流系数时,逆DCT后幅值变化服从余弦曲线,改变离散小波变换(DiscreteWaveletTransform,DWT)域某个近似系数时,重构后采样序列幅值变化呈现为所选小波的尺度函数.并对在DWT-DCT混合域嵌入水印做了讨论.通过推导和实验,得到采样点的改变量与DCT域低频系数的改变量、DWT域近似系数的改变量及混合域低频系数的改变量成线性关系.所得结论有助于发现嵌入算法带给采样点序列的不连续变化而使含水印音频产生可听噪声,也有助于提高水印的嵌入效率.

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