DCT域音频水印:水印算法和不可感知性测度

针对音频信号,提出了一种水印算法,该算法利用DCT频谱中的DC直流系数数据正负性不易改变的特性来嵌入水印信息,通过实验结果说明该水印算法可以在鲁棒性与不可感知性之间达到平衡.另外,提出了一种结合心理声学模型的客观评价含水印信号失真度的方法,通过实验结果和理论上的分析都说明这种不可感知性的测度可以体现人类听觉的主观特性,是一种比较合适的客观评价方法.

Audio Watermarking in DCT Domain:Algorithm and Measurement of Imperceptibility

An audio watermarking algorithm is presented.Robustness of the algorithm is based on the steady positive-negative sign of the DC coefficient in DCT domain.The result of simulation indicates that the algorithm has achieved balance between robustness and imperceptibility.At the same time,an objective measurement associated with psychoacoustic model for measuring the distortion of watermarked audio signal is presented in this paper.The result of experiment and theory analysis indicate that the measurement of imperceptibility matching the human auditory characteristics is an appropriate objective evaluating method.