基于双声道能量差值的AAC音频零水印算法

AAC audio zero watermarking algorithm based on dual-channel energy difference

为对AAC音频进行版权保护,提出一种针对AAC压缩音频的零水印算法。根据双声道音频能量差值在加噪、重压缩、低通滤波等攻击下具有良好稳定性的特点,计算量化之前的改进离散余弦变换(MDCT)系数的能量,求取该双声道能量差值,将该能量差值作为特征,以此特征通过大津算法(OTSU)方法进行编码增加稳定性,将编码得到的二值序列与水印序列异或生成零水印。实验结果表明,该方法对加噪、重压缩、低通滤波等攻击具有良好的鲁棒性。

To protect the copyright of AAC audio,a zero watermarking algorithm for AAC audio compression was proposed.The energy difference of dual channel audio has good stability under the attacks of adding noise,recompression and low pass filtering,the energy of MDCT coefficients was calculated before quantization,and the energy difference of the dual channels was obtained.According to this feature of the energy difference,OTSU method was used to encode the feature to increase stability.The zero watermark sequence was generated by executing operation XOR for the binary feature sequence and the watermark sequence.Experimental results show that the proposed method has good robustness to the attacks such as noise,compression and low pass filtering.