一种基于Arnold变换的音频数字水印算法

提出了一种新的音频数字水印算法。根据音频信号时域特征分析结论确定出若干个相对稳定的特征区域,然后对每个特征区域进行DCT变换,通过对DCT系数进行比较实现了水印信息的嵌入。水印信息是二值图像,在嵌入前使用Arnold变换对图像信息进行了加密。水印的提取不需要原始音频信号的参与,而且采用并行嵌入和统计检测的方法提高了水印性能。仿真试验证明了算法的有效性和数字水印的不可感知性。

An audio watermarking algorithm based on Arnold transform

A novel audio watermarking algorithm is proposed.At first,the character of audio is analyzed in the time domain to choose some steady high-energy local regions,and then each watermark bit is repeatedly embedded into all the selected regions by exchanging the corresponding DCT coefficient pair.The watermark image is scrambled by Arnold transform to increase the security and robustness of watermark.The watermark can be extracted without the original audio signal.The experimental results demonstrate the algorithm is practicable and imperceptible.