面向空气信道传播的DCT域音频数字水印算法

摘要

An audio sonic watermarking algorithm was proposed based on double DCT transform. The low-frequency coefficients after the first DCT transform were chosen for the second DCT transform. Using the method of modifying the coefficients in the double DCT domain, watermarking was embedded and in large quantities. Experimental results indicate that the proposed algorithm has a good hidden effect, and it has very good robustness, especially to 30% resample and MP3 compression attacks. Moreover, it can be applied to transmitting situation via air channel, with bit error ranging from 1. 2% to 6. 5%.%提出了一种基于双DCT变换的音频数字水印算法,通过选取首次DCT变换后的DCT域低频系数,对其再次进行DCT变换,得到双DCT域系数.通过修改双DCT域系数,实现水印的嵌入,并且嵌入量较大.实验结果显示,该算法隐藏效果好,对30％的重采样攻击和MP3压缩攻击具有很好的鲁棒性.而且,该算法能够适用于面向空气信道传播的场景,误码率可控制在1.2％～6.5％之间.