同步数字音频盲水印

提出了一种基于离散小波变换的同步数字音频盲水印算法。该算法利用同步信号定位水印的嵌入位置,以提高水印提取的正确率,同时将分段信息加入水印,采用冗余编码,增强了纠错能力。水印嵌入时采用基于模运算的量化方法,以满足水印的盲检测。同步信号嵌入时域,以提高搜索效率,水印隐藏在离散小波变换域的低频系数中,以达到较好的鲁棒性。检测水印时不需要原始音频,水印数据在嵌入之前先加密,没有正确的密钥,无法正确恢复水印。

Algorithm of Blind Synchronous Digital Audio Watermarking

An algorithm of blind synchronous digital audio watermarking based on Discrete Wavelet Transform(DWT)is proposed.In this algorithm,synchronous signals are employed to position the embedded watermarking so as to improve the accuracy of watermarking extraction,the error-correction ability is strengthened by joining fragmentation information into the watermarking and adopting redundancy code.Mode calculation is adopted in embedding the watermarking so as to satisfy the demand of blind detection.Search efficiency is improved by embedding synchronous signals into time domain.Better robustness is achieved by hiding the watermarking into the low frequency coefficient of DWT domain.Detection of the watermarking can be conducted without original audio frequency.Watermarking data are encrypted before embedding so that the watermarking can not be resumed correctly without corresponding key.