基于标记矢量量化的多重音频数字水印算法

Multiple Audio Watermarking Algorithm Based on Labeled-VQ

提出一种基于矢量量化和DCT变换的多重音频数字水印算法。该算法将鲁棒水印和脆弱水印分别嵌入到载体音频信号中,同时完成版权保护和音频内容完整性认证的功能。鲁棒水印在进行码字标记的矢量量化过程中嵌入到DCT中频系数中,脆弱水印采用索引约束的方法嵌入到DCT高频系数中。鲁棒水印和脆弱水印都能实现盲提取。实验结果表明,本算法引入的失真较小,鲁棒水印可以抵抗大部分的攻击操作,同时脆弱水印可以实现对随机替换篡改的有效定位。

A novel multiple audio watermarking algorithm based on vector quantization technique and DCT transformation is proposed. To accomplish the purpose of copyright protection and content integrity authentication at the same time, the robust and fragile watermarks are both embedded into the carrier audio signal. The robust watermark is embedded into the middle frequency coefficients of DCT during the codeword labeled vector quantization process, and the fragile watermark is embedded into the high frequency DCT coefficients by using the index constrained method. Blind extraction can be achieved both for the robust and fragile watermarks. The simulation results indicate that the induced distortion by watermark embedding is small, and the robust watermark can resist to most of the common attacks. At the same time, the fragile watermark can accomplish the effective location to the random substitute falsify.