一种基于小波变换的同步音频水印算法

提出了一种基于小波变换的同步音频水印算法.该算法具有以下特点:(1)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.同步信号嵌入时域,用于提高搜索效率;同时又再次嵌入在小波变换域,用于提高其正确性.(2)根据音频的局部相关特性自适应确定量化步长,并将水印信息量化嵌入到小波变换域的低频系数中.仿真实验表明:该同步自适应音频水印算法不仅具有较好的透明性,而且对诸如低通滤波、有损压缩、重采样等攻击均具有较好的鲁棒性.

A Synchronous Audio Watermarking Algorithm Based on Wavelet Transform

A synchronous audio watermarking algorithm based on wavelet transform is presented in this paper.The features of the proposed algorithm are as follows:(1) Synchronous signals are employed to position the watermarking so as to improve the accuracy of watermarking extraction,searching efficiency is improved by embedding synchronous signals into time domain,it also embed the synchronous signals into the high frequency coefficient of wavelet domain.(2) The watermark is embedded into the low frequency components by adaptive quantization according to the local audio characteristics.Experimental results show that the proposed watermarking scheme is inaudible and robust against various signal processing such as low pass filtering,loss compression,and re-sampling.