一种离散余弦变换域抗同步攻击的音频水印算法

设计了一种抵抗同步攻击的音频水印方案。首先证 明音频均值是一个受TSM(time scale modification)操作稳定的特征量,然后利用音频均 值生成水印,并将其嵌入4级离散余弦变换(DCT)分解低频系数的统计 均值中。为避免同步攻击引起的水印同步结构连续偏移问题,提取水印过程中采用帧长不固 定的 可变帧长分帧方法；为实现水印的盲检测,水印的嵌入、提取通过量化的方法实现；为保证 水印的不可听性,利用信噪比(SNR)控制水印的嵌入强度。实验结果表明 ,提出的方法在抵抗常规信号处理操作的同时, 还能抵抗20%的TSM操作和1/10的抖动操作,具有很好的鲁棒性。

An anti-synchronization attack audio watermarking algorithm in DCT domain

An audio watermarking scheme is designed to resist synchronization attack.Firstly,it is poved that the audio mean is a stabl e feature parameter for the time scale modification (TSM) operation,and then audio mean is applied to embed the watermarking in the statistical mean of the low frequency decomposition coefficients 4-level discre te cosine transform (DCT);In order to avoiding t he continuous shifting of watermarking synchronization structure caused by means of synchronization attack s,the variable frame length dividing frame method is used in the process of extr acting watermark;In order to realizing watermarking blind detection,watermarking is embedded and extracted to audio by quantization method,and signal-to-noise ratio (SNR) is used to control the watermarking strength for watermarking inaudibilit y.The experimental results show that the proposed metho d is robust to the operation of conventional signal processing,and even can resist 20% TSM and 1/10dithering operation.