基于量化索引调制的抗共谋指纹改进方案

摘要

在基于量化索引调制(QIM)嵌入技术的数字指纹系统中,量化步长越大,系统抗共谋攻击的性能越差.针对上述情况,提出一种改进的抗共谋指纹方案.在嵌入指纹前将随机抖动信号加入到宿主信号,由此增强指纹信号的连续性,提高系统的抗共谋攻击性能.实验结果表明,采用改进方案的QlM指纹系统检测率更高.%In digital fingerprinting system based on Quantization Index Modulation(QIM), higher the value of quantization step size is, worse the detection performance is. To resolve this problem, an improved QIM-based fingerprinting scheme is proposed to improve the continuity of fingerprinting signal and enhance the collusion resistance of fingerprinting system before fingerprinting imbedding by adding a random dither signal to the host signal. Simulation results show that the improved fingerprinting system has better detection probability than traditional QIM-based fingerprinting system.