基于量化索引调制的抗共谋指纹改进方案

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QIM指纹系统检测率更高。

Improved Anti-collusion Fingerprinting Scheme Based on Quantization Index Modulation

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.