Abstract: 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.

Key words: digital fingerprinting system, Gauss fingerprint, Quantization Index Modulation(QIM), anti-collusion, distortion evaluation

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QIM指纹系统检测率更高。

关键词: 数字指纹系统, 高斯指纹, 量化索引调制, 抗共谋, 失真估计

CLC Number: 

• TP309.2