计算机工程与应用
計算機工程與應用
계산궤공정여응용
COMPUTER ENGINEERING AND APPLICATIONS
2015年
9期
107-110,116
,共5页
视觉模型%量化索引调制%数字指纹%性能评价
視覺模型%量化索引調製%數字指紋%性能評價
시각모형%양화색인조제%수자지문%성능평개
perceptual model%quantization index modulation%digital fingerprinting%performance evaluation
在传统的基于QIM（Quantization Index Modulation）嵌入的数字指纹系统中，由于量化步长固定，指纹系统的抗共谋性能和图像保真度较差。针对这些问题，提出一种抗共谋指纹方案，在嵌入指纹时添加随机信号到宿主信号的DCT域，根据Watson视觉模型选择量化步长。实验结果表明，与原始的QIM指纹方案相比，采用提出方案的QIM指纹系统在抗共谋能力和视觉失真度方面都具有较好的性能。
在傳統的基于QIM（Quantization Index Modulation）嵌入的數字指紋繫統中，由于量化步長固定，指紋繫統的抗共謀性能和圖像保真度較差。針對這些問題，提齣一種抗共謀指紋方案，在嵌入指紋時添加隨機信號到宿主信號的DCT域，根據Watson視覺模型選擇量化步長。實驗結果錶明，與原始的QIM指紋方案相比，採用提齣方案的QIM指紋繫統在抗共謀能力和視覺失真度方麵都具有較好的性能。
재전통적기우QIM（Quantization Index Modulation）감입적수자지문계통중，유우양화보장고정，지문계통적항공모성능화도상보진도교차。침대저사문제，제출일충항공모지문방안，재감입지문시첨가수궤신호도숙주신호적DCT역，근거Watson시각모형선택양화보장。실험결과표명，여원시적QIM지문방안상비，채용제출방안적QIM지문계통재항공모능력화시각실진도방면도구유교호적성능。
The conventional QIM based fingerprinting system offers relatively poor collusion resistance and image fidelity because of fixed quantization step size. For these problems, an anti-collusion fingerprinting scheme is proposed. A random signal is added to the DCT domains of host signal during embedding fingerprint. Meanwhile, the quantization step size is selected on the basis of Watson’s perceptual model. Experimental results confirm the QIM fingerprinting system based on pro-posed scheme has better performance on collusion resistance and perceptual quality compared with the original QIM method.
