迭加与量化水印嵌入方案的比较及量化参数优化  

Performance Comparison of Two Watermark Embedding Techniques and Optimization of QIM Parameters

作　　者：张新鹏[1] 王朔中[1] 张开文[1] 

机构地区：[1]上海大学通信与信息工程学院,上海200072

出　　处：《光电子．激光》2003年第8期858-861,共4页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金资助项目(60072030);上海市重点学科建设资助项目

摘　　要：分别研究了迭加法和量化法的隐蔽性和稳健性,并且提出了量化调制水印方案中的参数优化方法。对两类方法的分析比较表明,迭加法适用于在高频分量嵌入水印,而量化法适用于在低频分量嵌入水印。并以实验验证了这一结论。A parameter-optimized method based on quantination index modulation (QIM), which chooses an appropriate quantization step and an optimal length of watermark sequence leading to maximal robustness under a given embedding-induced PSNR, was presented. Imperceptibility and robustness of the two watermark embedding techniques, namely addition of PN sequence and optimized QIM, were compared. Theoretical analysis and numerical experiments show that the method of addition is suitable for watermark embedding into high frequency components, whereas the optimized QIM is more appropriate for embedding into low frequency components.

关 键 词：迭加法 量化法 量化调制 参数优化 水印嵌入 数字水印 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]