文献类型：期刊文献

中文题名：基于PSNR空域量化索引调制水印参数定量估算

英文题名：Quantitative Estimation of Parameters in Quantization Indexing Modulation Watermarking Method of Spatial Domain Based on PSNR

作者：景丽[1];李淑红[1]

第一作者：景丽

机构：[1]河南财经政法大学计算机与信息工程学院郑州450002

第一机构：河南财经政法大学计算机与信息工程学院

年份：2013

卷号：40

期号：6

起止页码：128-131

中文期刊名：计算机科学

外文期刊名：Computer Science

收录：CSTPCD;;北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；

基金：国家自然科学基金项目(61202285);河南省政府决策研究项目(2012B026);河南省科技攻关项目(122102310301)资助

语种：中文

中文关键词：量化索引调制;空域;PSNR;量化步长;量化误差;量化系数

外文关键词：Quantization indexing modulation（QIM）, Spatial domain, Peak signal-to-noise ratio （PSNR）, Quantizationstep, Quantization error, Quantization coefficients

摘要：量化索引调制方法是常用的水印嵌入和信息隐藏方法,量化步长是该方法中决定嵌入深度的参量,目前往往是通过反复试验方法确定该参量的取值,因此影响水印嵌入速度。针对此问题,以抖动量化调制方法为例,根据量化误差的分布情况给出了基于量化步长的量化误差定量估算;以该定量估算为基础,以空域像素为量化系数推导出了量化步长、水印数据量与PSNR之间的定量关系式。实验结果显示,在相同情况下通过实验测得的PSNR值和定量关系式计算的PSNR值基本一致,验证了推导的定量关系式的正确性。
Quantization Indexing Modulation （QIM） method is usually used in watermarking and information hiding. Quantization step is a key parameter of quantization modulation method. Its value connects with watermark embedding degree. Now there is no theoretical method to decide its value except through experiments, and this will reduce water- mark inserting efficiency. To overcome this difficulty, a quantitative estimation method of quantization error for Dither- quantization Modulation was provided based on its distribution at first. Then based on the estimation method, selecting spatial pixels as quantization coefficients, the quantitative relationship equation of quantization step, watermark sequence length and PSNR was deduced. Experiments results show PSNR values calculated through quantitative equation are in good agreement with those obtained from experiments under equal conditions. It demonstrates that the deduced quanti- tative relationship equation is accurate.