文献类型：期刊文献

中文题名：基于PSNR小波域量化调制水印嵌入方法的参数定量估算

英文题名：Quantitative estimation of parameters in quantization modulation watermarking method of wavelet domain based on PSNR

作者：景丽[1];张红军[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

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：33

期号：8

起止页码：2236-2239

中文期刊名：计算机应用

外文期刊名：Journal of Computer Applications

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

基金：国家自然科学基金资助项目(61202285);河南省政府决策研究课题(2012B026);河南省科技攻关计划项目(122102310301)

语种：中文

中文关键词：抖动量化调制;小波变换系数;峰值信噪比;量化步长;量化误差;量化系数

外文关键词：dither quantization modulation; wavelet transform coefficient; Peak Signal-to-Noise Ratio（PSNR）; quantization step; quantization error; quantization coefficient

摘要：量化步长是量化调制方法中的重要参量,但是目前无法定量计算。针对这个问题,以抖动量化调制方法为研究对象,以小波变换系数为量化系数,提出了基于峰值信噪比(PSNR)的量化步长定量估算方法。首先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方法,然后根据小波变换的性质推导出了量化步长、水印序列长度与PSNR之间的定量关系式。实验结果显示,量化步长取值相同时实验测得的PSNR值和定量关系式计算出的PSNR值基本一致,验证了推导的定量关系式。
Quantization step is a key parameter in quantization modulation method,but now there is no theoretical method to decide its value.To solve this problem,a quantitative estimation method of quantization step based on Peak Signal-to-Noise Ratio（PSNR） was proposed.In this method,dither quantization modulation method was chosen as research object,and wavelet coefficients were regarded as quantization coefficients.According to the distribution of quantization error,it firstly gave an estimating quantization error method based on quantization step.Then it deduced the quantitative relationship equation of quantization step,watermark sequence length and PSNR on the basis of some properties of wavelet transform.The experimental results show that PSNR values calculated through quantitative equation are in good agreement with those obtained from experiments when the values of their quantization step are the same.It demonstrates that the deduced quantitative relationship equations are accurate.