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基于小波去噪的T-ray图像复原 被引量:3
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作者 吴伟 毕岗 《红外与激光工程》 EI CSCD 北大核心 2005年第5期592-596,共5页
针对实时THz脉冲(T-ray)成像系统所成图像分辨率低、受1/f相关噪声干扰严重的特点,提出一种新的基于小波去噪的T-fay图像复原算法.对T-ray图像进行离散小坡变换后,先利用广义交叉确认估计出各个分辨率层的噪声阈值,然后对每个分辨率层... 针对实时THz脉冲(T-ray)成像系统所成图像分辨率低、受1/f相关噪声干扰严重的特点,提出一种新的基于小波去噪的T-fay图像复原算法.对T-ray图像进行离散小坡变换后,先利用广义交叉确认估计出各个分辨率层的噪声阈值,然后对每个分辨率层的高频子带进行迭代去噪,最后对去噪后的T-ray图像采用Jasson-Van-Cittert算法进行复原处理以提高分辨率.实验结果表明,该方法在提高T-ray图像分辨率的同时,能显著地抑制THz成像系统的1/f相关噪声.创新之处在于以广义交叉确认作为T-ray图像中1/f噪声的估计方法,大幅度提高了图像信噪比(~5 dB),避免了噪声带来的复原算法中的不适定问题,达到较好的图像复原效果. 展开更多
关键词 t-ray图像 小波去噪 l/f噪声 广义交叉确认 图像复原
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IMPACT OF DYNAMICAL HYDRATION SHELL AROUND HA PROTEIN ON NONLINEAR CONCENTRATION DEPENDENT T-RAYS ABSORPTION
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作者 YIWEN SUN TIANFU WANG +3 位作者 SIPING CHEN JIAN ZUO ZHENWEI ZHANG CUNLIN ZHANG 《Journal of Innovative Optical Health Sciences》 SCIE EI CAS 2013年第4期77-83,共7页
T rays is sensitive to covalently cross linked proteins and can be used to probe unique dynamic properties of water surrounding a protein.In this paper,we demonstrate the unique abeorption properties of the dynamic hy... T rays is sensitive to covalently cross linked proteins and can be used to probe unique dynamic properties of water surrounding a protein.In this paper,we demonstrate the unique abeorption properties of the dynamic hydnation shells deternined by hemagglutinin(HA)protein in ter-ahertz frequency.We study the changes arising fom diferent concentrations in detail and show that nonlinear absorption coefficient is induced by the dynamic hydration water.The binary and ternary component model were used to interpret the nonlinearity absorption behaviors and predict the thickness of the hydration shells around the HA protein in aquous phase. 展开更多
关键词 t-rays absorption officient HEMAGGLUTININ hydration shell
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Terahertz PT technology for measurement of multiphase flow and its infrared simulation
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作者 张光新 陈稷 周泽魁 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2005年第12期1435-1440,共6页
Terahertz process tomography (PT) is a new technology for multiphase flow measurement. T-ray PT prototype based on analysis of the T-ray’s merits was proposed and an NIR PT simulation system was developed in this pap... Terahertz process tomography (PT) is a new technology for multiphase flow measurement. T-ray PT prototype based on analysis of the T-ray’s merits was proposed and an NIR PT simulation system was developed in this paper. The architecture, algorithm and characteristics of the simulation system were studied through experimental test. Evaluations of the simulation system performance and corresponding promotional approach were made. It was shown that the solution of simulation system could be adapted for THz PT technology, and that the experimental results proved that the simulation system itself is suitable for parameter measurement of two-phase flow. 展开更多
关键词 t-ray Near infrared Process tomography (PT) Multiphase flow
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