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排序方式: 共有112条查询结果,搜索用时 125 毫秒
1.
A satellite image adaptive restoration method was developed that avoids ringing artifacts at the image boundary and retains oriented features. The method combines periodic plus smooth image decomposition with complex wavelet packet transforms. The framework first decomposes a degraded satellite image into the sum of a "periodic component" and a "smooth component". The Bayesian method is then used to estimate the modulation transfer function degradation parameters and the noise. The periodic component is deconvoluted using complex wavelet packet transforms with the deconvolution result of the periodic component then combined with the smooth component to get the final recovered result. Tests show that this strategy effectively avoids ringing artifacts while preserving local image details (especially directional textures) without amplifying the noise. Quantitative comparisons illustrate that the results are comparable with previous methods. Another benefit is that this approach can process large satellite images with parallel processing, which is important for practical use. 相似文献
2.
实际地震资料处理中的子波是混合相位,对此提出一种改进的混合相位反褶积流程。在地震道中抽取一个标准道,利用谱模拟的方法求出地震子波的自相关;利用计算子波的自相关,设计了一个最小相位的滤波器,增加一个延迟量于自相关函数主对角线上,将最小相位滤波器分解为一个长度很短的滤波器和一个长度较长滤波器的褶积,得到一系列混和相位的子波和混和相位滤波器;将这些混和相位滤波器与原始地震道进行褶积,选出最佳的混和相位滤波器。通过理论模型与实际地震资料对比,证明混和相位反褶积优于最小相位反褶积。 相似文献
3.
为了去除图像模糊的同时,保持图像边缘等细节信息,需要对原始图像和点扩散函数进行准确的估计.在贝叶斯框架下,基于总变分模型,建立原始图像和点扩散函数的先验模型,同步估计原始图像和点扩散函数.对于总变分模型不可微分的问题,在不影响速度的前提下,用迭代重加权范数算法处理该问题.基于共轭分布理论,提出以伽马分布作为未知参数的先验模型,准确估计参数.实验表明该算法在对原始图像、点扩散函数和参数准确估计的基础上,成功地解决了模糊图像的盲去卷积问题,算法的速度和效果都得到了改进.与同类算法相比,本文提出的算法具有一定优势. 相似文献
4.
Wang Yang Author VitaeAuthor Vitae Zhang Qinyu Author VitaeAuthor Vitae 《系统工程与电子技术(英文版)》2008,19(4):688-693
A deconvolution algorithm is proposed to account for the distortions of impulse shape introduced by propagation process. By finding the best correlation of the received waveform with the multiple templates, the number of multipath components is reduced as the result of eliminating the "phantom paths", and the captured energy increases. Moreover, it needs only a single reference measurement in real measurement environment (do not need the anechoic chamber), which by far simplifies the templates acquiring procedure. 相似文献
5.
以铁的γ射线散射谱为例说明康普顿轮廓数据处理的全过程。主要包括:减本底、退卷积、标度变换、吸收修正、截面修正、多次散射修正等。 相似文献
6.
基于反褶积电法测井资料高分辨率处理方法是一种有效和常用的方法,但由于采用线性近似,不能完全还原电法测井电阻率分布。为了改善电法测井反褶积处理效果,采用基于高阶统计量的盲反褶积算法对经过电法测井处理的信号进行进一步处理,尽可能消除误差信号,实现处理效果的进一步优化。 相似文献
7.
WenJue Zhong DongHong Wang XiaoWei Xu BingYi Wang Qian Luo Satyanarayanan Senthil Kumaran ZiJian Wang 《科学通报(英文版)》2011,56(3):275-284
Phenolic compounds exist widely in the influents and effluents of sewage treatment plants (STPs) and most are un-regulated.
In this study, a gas chromatography-mass spectrometry (GC-MS) method for the simultaneous analysis of 50 phenolic compounds
in wastewater was developed. Deconvolution technology was used to identify contaminants that are covered by co-extracted materials.
A mass spectral library containing all 50 silylated phenolic compounds was first established and used for deconvolution. Twelve
typical phenolic compounds were selected to optimize the sample preparation procedures. Solid-phase extraction using a C18
cartridge coupled with an HLB cartridge was used for pre-concentration and dichloromethane was used for elution. The solutes
were derivatized and analyzed by GC-MS. The blank and matrix spike recoveries ranged from 57.46% to 136.4% and 47.87% to 114.8%,
respectively. Method detection limits ranged from 3.64 to 97.64 ng L−1. The relative standard deviations of all the recovery experiments were lower than 13.6%. The instrument limits of quantification
ranged from 0.7 to 87.7 pg. The method has been applied to analyze the influents and effluents of 5 Chinese STPs. Except for
regulated phenolic compounds (phenol and 2,4,6-trichlorophenol), three un-regulated phenolic compounds, including 2-chlorophenol,
2,5-dichlorophenol and 2,4-dichloro-3-ethyl-6-nitrophenol were identified in the effluent wastewater. The detected concentrations
of un-regulated phenolic compounds could possibly cause environmental effects, indicating that immediate attention is required
to prevent complications. 相似文献
8.
9.
乳清酸的2.5次微分示波极谱法测定 总被引:2,自引:0,他引:2
拟定了乳清酸的2.5次微分示波极谱测定新方法.结果表明在0.8 mol/L HCl介质中,乳清酸产生一灵敏的极谱还原波,峰电位Ep =-0.77 V(vs.SCE);其2.5次微分极谱峰峰电流ep″与乳清酸浓度在4.0×10-8~4.0×10-5 mol/L范围内呈良好线性关系(r=0.999 6,n=9),检测限为1.0×10-8 mol/L;13次平行测量4.0×10-7 mol/L乳清酸的峰电流,所得RSD为1.8%.该方法可直接用于测定牛奶中乳清酸的含量. 相似文献
10.
《系统工程与电子技术(英文版)》1995,(1)
OntheCirculantandAperiodicModelsofDeconvolution¥ZouMouyan&RolfUnbehauenAbstract:Thepopularlyusedcirculantmatrixmodelofdeconvo... 相似文献