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Search Results: 1 - 10 of 9366 matches for " 相干图 "
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基于小波域hmt模型insar干涉图噪声滤波研究
何 敏,何秀凤
遥感技术与研究 , 2007,
Abstract: 相干斑噪声是insar干涉图固有的,且insar干涉图对相干斑噪声十分敏感,为了得到精度更高的干涉测量产品,需要对干涉图进行相干斑噪声滤波。针对insar干涉图中相干斑噪声的统计特性,提出了一种基于小波域hmt模型的insar干涉图滤波算法,对insar干涉图的实部和虚部分别进行处理。试验研究结果表明,该方法在有效抑制相干斑的同时,还能有效地保持相位的细节信息和条纹的边缘结构,而且大大地减少了残余点的数量,有利于提高insar干涉测量的精度。
RESEARCH ON A NOVEL INDEX FOR ASSESSMENT OF INTERFEROGRAM QUALITY
一种新的干涉图质量评定指标研究

Zhao Chaoying,Zhang Qin,
赵超英
,张勤

大地测量与地球动力学 , 2009,
Abstract: Interferogram of two coregistrated master and slave images is one of the main products in the SAR interferometric processing,and the filtering of interferogram is a key step for rational unwrapping.So the quality of interferogram can not only be applied to assess the coregistration precision,but also be used to determine the filtering factor and assess the filtering effect.According to the basic principle of the method of sum of phase difference(SPD),this paper puts forward the phase difference and index wi...
PHASE UNWRAPPING WITH HYBRID PARTICLE SWARM OPTIMIZATION ALGORITHM
基于混合微粒群算法的相位解缠

Fan Hongdong,Deng Kazhong,Xue Jiqun,Zhu Chuanguang,
范洪冬
,邓喀中,薛继群,祝传广

大地测量与地球动力学 , 2010,
Abstract: 针对Goldstein枝切线及蚁群解缠方法存在的问题,提出一种基于混合微粒群算法的相位解缠方法。该算法首先对奇异点进行预处理,将其分为偶极点、边界点和内部点;然后,利用相干图对内部点分区,并采用混合微粒群算法生成各自区域内的最短路径;最后,将这些最短路径分割成电荷平衡的小段枝切线,并对边界点和剩余未连接的奇异点按照窗口扩展法生成枝切线。实验表明,该算法比传统枝切线解缠方法更加有效。
基于InSAR技术的滑坡灾害监测
王志勇,张金芝
大地测量与地球动力学 , 2013,
Abstract: ?分析InSAR技术监测滑坡灾害存在的技术难点,提出采用L波段的高分辨率PALSAR雷达数据,基于雷达干涉测量技术及多源观测数据,对滑坡地质灾害进行综合监测。以北京房山区史家营滑坡为实验区,选取2008—2010年7景ALOSPALSAR雷达数据,通过分析时空基线构建4个干涉对,分别获取了不同时段的滑坡分布及滑坡位移,并对滑坡位移及相干图进行分析。试验证明基于雷达干涉测量技术联合多源观测数据是进行滑坡地质灾害定量监测的最有效的手段之一。
利用insar技术定位西安活动地裂缝
赵超英,张勤,丁晓利,瞿伟
武汉大学学报(信息科学版) , 2009,
Abstract: ?根据活动地裂缝造成的形变去相干特征,分析了自适应滤波后的差分干涉图的伪相干图,并从中提取了所监测时间段的活动地裂缝的位置信息,将其与该时间段地面调查的地裂缝位置信息进行了比较。研究发现,采用伪相干图法不仅可以提取活动地裂缝的位置信息,还可以监测地裂缝的发育状况。通过与地裂缝水准对点资料比较发现,活动地裂缝区域可能是造成相位解缠粗差的区域。
Research on positioning of ground fissures in Xi''an during 1992~1993 based on InSAR interferometry
InSAR技术用于西安地区1992~1993年间活动地裂缝的定位研究

ZHAo Chao-ying,ZHANG Qin,DING Xiao-li,PENG Jian-bing,YANG Cheng-sheng,
赵超英
,张勤,丁晓利,彭建兵,杨成生

地球物理学进展 , 2009,
Abstract: Ground fissure in Xi'an is a typical geo-hazard with nearly half a century history. Based on the theory of deformation de-correlation of the active ground fissures, this paper mainly investigates the positioning of active ground fissures by analyzing the pseudo-coherence map of adaptively filtered differential interferogram. We take two ERS SAR data during 1992-1993 to investigate the active fissures position during this period. And high correlation can be achieved by comparing with the engineering geological investigation results. The leveling data are applied to demonstrate the phase unwrapping errors in the active fissure regions. Therefore special considerations should be taken for discontinuous deformation monitoring in the active fissure region by applying differential InSAR techniques later on.
急性中心性浆液性脉络膜视网膜病变黄斑区形态学改变与视功能的关系
路露,徐延山,李岩,亢雷,谢士勇
天津医药 , 2011,
Abstract: ?目的:探讨急性中心性浆液性脉络膜视网膜病变(csc)的形态学改变与视功能变化的相关性。方法:选取急性csc患者36例(36只眼)应用光学相干断层扫描(oct)和多焦视网膜电图(mferg)检测黄斑区形态学改变与视功能变化,探讨急性csc的黄斑区形态学改变与视功能变化的相关性。结果:急性csc患者黄斑区神经上皮层脱离高度与最佳矫正视力(bcva)呈负相关(r=-0.922,p=0.000),神经上皮层脱离水平范围与bcva成负相关(r=-0.896,p=0.000),黄斑体积与bcva无相关(r=0.014,p=0.935)。急性csc患者的mfergp1波1~3环,n1波2环的潜伏期与bcva呈负相关(rs=-0.488,p=0.003;rs=-0.514,p=0.001;rs=-0.452,p=0.006;rs=-0.445,p=0.007)n1波1、2环的反应密度与bcva呈负相关(rs=-0.497,p=0.002;rs=-0.502,p=0.002),n1波2环、p1波1环的潜伏期与神经上皮层脱离高度呈正相关(rs=0.486,p=0.003;rs=0.421,p=0.011)。结论:oct和mferg联合应用可准确检测csc患者的黄斑区形态和功能的变化,csc患者神经上皮层脱离的高度与黄斑区功能的变化关系密切。
基于视频粒子流和ftle场的人群运动分割算法
童超,章东平,陈非予
计算机应用 , 2012,
Abstract: ?针对复杂视频监控场景中不同运动行为的人群分割,提出了将视频粒子流和有限时间李雅普诺夫指数(ftle)场相结合的人群运动分割算法。首先利用视频粒子流来表示长周期的粒子运动估计,通过最小化包含粒子外观匹配一致性和粒子间形变的能量函数,来优化每个粒子的轨迹;接着求解粒子流图的空间梯度,并构造ftle场;最后利用ftle场中的拉格朗日相干结构把流图分割成运动特性不同的区域。实验结构表明,算法能从拥挤复杂的视频监控场景中有效地分割出不同运动特性的群体,且具有较好的鲁棒性。
加窗傅里叶滤波和相干增强扩散在条纹去噪中的比较分析
Comparison of Windowed Fourier Filtering and Coherence Enhancing Diffusion for Fringe Pattern Denoising

王海霞,彭柔,钱克矛
- , 2017, DOI: 10.7520/1001-4888-17-301
Abstract: 光学干涉测量具有非接触、高精度和全场测量的优点,能对形变、折射率、位移等信息进行测量。噪声滤除是光学干涉测量产生的条纹图像处理的一个关键问题。加窗傅里叶滤波(Windowed Fourier Filtering, WFF)与自适应加窗傅里叶滤波(Adaptive Windowed Fourier Filtering,AWFF)是有效的频域去噪算法。相干增强扩散(Coherence Enhancing Diffusion, CED)则是基于偏微分方程的空域去噪算法。针对条纹去噪问题,比较了WFF、 AWFF和CED在不同密度和不同噪声类型的条纹图上的表现,分析了它们的适用条纹类型。
Optical interferometry has the advantages of non-contact, high accuracy and full field measurement. Fringe patterns produced by various optical interferometric techniques encode the information of deformation, refractive index, vibration, etc. Noise is one of the key problems affecting fringe pattern processing. Windowed Fourier filtering (WFF) and adaptive windowed Fourier filtering (AWFF) are effective frequency domain denoising methods. Coherence enhancing diffusion (CED) is a spatial domain denoising method based on partial differential equation (PDE). In this paper, the performances of WFF, AWFF and CED are compared by applying them to fringe patterns with different frequencies and different noise types. Applicable types of fringe pattern for WFF, AWFF and CED are identified respectively
A REDUCED-STATE TRELLIS FOR FULL RESPONSE CPM
全响应CPM的减少状态格状图

Li Bin,Cheng Shixin,
李斌
,程时昕

电子与信息学报 , 1996,
Abstract: The error performance of continuous phase modulation (CPM) with optimal coherent detection depends on the minimum squared Euclidean distance (MSED). In this paper, a reduced-state trellis for full response CPM is presented under the condition that the MSED is not reduced, and therefore the complexity of the Viterbi decoding is reduced.
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