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THREE-IMAGE MATCHING FOR 3-D LINEAR OBJECT TRACKING
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作者 SHAO Juliang Clive Fraser 《Geo-Spatial Information Science》 2000年第2期13-18,40,共7页
This paper will discuss strategies for trinocular image rectification and matching for linear object tracking.It is well known that a pair of stereo images generates two epipolar images.Three overlapped images can yie... This paper will discuss strategies for trinocular image rectification and matching for linear object tracking.It is well known that a pair of stereo images generates two epipolar images.Three overlapped images can yield six epipolar images in situations where any two are required to be rectified for the purpose of image matching.In this case,the search for feature correspondences is computationally intensive and matching complexity increases.A special epipolar image rectification for three stereo images,which simplifies the image matching process,is therefore proposed.This method generates only three rectified images,with the result that the search for matching features becomes more straightforward.With the three rectified images,a particular line_segment_based correspondence strategy is suggested.The primary characteristics of the feature correspondence strategy include application of specific epipolar geometric constraints and reference to three_ray triangulation residuals in object space. 展开更多
关键词 three-image matching 3-d LINEAR OBJECT TRACKING
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Part-level 3-D object classification with improved interpretation tree
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作者 邢薇薇 刘渭滨 袁保宗 《Journal of Southeast University(English Edition)》 EI CAS 2007年第2期221-225,共5页
For classifying unknown 3-D objects into a set of predetermined object classes, a part-level object classification method based on the improved interpretation tree is presented. The part-level representation is implem... For classifying unknown 3-D objects into a set of predetermined object classes, a part-level object classification method based on the improved interpretation tree is presented. The part-level representation is implemented, which enables a more compact shape description of 3-D objects. The proposed classification method consists of two key processing stages: the improved constrained search on an interpretation tree and the following shape similarity measure computation. By the classification method, both whole match and partial match with shape similarity ranks are achieved; especially, focus match can be accomplished, where different key parts may be labeled and all the matched models containing corresponding key parts may be obtained. A series of experiments show the effectiveness of the presented 3-D object classification method. 展开更多
关键词 3-d object classification shape match similarity measure interpretation tree
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A new navigation approach of terrain contour matching based on 3-D terrain reconstruction from onboard image sequence 被引量:5
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作者 LI LiChun1,2,YU QiFeng2,SHANG Yang2,YUAN Yun2,LU HongWei3 & LIU XiaoLin4 1 Beijing Aerospace Control Center,Beijing 100094,China 2 College of Aerospace and Material Engineering,National University of Defense Technology,Changsha 410073,China +1 位作者 3 Equipment Research Institute of PLA’s Second Artillery,Beijing 100085,China 4 College of Mechatronic Engineering and Automation,National University of Defense Technology,Changsha 410073,China 《Science China(Technological Sciences)》 SCIE EI CAS 2010年第5期1176-1183,共8页
This article presents a passive navigation method of terrain contour matching by reconstructing the 3-D terrain from the image sequence(acquired by the onboard camera).To achieve automation and simultaneity of the ima... This article presents a passive navigation method of terrain contour matching by reconstructing the 3-D terrain from the image sequence(acquired by the onboard camera).To achieve automation and simultaneity of the image sequence processing for navigation,a correspondence registration method based on control points tracking is proposed which tracks the sparse control points through the whole image sequence and uses them as correspondence in the relation geometry solution.Besides,a key frame selection method based on the images overlapping ratio and intersecting angles is explored,thereafter the requirement for the camera system configuration is provided.The proposed method also includes an optimal local homography estimating algorithm according to the control points,which helps correctly predict points to be matched and their speed corresponding.Consequently,the real-time 3-D terrain of the trajectory thus reconstructed is matched with the referenced terrain map,and the result of which provides navigating information.The digital simulation experiment and the real image based experiment have verified the proposed method. 展开更多
关键词 terrain CONTOUR matching VISION-BASED NAVIGATION 3-d reconstruction control points key frame registration optimal local HOMOGRAPHY
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基于WorldView-3卫星带状影像生产地形级地理场景数据 被引量:1
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作者 刘冬枝 任毅 朱万雄 《测绘通报》 CSCD 北大核心 2023年第9期135-138,共4页
实景三维中国建设要求地方层面生产2 m格网DSM、DEM及优于0.5 m分辨率DOM的地形级地理场景数据。对WorldView-3卫星带状影像数据,采用传统的灰度匹配、特征匹配、变换域法匹配的方法,无法获得足够满足要求的连接点。本文采用基于频率相... 实景三维中国建设要求地方层面生产2 m格网DSM、DEM及优于0.5 m分辨率DOM的地形级地理场景数据。对WorldView-3卫星带状影像数据,采用传统的灰度匹配、特征匹配、变换域法匹配的方法,无法获得足够满足要求的连接点。本文采用基于频率相位匹配辅助的概率松弛控制点匹配方法进行连接点匹配,获得的满足精度要求的连接点数量多且分布均匀,后续生产的DSM、DEM及DOM地形级地理场景数据精度满足要求,为实景三维西藏察隅试点建设顺利开展提供了技术支撑。 展开更多
关键词 WorldView-3卫星带状影像 频率相位匹配 点位规划 概率松弛 地形级地理场景
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Preliminary Pointing Bias Calibration of ZY3-03 Laser Altimeter
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作者 Junfeng XIE Ren LIU +2 位作者 Yongkang MEI Wei LIU Jianping PAN 《Journal of Geodesy and Geoinformation Science》 2021年第3期91-100,共10页
ZiYuan3-03(ZY3-03)satellite was launched on July 25,2020,equipped with China’s second-generation laser altimeter for earth observation.In order to preliminarily evaluate the in-orbit performance of the ZY3-03 laser a... ZiYuan3-03(ZY3-03)satellite was launched on July 25,2020,equipped with China’s second-generation laser altimeter for earth observation.In order to preliminarily evaluate the in-orbit performance of the ZY3-03 laser altimeter,the pointing bias calibration based on terrain matching method was adopted.Three tracks of laser data were employed for the ZY3-03 laser altimeter calibration test.Three groups of pointing parameters were obtained respectively,and the mean value of pointing is considered as the optimal calibration result.After calibration,ZY3-03 laser pointing accuracy is greatly improved by the method,and its pointing accuracy is approximately 12.7 arcsec.The first-track laser data on the Black Sea surface is used to evaluate the relative elevation accuracy of ZY3-03 laser altimeter after pointing bias calibration,which is improved from 0.33 m to 0.19 m after calibration.Meanwhile,the absolute elevation accuracy of ZY3-03 laser altimeter after pointing bias calibration is evaluated by the Ground Control Points(GCPs)measured by RTK(Real-Time Kinematic),which is better than 0.5 m in the flat terrain. 展开更多
关键词 ZiYuan3-03 satellite spaceborne laser altimeter terrain matching geometric calibration accuracy assessment
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Numerical modeling of 3-D terrain effect on MT field 被引量:1
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作者 徐世浙 阮百尧 +2 位作者 周辉 陈乐寿 徐师文 《Science China Earth Sciences》 SCIE EI CAS 1997年第3期269-275,共7页
Using the boundary element method, the numerical modeling problem of three-dimensional terrain effect on magnetotelluric (MT) field is solved. This modeling technique can be run on PC in the case of adopting special n... Using the boundary element method, the numerical modeling problem of three-dimensional terrain effect on magnetotelluric (MT) field is solved. This modeling technique can be run on PC in the case of adopting special net division. The result of modeling test for 2-D terrain by this modeling technique is basically coincident with that by 2-D modeling technique, but there is a great difference between the results of 3-D and 2-D modeling for 3-D terrain. 展开更多
关键词 MT 3-d terrain NUMERICAL modeling BOUNDARY ELEMENT method
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Modeling of 3-D terrain effect on MT field using BEM
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作者 XU Shizhe, RUAN Baiyao, ZHOU Hui and CHEN Leshou1.Institute of Geology and Geophysics, Ocean University of Qingdao, Qingdao 266003, China 2. China University of Geosciences, Beijing 100083, China 《Chinese Science Bulletin》 SCIE EI CAS 1997年第9期764-767,共4页
THE modeling of 2-D terrain effect on magnetotelluric(MT)has been solved using finite ele-ment method(FEM)and boundary element method(BEM).This note uses BEM tosolve the problem.The solution of H_x- and E_x-polarizati... THE modeling of 2-D terrain effect on magnetotelluric(MT)has been solved using finite ele-ment method(FEM)and boundary element method(BEM).This note uses BEM tosolve the problem.The solution of H_x- and E_x-polarization wave can be obtained by the samemethod.Thus,this note only discusses the solution of H_x-polarization wave. 展开更多
关键词 MT 3-d terrain BOUNDARY ELEMENT method.
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基于InSAR的三维地形匹配导航技术的研究与实现 被引量:3
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作者 尹智龙 王可东 高意峰 《太赫兹科学与电子信息学报》 2016年第5期717-722,共6页
研究了一种以干涉合成孔径雷达(In SAR)信息为基础的三维地形匹配导航系统,该系统采用基于3-D Zernike矩的三维地形匹配算法,同时针对3-D Zernike矩在地形匹配中计算实时性差的问题进行了改进。为验证系统的有效性和算法性能,搭建了基于... 研究了一种以干涉合成孔径雷达(In SAR)信息为基础的三维地形匹配导航系统,该系统采用基于3-D Zernike矩的三维地形匹配算法,同时针对3-D Zernike矩在地形匹配中计算实时性差的问题进行了改进。为验证系统的有效性和算法性能,搭建了基于VC++和Open Scene Graph的三维可视化软件仿真平台。仿真结果表明,基于3-D Zernike矩的三维地形匹配算法定位精确度高,对地形的适应能力强,算法的实时性问题得到了良好解决,系统具有较高的工程实用价值。 展开更多
关键词 干涉合成孔径雷达 三维地形匹配 地形辅助导航系统 3-d ZERNIKE矩 可视化仿真
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Vision navigation for aircrafts based on 3D reconstruction from real-time image sequences 被引量:8
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作者 ZHU ZunShang SU Ang +2 位作者 LIU HaiBo SHANG Yang YU QiFeng 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2015年第7期1196-1208,共13页
In this paper,we propose a novel vision navigation method based on three-dimensional(3D)reconstruction from real-time image sequences.It adapts 3D reconstruction and terrain matching to establish the correspondence be... In this paper,we propose a novel vision navigation method based on three-dimensional(3D)reconstruction from real-time image sequences.It adapts 3D reconstruction and terrain matching to establish the correspondence between image points and3D space points and the terrain reference(by using a digital elevation map(DEM)).An adaptive weighted orthogonal iterative pose estimation method is employed to calculate the position and attitude angle of the aircraft.Synthesized and real experiments show that the proposed method is capable of providing accurate navigation parameters for a long-endurance flight without using a global positioning system or an inertial navigation system(INS).Moreover,it can be combined with an INS to achieve an improved navigation result. 展开更多
关键词 vision navigation 3D reconstruction terrain matching pose estimation
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Analysis of the factors affecting LiDAR DTM accuracy in a steep shrub area
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作者 J.Estornell L.A.Ruiz +1 位作者 B.Vela´zquez-Martı´ T.Hermosilla 《International Journal of Digital Earth》 SCIE 2011年第6期521-538,共18页
The creation of a quality Digital Terrain Model(DTM)is essential for representing and analyzing the Earth in a digital form.The continuous improvements in the acquisition and the potential of airborne Light Detection ... The creation of a quality Digital Terrain Model(DTM)is essential for representing and analyzing the Earth in a digital form.The continuous improvements in the acquisition and the potential of airborne Light Detection and Ranging(LiDAR)data are increasing the range of applications of this technique to the study of the Earth surface.The aim of this study was to determine the optimal parameters for calculating a DTM by using an iterative algorithm to select minimum elevations from LiDAR data in a steep mountain area with shrub vegetation.The parameters were:input data type,analysis window size,and height thresholds.The effects of slope,point density,and vegetation on DTM accuracy were also analyzed.The results showed that the lowest root mean square error(RMSE)was obtained with an analysis window size of 10 m,5 m,and 2.5 m,rasterized data as input data,and height thresholds equal to or greater than 1.5 m.These parameters showed a RMSE of 0.19 m.When terrain slope varied from 010%to 5060%,the RMSE increased by 0.11 m.The RMSE decreased by 0.06 m when point density was increased from 4 to 8 points/m2,and increased by 0.05 m in dense vegetation areas. 展开更多
关键词 LIDAR digital earth Digital terrain Model(DTM) FILTERING 3-d representation
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