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COMPARATIVE GEOMETRICAL ACCURACY INVESTIGATIONS OF HAND-HELD 3D SCANNING SYSTEMS – AN UPDATE
3D mesh point cloud reference structured light systems VDI/VDE
2018/6/4
Hand-held 3D scanning systems are increasingly available on the market from several system manufacturers. These systems are deployed for 3D recording of objects with different size in diverse applicat...
RECONSTRUCTION OF 3D MODELS FROM POINT CLOUDS WITH HYBRID REPRESENTATION
Point Clouds Segmentation 3D Reconstruction Super-voxel Hybrid Representation
2018/6/4
The three-dimensional (3D) reconstruction of urban buildings from point clouds has long been an active topic in applications related to human activities. However, due to the structures significantly d...
3D SURVEY IN COMPLEX ARCHAEOLOGICAL ENVIRONMENTS: AN APPROACH BY TERRESTRIAL LASER SCANNING
Terrestrial Laser Scanner 3D documentation 3D Model Archaeological excavation
2018/6/4
The survey of archaeological sites by appropriate geomatics technologies is an important research topic. In particular, the 3D survey by terrestrial laser scanning has become a common practice for 3D ...
GRAPHICS-IMAGE MIXED METHOD FOR LARGE-SCALE BUILDINGS RENDERING
City 3D Graphic and Image Mixed Large-scale Scene Huge Data Urban Building
2018/6/5
Urban 3D model data is huge and unstructured, LOD and Out-of-core algorithm are usually used to reduce the amount of data that drawn in each frame to improve the rendering efficiency. When the scene i...
ROOFN3D: DEEP LEARNING TRAINING DATA FOR 3D BUILDING RECONSTRUCTION
3D Database Machine Learning 3D Building Models Classification Segmentation Reconstruction
2018/6/5
Machine learning methods have gained in importance through the latest development of artificial intelligence and computer hardware. Particularly approaches based on deep learning have shown that they ...
TRAJECTORY BASED 3D FRAGMENT TRACKING IN HYPERVELOCITY IMPACT EXPERIMENTS
Hypervelocity impact Space debris Fragmentation Particle tracking Trajectory fitting Stereo matching
2018/6/5
Collisions between space debris and satellites in Earth’s orbits are not only catastrophic to the satellite, but also create thousands of new fragments, exacerbating the space debris problem. One chal...
INTEGRATION OF THREE-DIMENSIONAL DIGITAL MODELS AND 3D GIS: THE DOCUMENTATION OF THE MEDIEVAL BURIALS OF AMITERNUM (L’AQUILA, ITALY)
3D GIS Documentation of Cultural Heritage Archaeological Heritage Digital Photogrammetry Archaeological Survey 3d modelling of archeological data
2018/6/5
This paper illustrates the results of an experimentation carried out by a multi-disciplinary research group made up of researchers from ITC-CNR of L'Aquila and of archaeologists of the University of L...
3DNOW: IMAGE-BASED 3D RECONSTRUCTION AND MODELING VIA WEB
Photogrammetry Structure-from-Motion Dense Image Matching 3D modeling Web service
2018/6/5
This paper presents a web-based 3D imaging pipeline, namely 3Dnow, that can be used by anyone without the need of installing additional software other than a browser. By uploading a set of images thro...
3D VIRTUAL CH INTERACTIVE INFORMATION SYSTEMS FOR A SMART WEB BROWSING EXPERIENCE FOR DESKTOP PCS AND MOBILE DEVICES
3D model Cultural Heritage WebGL ICT UAV Photogrammetry HTML5
2018/6/5
Recently, the diffusion of knowledge on Cultural Heritage (CH) has become an element of primary importance for its valorization. At the same time, the diffusion of surveys based on UAV Unmanned Aerial...
SATELLITE GUIDANCE AND CONTROL DURING OPERATIVE OPTOELECTRONIC IMAGERY FOR DISASTER MANAGEMENT
Spacecraft Guidance Attitude Determination Control Areal Land Surveying Disaster Management
2018/5/8
We consider problems on surveying the Earth surface during operative optoelectronic imagery for disaster management with respect to attitude guidance and control of the agile spacecraft. The land surv...
针对热障效应问题，采用流固耦合法计算了球形整流罩的瞬时温升，并对其进行了结构改进。首先，根据风洞及火箭撬实验，结合熵层涡干扰势分析，给出判别球型整流罩换热状态的临界来流雷诺数为2.7×106，并分析了Van Driest层流换热公式对大张角球面处的适用性；再以Van Driest换热系数为边界条件，利用有限元法进行球形整流罩瞬时温升计算，结果表明其温升较快，需合理轨迹规划以规避热障效应；针对高速长...
基于块稀疏的电阻抗成像算法
电阻抗层析成像 图像重建 稀疏表示 字典学习
2018/5/21
该文提出一种基于自适应块稀疏字典学习的电阻抗图像重建算法，构建了分块稀疏字典，较好地保留了重建图像的细节信息；同时，将字典学习与图像重建交替进行，并将迭代重建的中间结果作为稀疏字典的训练样本，有效提高了字典学习效果。数值仿真与实验重建结果表明，新方法对电阻抗成像系统测量噪声具有较好的鲁棒性，能准确重构电导率分布图像，特别是对突变细节的准确恢复。
激光主动成像中的BRDF特性
光主动成像 BRDF 图像分析 漫反射
2018/3/12
分析了常用的收发同路的BRDF函数模型，引入实折射率的函数描述介质特性进一步简化SUN模型，在传统的BRDF测试系统基础上，提出了一种基于图像分析的收发同路BRDF分析方法，采用激光主动成像实验系统照明目标样品板并成像，通过改变目标板与成像系统之间的夹角获得不同角度目标图像，进而利用图像灰度信息计算目标的BRDF值，最终得出BRDF曲线。针对不同材质进行了实验测量和仿真分析，结果表明：镜面反射目标...
两自由度舵-轴系统振动三维效应修正模型
两自由度系统 颤振 低质量比 实验
2019/1/3
考虑到小展弦比舵所存在的三维效应，利用附加质量系数ε和环量系数δ对经典Theodorsen两自由度运动方程进行修正，并与经典颤振实验结果进行比较，验证了修正后两自由度运动方程的适用性.质量比μ的不同会引起两自由度舵-轴系统振动V-g曲线形态的差异，故根据V-g曲线形状的不同将系统的振动分为第一类振动和第二类振动，其对应情况下可能发生的颤振为第一类颤振和第二类颤振.利用修正后的两自由度颤振理论模型分...
3D MODELLING IN THE REGISTRATION AND RESTORATION OF A MEGALITHIC TOMB
Dolmen stereoplotting Structure from Motion (SfM) incremental 3D model multitemporal 3D model (4D model)
2017/6/20
This article aims at showing some potential applications of geomatics to works in which both excavation and restoration are carried out simultaneously, so that the three-dimensional layout of the monu...