Dynamic data updating algorithm for image superresolution reconstruction     

Tan Bing  Xu Qing  Zhang Yan  Xing Shuai 《地球空间信息科学学报》2013,16(3):196-200

A dynamic data updating algorithm for image superesolution is proposed. On the basis of Delaunay triangulation and its local updating property, this algorithm can update the changed region directly under the circumstances that only a part of the source images has been changed. For its high efficiency and adaptability, this algorithm can serve as a fast algorithm for image superesolution reconstruction.  相似文献   

A vector field model to handle the displacement of multiple conflicts in building generalization     

Tinghua Ai  Xiang Zhang  Qi Zhou  Min Yang 《International journal of geographical information science》2013,27(8):1310-1331

In map generalization, the displacement operation attempts to resolve proximity conflicts to guarantee map legibility. Owing to the limited representation space, conflicts may occur between both the same and different features under different contexts. A successful displacement should settle multiple conflicts, suppress the generation of secondary conflicts after moving some objects, and preserve the distribution patterns. The effect of displacement can be understood as a force that pushes related objects away with properties of propagation and distance decay. This study borrows the idea of vector fields from physics discipline and establishes a vector field model to handle the displacement of multiple conflicts in building generalization. A scalar field is first constructed based on a Delaunay triangulation skeleton to partition the buildings being examined (e.g., a street block). Then, we build a vector field to conduct displacement measurements through the detection of conflicts from multiple sources. The direction and magnitude of the displacement force are computed based on an iso-line model of vector field. The experiment shows that this global method can settle multiple conflicts and preserve the spatial relations and important building patterns.  相似文献   

基于局部加密非结构化网格的三维电阻率法有限元数值模拟   总被引：10，自引：6，他引：4       下载免费PDF全文

任政勇  汤井田 《地球物理学报》2009,52(10):2627-2634

总结了目前常用的结构化网格及其局限性,分析了非结构化网格对复杂地质体边界的适应性和Delaunay三角化算法及其网格加密策略,提出了一种新的局部节点加密方法,实现了对复杂模型的完全非结构化四面体全自动剖分,给出了三维直流电阻率模拟中四面体网格的质量评价标准和最优指标.计算和分析表明,数值解在点电流源及附近的奇异区精度最低,网格加密策略可以有效地减少其影响,极大地提高数值解的精度.本文提出的局部节点加密策略计算量最小,对精度的改善也优于经典方法.在精度要求苛刻或模型十分复杂时,局部体积加密策略和二次单元是高精度模拟的可靠保证.  相似文献   

Computational framework for obtaining volumetric fracture intensity from 3D fracture network models using Delaunay triangulations     

《Computers and Geotechnics》2017

  相似文献   

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郭英  程鹏飞  吕洪标 《大地测量与地球动力学》2010,30(6):108-111

???????е?Delaunay ???????????????????CORS???????繹????????????CORS????????桢?????????????????????????????????????????????????????????????о???????????????????????????CORS???????????????????????????????????????????о???????μ??????????????????????????????????Ч???  相似文献   

基于Delaunay三角网井点面积加权法的油气储量计算     

王荣欣  杨毅恒  王明君 《世界地质》2009,28(4):508-512

提出了一种利用井点面积加权法对油气储量进行计算的方法, 该方法利用单井大地坐标构建平面Delaunay三角网, 计算各顶点在该三角形中的控制面积, 将其累加得到该井点在整个油气区域中的控制面积。利用单井控制面积可以对油气区域进行储量计算, 求出整个区域的油层有效厚度、平均孔隙度、平均原始含油饱和度及平均原油体积系数等数据。单井Delaunay三角网格的质量是所有网格中最好的, 能最大限度地利用原始井点资料, 使得储量计算效果达到最优。  相似文献   

带断层地震数据的Delaunay三角剖分算法     

刘少兵 《煤田地质与勘探》2008,36(6):70-72

数据网格化是三维地质建模的常用方法。断层是普遍的地质现象,带断层的海量数据三角剖分在建模中较为复杂。提出了一种简单的可以解决带断层地震数据Delaunay三角剖分的有效算法。该算法首先对数据边界进行初始Delaunay三角剖分,然后将其变尺度加密,生成较均匀三角网,最后将断层边界强行嵌入三角网,实现了三角网格化。   相似文献   

利用激光三角法进行快速车辙检测   总被引：2，自引：0，他引：2  

李清泉  雷波  毛庆洲  傅智能 《武汉大学学报(信息科学版)》2010,(3)

为了实现实时车辙测量及绘制足够密集的路面剖面线,分别设定全局和局部阈值,利用局部梯度极大值及邻域灰度进行激光线判断和提取;提出了基于Delaunay三角网的标定点网格建立及测量点的物方坐标反算方法。实验路段的检测结果表明,车辙检测仪的检测结果与人工检测结果符合得较好,可以作为路面车辙测量的可靠工具。  相似文献   

Dynamic data updating algorithm for image superresolution reconstruction     

TAN Bing XU Qing ZHANG Yan XING Shuai 《地球空间信息科学学报》2006,9(3):196-200

IntroductionI mage superresolution (SR) refers to i mageprocessing algorithms which can produce highquality ,high-resolution ( HR) i mages froma setof low quality , low-resolution ( LR) i magesthrough fully exploiting the great potentials ofcurrent i mage data , such as the multi-looked,multi-temporal , multi-platformand sequencei m-ages . Considering the additional temporal dataavailable in the i mage sequence ,i mage superres-olution can be more generally considered as aprocedure of transf…  相似文献   

多阶三角形数据结构的高阶Voronoi图算法研究     

邓曙光  郑智华  敖四芽  黄树新 《测绘科学》2019,44(7):35-39

针对大多数传统高阶Voronoi算法复杂且运行效率低下,缺乏拓扑关系与多种邻近查询以及地理空间可视化交互与分析上的问题,该文借助Delaunay三角形天然优势,首先建立了一种k阶Delaunay三角形数据结构,利用k阶Delaunay三角剖分与k阶的Voronoi图存在的间接性对偶关系,提出了一种k阶Delaunay三角形数据结构的高阶Voronoi图的算法,并通过数据实验分析与对比,结果表明:该算法易于理解,程序设计简单易行,提高了运行效率,有效支持地理空间应用与几何学与拓扑邻近查询,满足实际应用的需要。  相似文献