搜索结果: 1-15 共查到“工学 Level set”相关记录31条 . 查询时间(0.115 秒)
AUTOMATIC ROOFTOP EXTRACTION IN STEREO IMAGERY USING DISTANCE AND BUILDING SHAPE REGULARIZED LEVEL SET EVOLUTION
Rooftop extraction Level set DSM DTM
2017/7/12
Automatic rooftop extraction is one of the most challenging problems in remote sensing image analysis. Classical 2D image processing techniques are expensive due to the high amount of features require...
WATER EXTRACTION FROM HIGH RESOLUTION SATELLITE IMAGE BASED ON THE FAST MATCHING LEVEL SET METHOD
Fast Matching High Resolution Satellite Image Water ITK Jiawang District
2016/3/17
The overarching goal of this study was to use one of the simple level set methodologies for extracting water boundaries using high resolution satellite images. In the first part of the paper, study ar...
DATA FUSION OF MULTI-SOURCE REMOTE SENSING BASED ON LEVEL SET METHOD AND APPLICATION TO URBAN ROAD EXTRACTION
Urban Multisensor Fusion Algorithms Semi-automation Extraction
2015/12/31
Using data fusion of multi-spectral and microwave radar images, a semiautomatic method is developed based on the level set method for application to urban road extraction. The fast marching method of ...
Research on Edge Extraction with Level Set Method
Remote Sensing Image processing Edge Extraction Level Set C-V model
2015/12/16
Image edge detection or extraction is always a research hotspot in remote sensing image processing. Up to now, there are many methods have been used in this area, such as threshold segmentation, edge ...
Stochastic Motion and the Level Set Method in Semi-Automatic Building Detection
Active Contour image segmentation graph portioning watershed method weight dissimilarity
2015/12/8
Image segmentation is defined as partitioning an image into non-overlapping regions based on the intensity or texture. The active contour methods with comes from the basic ideas of Stochastic Motion a...
SEMI-AUTOMATED DETECTION OF SURFACE DEGRADATION ON BRIDGES BASED ON A LEVEL SET METHOD
Deterioration detection Monitoring Large infrastructures Level sets Image segmentation
2015/9/21
Due to the effect of climate factors, natural phenomena and human usage, buildings and infrastructures are subject of progressive degradation. The deterioration of these structures has to be monitored...
Shape Sensitivity of Free-Surface Interfaces Using a Level Set Methodology
Shape Sensitivity Free-Surface Interfaces Level Set Methodology
2015/7/3
In this paper we develop the continuous adjoint methodology to compute shape sensitivi ties in free-surface hydrodynamic design problems using the incompressible Euler equations and the level set meth...
Polynomial Level-Set Method for Attractor Estimation
Attractor Estimation Level-Set Method
2015/6/19
In this study, we present a polynomial level-set method for attractor estimation. This method uses the sub-level representation of sets. The problem of flowing these sets under the advection map of a ...
Polynomial Level-Set Method for Polynomial System Reachable Set Estimation
Polynomial System Level-Set Method
2015/6/19
In this paper, we present a polynomial level-set method for advecting a semi-algebraic set for polynomial systems. This method uses the sub-level representation of sets. The problem of flowing these s...
基于Level Set的海岸线检测
边缘检测 水平 图像处理
2017/1/16
采用海岸线做为地标进行静止卫星导航是一种重要的遥感图像自动导航方法，此方法在静止卫星遥感图像中选取特定区域，检测其中的海陆分界线，与全球海岸线标准模板库的相应区域进行匹配，依据计算获得的偏移量调整卫星姿态.根据静止卫星图像自动导航过程的特点，本文提出了一种适用于红外通道的基于水平集算法的海陆分界线检测方法，本方法依据地标模板库进行初始化，采用一种可扩展区域能量泛函推动曲线进行演化，直至收敛.实验结...
AUTOMATIC EXTRACTION OF WATER IN HIGH-RESOLUTION SAR IMAGES BASED ON MULTI-SCALE LEVEL SET METHOD AND OTSU ALGORITHM
Synthetic aperture radar (SAR) Multi-scale level set Water extraction OTSU algorithm Segmentation
2014/4/29
Water extraction has an important significance in flood disaster management and environmental monitoring. Compared to optical sensor, Synthetic aperture radar (SAR), which has the properties of high r...
An explicit finite volume element method for solving characteristic level set equation on triangular grids
Characteristic level set equation Finite volume element method Explicit method Triangular grid Twophase incompressible flow
2012/2/28
Level set methods are widely used for predicting evolutions of complex free surface topologies, such as the crystal and crack growth, bubbles and droplets deformation,spilling and breaking waves, and ...
基于Level Set方法对油水和 气水两相界面的数值模拟
Level Set方法 数值模拟 两相流
2010/12/21
为研究两相界面迁移特性，基于Level Set方法，建立了求解非定常不可压缩两相界面流动的数值方法。计算中使用结构化网格采用Level Set函数捕捉两相界面。通过对经典算例的模拟，验证了数值方法对界面捕捉的有效性和精确性。模拟了油滴在水中上升、变形，与油层融合的过程，研究了气泡在产生、发展、脱离阶段的变形机理，和表面张力系数对气泡形状的影响。计算结果发现，表面张力系数越大，气泡在发展阶段持续的时...
建立了三维粘性不可压非牛顿流体流动的控制方程，采用Level Set/Ghost/SIMPLEC方法模拟了注塑成型充模阶段的三维流动过程；追踪到了不同时刻的熔体前沿界面，预测并分析了流动过程中不同时刻的压力、速度等重要的流动特征参数，并与牛顿流体相应的流动特征参数做了对比。研究结果表明：Level Set/Ghost/SIMPLEC方法可以准确追踪非牛顿熔体前沿界面；幂律熔体在流动过程中的压差明显...
基于level set的Eulerian-Lagrangian耦合方法及其应用
大变形流体力学问题 多介质 Eulerian-Lagrangian耦合方法 水平集方法 近似Riemann解
2014/3/10
提出了一种基于水平集的Eulerian-Lagrangian耦合方法，其中Lagrangian方法采 用相容显式有限元拉氏方法，Eulerian方法采用基于近似Riemann解的有限体 积Eulerian方法，多介质界面处理采用新的水平集和Ghost方法计算. 给出了若干 数值算例，包括激波管问题以及金属和气体的运动界面及其大变形问题，并分别与 精确解和相容显式有限元拉氏方法的计算结果进行了对比....