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1.
地图中河流的自动识别方法 总被引:2,自引:0,他引:2
一、引言地图是一种极普遍、极重要的信息资源。80年代以来,以扫描输入的纸质地图为对象的计算机识别理解问题愈来愈引起广泛重视。日本、美国等国先后研制出各具特点的系统,国内在这方面的研究也已起步。但其自动化程度都难以令人满意,实用性和通用性仍为有待进一步考虑的问题;另一方面,上述系统中采用的识别方法都是针对黑白图进行,大信息量的彩色信息未被利用,从而限制了识别理解技术的进一步发展。本文提出的方法对彩色纸质地图中河流的计算机自动识别理解问题做了有益的尝试。 相似文献
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根据彩色公路交通地图的图像特征,提出一种新颖的道路识别与提取方法。这种方法包括三个关键步骤。首先,根据区域的特征,提取出区域的灰度值;其次,根据道路的颜色和形状特征以及数字图像处理的一些方法(如对象的连通成分等),识别并提取出道路的颜色;最后,为了获得完整的道路网络,一些道路连接方法被提出。这种算法已经被应用于许多彩色公路地图图像中去提取道路网络。大量成功的实例表明这个算法是非常有效的。 相似文献
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采色地图图像中道路信息的识别和提取 总被引:3,自引:0,他引:3
本文研究对彩色地图图像中的道路识别提取的问题。讨论了基于聚类分析的一种按颜色分离地图要素的算法,并对若干影响效果的问题提出了修正和解决办法。 相似文献
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彩色城市交通地图的道路识别与提取 总被引:3,自引:0,他引:3
地图信息的识别和提取是地理信息系统的基础。研究对彩色城市交通地图中的道路信息进行识别和提取的问题。首先采用改进的模板匹配法去除地图中图例标识对于道路提取造成的干扰;然后根据地图的特征,为清除地图中的噪音,提出了一种基于颜色聚类分析的分离地图要素的算法,将各种地图要素按颜色进行归类,并根据噪声的特征结合采用有效的噪声去除算法实现对地图中道路的识别和提取,最后结果用数学形态学的方法进行优化处理,并进行试验。实验结果表明,该方法可以取得良好的道路提取效果。 相似文献
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为了适应栅格地图向矢量地图转化的需求,提出一种彩色公路地图道路自动获取的结构元素方法.该方法包括2个关键步骤:第一步自动识别所有的区域像素并且将其全部置于白色;第二步通过完全消除区域中的文字、图标等噪声来获取道路.为了说明文中方法的有效性,将其应用到一大类彩色公路地图,并通过与已有方法的对比说明了其优越性. 相似文献
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一种基于道路知识的矢量地图数据校正方法 总被引:2,自引:0,他引:2
准确完整的交通矢量地图是车辆导航、路径寻优等应用工作的良好基础.为了解决交通矢量地图的错误数据信息问题,在分析城市道路分布特点的基础上,提出了一种基于道路知识的矢量地图数据校正方法.将矢量数据信息中普遍存在的错误进行分类,通过对城市道路设计规范和城市道路相关知识的归纳,抽取出对各种类型错误的判定规则和校正算法,为矢量地图的校正提供了一种较新的思路.实验结果表明,该算法能够快速有效的检测和校正矢量地图数据信息中存在的各类问题,能够保证矢量地图拓扑的准确性和完整性. 相似文献
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首先采用模板匹配、特征抽取等方法提取城市和道路的标识,这些标识对后面的道路的提取有着重要的作用;然后根据道路的等级,在颜色基础上利用道路的特征分层提取道路图层;最后对道路进行细化,依据城市与道路,各种道路间的关系以及道路的特征建立一系列的判据,检查道路的合理性,并产生相应的策略对道路进行反馈处理,实现道路的全自动提取.实验结果表明了该方法的有效性. 相似文献
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Since maps are widely available for many areas around the globe, they provide a valuable resource to help understand other
geospatial sources such as to identify roads or to annotate buildings in imagery. To utilize the maps for understanding other
geospatial sources, one of the most valuable types of information we need from the map is the road network, because the roads
are common features used across different geospatial data sets. Specifically, the set of road intersections of the map provides
key information about the road network, which includes the location of the road junctions, the number of roads that meet at
the intersections (i.e., connectivity), and the orientations of these roads. The set of road intersections helps to identify
roads on imagery by serving as initial seed templates to locate road pixels. Moreover, a conflation system can use the road
intersections as reference features (i.e., control point set) to align the map with other geospatial sources, such as aerial
imagery or vector data. In this paper, we present a framework for automatically and accurately extracting road intersections
from raster maps. Identifying the road intersections is difficult because raster maps typically contain much information such
as roads, symbols, characters, or even contour lines. We combine a variety of image processing and graphics recognition methods
to automatically separate roads from the raster map and then extract the road intersections. The extracted information includes
a set of road intersection positions, the road connectivity, and road orientations. For the problem of road intersection extraction,
our approach achieves over 95% precision (correctness) with over 75% recall (completeness) on average on a set of 70 raster
maps from a variety of sources.
Yao-Yi Chiang is currently a Ph.D. student at the University of Southern California (USC). He received his B.S. in Information Management from National Taiwan University in 2000 and then his M.S. degree in Computer Science from the USC in December 2004. His research interests are on the automatic fusion of geographical data. He has worked extensively on the problem of automatically utilize raster maps for understanding other geospatial sources and has wrote and co-authored several papers on automatically fusing map and imagery as well as automatic map processing. Prior to his doctoral study at USC, Yao-Yi worked as a Research Scientist for Information Sciences Institute and Geosemble Technologies. Craig A. Knoblock is a Senior Project Leader at the Information Sciences Institute and a Research Professor in Computer Science at the USC. He is also the Chief Scientist for Geosemble Technologies, which is a USC spinoff company that is commercializing work on geospatial integration. He received his Ph.D. in Computer Science from Carnegie Mellon. His current research interests include information integration, automated planning, machine learning, and constraint reasoning and the application of these techniques to geospatial data integration. He is a Fellow of the American Association of Artificial Intelligence. Cyrus Shahabi is currently an Associate Professor and the Director of the Information Laboratory (InfoLAB) at the Computer Science Department and also a Research Area Director at the NSF’s Integrated Media Systems Center at the USC. He received his B.S. in Computer Engineering from Sharif University of Technology in 1989 and then his M.S. and Ph.D. degrees in Computer Science from the USC in May 1993 and August 1996, respectively. He has two books and more than hundred articles, book chapters, and conference papers in the areas of databases, geographic information system (GIS) and multimedia. Dr. Shahabi’s current research interests include Geospatial and Multidimensional Data Analysis, Peer-to-Peer Systems and Streaming Architectures. He is currently an associate editor of the IEEE Transactions on Parallel and Distributed Systems and on the editorial board of ACM Computers in Entertainment magazine. He is also a member of the steering committees of IEEE NetDB and the general co-chair of ACM GIS 2007. He serves on many conference program committees such as VLDB 2008, ACM SIGKDD 2006 to 2008, IEEE ICDE 2006 and 2008, SSTD 2005 and ACM SIGMOD 2004. Dr. Shahabi is the recipient of the 2002 National Science Foundation CAREER Award and 2003 Presidential Early Career Awards for Scientists and Engineers. In 2001, he also received an award from the Okawa Foundations. Ching-Chien Chen is the Director of Research and Development at Geosemble Technologies. He received his Ph.D. degree in Computer Science from the USC for a dissertation that presented novel approaches to automatically align road vector data, street maps and orthoimagery. His research interests are on the fusion of geographical data, such as imagery, vector data and raster maps with open source data. His current research activities include the automatic conflation of geospatial data, automatic processing of raster maps and design of GML-enabled and GIS-related web services. Dr. Chen has a number of publications on the topic of automatic conflation of geospatial data sources. 相似文献
Ching-Chien ChenEmail: |
Yao-Yi Chiang is currently a Ph.D. student at the University of Southern California (USC). He received his B.S. in Information Management from National Taiwan University in 2000 and then his M.S. degree in Computer Science from the USC in December 2004. His research interests are on the automatic fusion of geographical data. He has worked extensively on the problem of automatically utilize raster maps for understanding other geospatial sources and has wrote and co-authored several papers on automatically fusing map and imagery as well as automatic map processing. Prior to his doctoral study at USC, Yao-Yi worked as a Research Scientist for Information Sciences Institute and Geosemble Technologies. Craig A. Knoblock is a Senior Project Leader at the Information Sciences Institute and a Research Professor in Computer Science at the USC. He is also the Chief Scientist for Geosemble Technologies, which is a USC spinoff company that is commercializing work on geospatial integration. He received his Ph.D. in Computer Science from Carnegie Mellon. His current research interests include information integration, automated planning, machine learning, and constraint reasoning and the application of these techniques to geospatial data integration. He is a Fellow of the American Association of Artificial Intelligence. Cyrus Shahabi is currently an Associate Professor and the Director of the Information Laboratory (InfoLAB) at the Computer Science Department and also a Research Area Director at the NSF’s Integrated Media Systems Center at the USC. He received his B.S. in Computer Engineering from Sharif University of Technology in 1989 and then his M.S. and Ph.D. degrees in Computer Science from the USC in May 1993 and August 1996, respectively. He has two books and more than hundred articles, book chapters, and conference papers in the areas of databases, geographic information system (GIS) and multimedia. Dr. Shahabi’s current research interests include Geospatial and Multidimensional Data Analysis, Peer-to-Peer Systems and Streaming Architectures. He is currently an associate editor of the IEEE Transactions on Parallel and Distributed Systems and on the editorial board of ACM Computers in Entertainment magazine. He is also a member of the steering committees of IEEE NetDB and the general co-chair of ACM GIS 2007. He serves on many conference program committees such as VLDB 2008, ACM SIGKDD 2006 to 2008, IEEE ICDE 2006 and 2008, SSTD 2005 and ACM SIGMOD 2004. Dr. Shahabi is the recipient of the 2002 National Science Foundation CAREER Award and 2003 Presidential Early Career Awards for Scientists and Engineers. In 2001, he also received an award from the Okawa Foundations. Ching-Chien Chen is the Director of Research and Development at Geosemble Technologies. He received his Ph.D. degree in Computer Science from the USC for a dissertation that presented novel approaches to automatically align road vector data, street maps and orthoimagery. His research interests are on the fusion of geographical data, such as imagery, vector data and raster maps with open source data. His current research activities include the automatic conflation of geospatial data, automatic processing of raster maps and design of GML-enabled and GIS-related web services. Dr. Chen has a number of publications on the topic of automatic conflation of geospatial data sources. 相似文献
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针对地形图识别中的要素自动分割问题,提出了基于形态分解运算的提取算法.本算法根据形态特征的不同将地图要素进行结构分解,然后运用腐蚀、膨胀、改进的RLS变换等算子对相同特征的结构进行分类综合,最后依据要素特征组合的整体分析实现了地图上各要素的提取.同以往的算法相比,本算法运算简单,且能更好的解决地图要素的重叠及粘连问题.此算法已编程实现,实验证明效果比较理想。 相似文献
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提出了一种新的快速有效的低分辨率SAR图像自动道路提取算法。算法使用道路特征检测算子检测道路边缘,利用一系列模板进行边缘像素的标定和短线段的连接,最后使用动态规划技术进行道路曲线段的连接。使用低分辨RadarSat SAR图像进行实验,实验结果证明了该算法的有效性。 相似文献
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基于D-S证据理论的城市航拍道路提取方法 总被引:6,自引:0,他引:6
针对有复杂场景的城市航拍图像,提出了一种基于D-S证据理论的道路提取方法.首先建立道路模型;然后将图像分块,建立灰度连通集,并选取子图像中较大的灰度连通集作为候选道路段;根据道路模型从候选道路段中提取特征来定义多个概率分配函数BPAF(basic probability assignment functions),并使用Dempster合成法则对其进行合成,识别出道路段;最后将已识别出的道路段进行合并,排除错误路段,形成道路.实验结果证明了这一方法的有效性. 相似文献
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A function of image recognition is indispensable to an intelligent robot which can coexist with a human being. Furthermore,
the intelligent robot needs to understand the environment of their action range by getting information of characters and maps
on advertisements and signboards in order to move autonomously. In this research, a method to search the route from the starting
point to the destination on a guidance map, by extracting the road area on the map and revising degradation portions because
of overlapping with characters or other figures is proposed. And the validity of this method is shown by the experiment using
maps which were collected from advertisements or pamphlets. 相似文献
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快速准确掌握新增建设用地信息对城镇化监测研究具有重要意义。基于后验概率变化矢量检测的土地覆盖更新方法中,存在初始样本准确性低、后验概率变化矢量检测精度不理想的问题,结合多元变化检测方法,对基于后验概率变化矢量检测的更新方法进行改进,提出一种可应用于新增建设用地提取的自动化方法。利用两期影像多元变化检测结果提高初始训练样本的准确性,同时在迭代选择样本过程中加入该变化检测结果,改善变化检测更新和重分类过程的精度,更准确地提取新增建设用地。用两期嘉兴地区高分一号影像和前期影像土地利用/覆盖分类数据验证改进效果,并与改进前方法对比。结果表明:改进方法提取的2017年新增建设用地精度更高,提取更新后的2017年建设用地总体精度达到85%,Kappa系数0.7以上,变化检测精度比未改进前显著提高。同时该方法显著减少了迭代次数,提高了提取效率。 相似文献
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快速准确掌握新增建设用地信息对城镇化监测研究具有重要意义。基于后验概率变化矢量检测的土地覆盖更新方法中,存在初始样本准确性低、后验概率变化矢量检测精度不理想的问题,结合多元变化检测方法,对基于后验概率变化矢量检测的更新方法进行改进,提出一种可应用于新增建设用地提取的自动化方法。利用两期影像多元变化检测结果提高初始训练样本的准确性,同时在迭代选择样本过程中加入该变化检测结果,改善变化检测更新和重分类过程的精度,更准确地提取新增建设用地。用两期嘉兴地区高分一号影像和前期影像土地利用/覆盖分类数据验证改进效果,并与改进前方法对比。结果表明:改进方法提取的2017年新增建设用地精度更高,提取更新后的2017年建设用地总体精度达到85%,Kappa系数0.7以上,变化检测精度比未改进前显著提高。同时该方法显著减少了迭代次数,提高了提取效率。 相似文献