Filters








5,565 Hits in 4.4 sec

Scalable Visibility Color Map Construction in Spatial Databases [article]

Farhana Murtaza Choudhury, Mohammed Eunus Ali, Sarah Masud, Suman Nath, Ishat E Rabban
2013 arXiv   pre-print
In this paper, we formulate the above problem of quantifying the visibility of (from) a target object from (of) the surrounding area with a visibility color map (VCM).  ...  A VCM is essentially defined as a surface color map of the space, where each viewpoint of the space is assigned a color value that denotes the visibility measure of the target from that viewpoint.  ...  spatial database.  ... 
arXiv:1310.7297v1 fatcat:mbnitmzenzhp7na2yaokg5y55y

GeoDec: A Framework to Effectively Visualize and Query Geospatial Data for Decision-Making

Cyrus Shahabi, Farnoush Banaei-Kashani, Ali Khoshgozaran, Luciano Nocera, Songhua Xing
2015 IEEE Multimedia  
GeoDec blends a variety of techniques developed in the fields of databases, artificial intelligence, computer graphics and computer vision into an integrated three-tier architecture.  ...  verify decisions in the virtual world prior to executing the decisions in real world.  ...  ACKNOWLEDGEMENTS This research has been funded in part by NSF grants IIS-0238560 (PECASE), IIS-0534761 and CNS-0831505 (Cy-berTrust), the NSF Center for Embedded Networked Sensing (CCR-0120778) and in  ... 
doi:10.1109/mmul.2010.1 fatcat:wnqdydzxazbg3h7bd2db26jzna

Interactive image-based information visualization for aircraft trajectory analysis

C. Hurter, S. Conversy, D. Gianazza, A.C. Telea
2014 Transportation Research Part C: Emerging Technologies  
We address the scalability challenges in terms of data manipulation and open questions by presenting a set of related visual analysis methods that focus on decision-support in the ATC domain.  ...  Additional related work is introduced later in the paper in the context of specific problems. ATC systems Several interactive visual systems are well-known in the current ATC practice.  ...  As each screen pixel is individually synthesized to reflect data values, image-based techniques are more visually scalable than their glyph-based counterparts, offer an easy way to construct aggregated  ... 
doi:10.1016/j.trc.2014.03.005 fatcat:a4qgrgdcerepxlwsogwpxswkyq

Visibility Color Map for a Fixed or Moving Target in Spatial Databases [chapter]

Ishat E. Rabban, Kaysar Abdullah, Mohammed Eunus Ali, Muhammad Aamir Cheema
2015 Lecture Notes in Computer Science  
A recent approach models the visibility of a fixed target object from the surrounding area with a visibility color map (VCM ), where each point in the space is assigned a color value denoting the visibility  ...  To alleviate this limitation, in this paper, we propose a scalable, efficient and comprehensive solution to construct a VCM for a fixed target that considers the partial visibility of the target from viewpoints  ...  Acknowledgements This research is supported by the ICT ministry -Bangladesh innovation fund for the project Visibility Queries in 3D Spatial Databases.  ... 
doi:10.1007/978-3-319-22363-6_11 fatcat:6luywitrwngg5glr7xclunkq5u

Pigment Identification of Ancient Wall Paintings Based on a Visible Spectral Image

Junfeng Li, Dehong Xie, Miaoxin Li, Shiwei Liu, Chun'ao Wei
2020 Journal of Spectroscopy  
The pigment used in each superpixel is identified by searching the database in a specifically constructed feature space to find the nearest reference sample.  ...  It can extract the outline of wall paintings and limit the pigment filling area in restoration of wall paintings. 44 kinds of commonly used pigments with size variations are selected to construct a visible  ...  In addition, though researchers have constructed the spectral reference database of commonly used pigments for identification [28, 29] , these databases do not cover the visible spectral reflectance of  ... 
doi:10.1155/2020/3695801 fatcat:ayzt52gog5f35eu6t2ifdkbtde

Big Data Architecture Design for the Development of Hyper Live Map (HLM)

Sujung Moon, Muwook Pyeon, Sangwon Bae, Dorim Lee, Sangwon Han
2016 Journal of the Korean Society of Surveying Geodesy Photogrammetry and Cartography  
Big data or cloud computing can be presented as alternatives to the construction of spatial data for the effective use of large volumes of data.  ...  In this paper, the process of building HLM (Hyper Live Map) using multi-source data to acquire stereo CCTV and other various data is presented and a big data service architecture design is proposed for  ...  The important part of this process is to construct high-resolution color 3D data through image matching and geometric correction with stereo CCTV data and to construct (near) real-time spatial data using  ... 
doi:10.7848/ksgpc.2016.34.2.207 fatcat:4kwni24chfbynn3jbd7rtx2kla

Mobile 3D City Maps

Antti Nurminen
2008 IEEE Computer Graphics and Applications  
than reading." 1 In addition, maps are rendered on the fly on electronic devices, with various layers of spatial data.  ...  Color differences. Perceived color differences between adjacent buildings caused disorientation in places where the colors were considered a dominant feature. Ground.  ... 
doi:10.1109/mcg.2008.75 fatcat:45idf6czjvhojbm6hns2qwsmbm

Real-Time Visualization of Geo-Sensor Data Based on the Protocol-Coupling Symbol Construction Method

Donglai Jiao, Jintao Sun
2018 ISPRS International Journal of Geo-Information  
symbol construction process.  ...  The sensor data visualization method in supervisory control and data acquisition systems (SCADA) was introduced and applied to the construction and visualization process of map symbols.  ...  Ten proposed a framework to migrate a GIS database to a SCADA system where spatial data are converted to a scalable vector graphics (SVG) format to appear in an HMI [19] .  ... 
doi:10.3390/ijgi7120460 fatcat:ri7kqtmy6jbpnp54ifd34ee3w4

Construction and application of the 3D geo-hazard monitoring and early warning platform

Dunlong Liu, Lei He, Qian Wu, Yan Gao, Bin Liu, Shuang Liu, Han Luo
2021 Open Geosciences  
Based on the REST service architecture, this paper constructs a 3D geo-hazard monitoring and early warning platform with sound service compatibility and scalability by integrating geographical information  ...  resource-centered service architecture, abstracts data and services into resources for unified Uniform Resource Identifier access, enabling it to take full advantage of HTTP with great flexibility and scalability  ...  of geographic-related data, spatial databases accessed through spatial database engines, map data files, tile map cache files, etc. 3D geo-hazard monitoring and early warning platform  1047 (2) Geographic  ... 
doi:10.1515/geo-2020-0293 fatcat:yi4ec2egvvdq7cbzuuy5jqbln4

Recent advances and challenges of visual signal quality assessment

Ma Lin, Deng Chenwei, King Ngi Ngan, Lin Weisi
2013 China Communications  
While quality assessment is essential for testing, optimizing, benchmarking, monitoring, and inspecting related systems and services, it also plays an essential role in the design of virtually all visual  ...  In this paper, we first provide an overview of recently derived quality assessment approaches for traditional visual signals (i.e., 2D images/videos), with highlights for new trends (such as machine learning  ...  2 in Singapore under Grant No.  ... 
doi:10.1109/cc.2013.6520939 fatcat:flndyfnf4zbqbkwqnfrsxg7s2i

An XML-based Infrastructure to Enhance Collaborative Geographic Visual Analytics

Marc Kramis, Cedric Gabathuler, Sara Irina Fabrikant, Marcel Waldvogel
2009 Cartography and Geographic Information Science  
We propose a new, streamlined, two-step geographic visual analytics (GVA) workflow for efficient data storage and access based on a native web XML database called TreeTank coupled with a Scalable Vector  ...  This new storage framework promises better scalability with rapidly growing datasets available on the Internet, while also reducing data access and updating delays for collaborative GVA environments.  ...  We are grateful to Georgios Giannakaras who created a fully working case study as well as the world map figures during his master thesis at the University of Konstanz.  ... 
doi:10.1559/152304009788988305 fatcat:ngmerxijsjbhvpkqzvjdgkcw3e

Efficient Localization of Panoramic Images Using Tiled Image Descriptors

Akihiko Torii, Yafei Dong, Masatoshi Okutomi, Josef Sivic, Tomas Pajdla
2014 IPSJ Transactions on Computer Vision and Applications  
This is a challenging task because of significant changes in appearance due to viewpoint, season, occluding people or newly constructed buildings.  ...  We seek to localize a query panorama with a wide field of view given a large database of street-level geotagged imagery.  ...  The colors correspond to the Matlab "jet" color map, i.e., red indicates high similarity and blue indicates low similarity.  ... 
doi:10.2197/ipsjtcva.6.58 fatcat:yhqpth5slfap7bk5rmavfg3ctm

Overview of quality assessment for visual signals and newly emerged trends

Lin Ma, Chenwei Deng, King N. Ngan, Weisi Lin
2013 2013 IEEE International Symposium on Circuits and Systems (ISCAS2013)  
quality metrics of scalable and mobile videos, high dynamic range (HDR) images, image segmentation results, 3D images/videos, and retargeted images.  ...  Quality assessment is not only essential on its own for testing, optimizing, benchmarking, monitoring and inspecting related systems and services, but also plays an essential role in the design of virtually  ...  The work described in this paper was partially supported by a grant from the Research Grants Council of the Hong Kong SAR, China (Project CUHK 415712), and in part by the Singapore Ministry of Education  ... 
doi:10.1109/iscas.2013.6572040 dblp:conf/iscas/MaDNL13 fatcat:vqaqj2mgyfenroqueqmbyhjkd4

From Dusk Till Dawn: Modeling in the Dark

Filip Radenovic, Johannes L. Schonberger, Dinghuang Ji, Jan-Michael Frahm, Ondrej Chum, Jiri Matas
2016 2016 IEEE Conference on Computer Vision and Pattern Recognition (CVPR)  
To achieve this, we develop a cross-illumination color transfer technique. We evaluate our method on a large variety of landmarks from across Europe reconstructed from a database of 7.4M images.  ...  In addition, we propose a method to derive the appearance information for the model under the different illumination conditions, even for scene parts that are not observed under one illumination condition  ...  This approach first indexes all database images in a min-Hash table and then uses spatially verified hash collisions as cluster seeds.  ... 
doi:10.1109/cvpr.2016.592 dblp:conf/cvpr/RadenovicSJFCM16 fatcat:ipnrpl7xsfa7fdtj7vgxsgu2lq

Efficient spatial sampling of large geographical tables

Anish Das Sarma, Hongrae Lee, Hector Gonzalez, Jayant Madhavan, Alon Halevy
2012 Proceedings of the 2012 international conference on Management of Data - SIGMOD '12  
Large-scale map visualization systems play an increasingly important role in presenting geographic datasets to end users.  ...  Since these datasets can be extremely large, a map rendering system often needs to select a small fraction of the data to visualize them in a limited space.  ...  Therefore, the techniques from top-K are not applicable in our setting. Spatial data has been studied extensively in the database community as well.  ... 
doi:10.1145/2213836.2213859 dblp:conf/sigmod/SarmaLGMH12 fatcat:4kuqdcbujjgwfn72w5xn7ozkfy
« Previous Showing results 1 — 15 out of 5,565 results