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Location-Based Top-k Term Querying over Sliding Window [chapter]

Ying Xu, Lisi Chen, Bin Yao, Shuo Shang, Shunzhi Zhu, Kai Zheng, Fang Li
2017 Lecture Notes in Computer Science  
In this paper, we present novel indexing, updating, and query processing techniques that are capable of discovering top-k locally popular nearby terms over a sliding window.  ...  Specifically, given a query location and a set of geo-tagged messages within a sliding window, we study the problem of searching for the top-k terms by considering both the term frequency and the proximities  ...  Index Updating over Sliding Window Different from the region-based term query [31] , the location of LkTQ is a point instead of a specified spatial region.  ... 
doi:10.1007/978-3-319-68783-4_21 fatcat:yqjiux3uevclbex7wkpgebwg2m

Tornado

Ahmed R. Mahmood, Saleh Basalamah, Ahmed M. Aly, Thamir Qadah, El Kindi Rezig, Anas Daghistani, Amgad Madkour, Ahmed S. Abdelhamid, Mohamed S. Hassan, Walid G. Aref
2015 Proceedings of the VLDB Endowment  
The indexing layer is adaptive, i.e., dynamically re-distributes the processing across the system according to changes in the data distribution and/or query workload.  ...  ., Spark and Storm) are not optimized for spatial/textual content. In this demonstration, we introduce Tornado, a distributed in-memory spatio-textual stream processing server that extends Storm.  ...  Tornado is able to efficiently maintain limited histories (i.e., sliding windows) of spatio-textual trajectories, e.g., trajectories of moving objects for the past one day, three hours, etc [10] .  ... 
doi:10.14778/2824032.2824126 fatcat:adjma2ee2neuhfalxcyxrcnlsa

Query Processing Techniques for Big Spatial-Keyword Data

Ahmed Mahmood, Walid G. Aref
2017 Proceedings of the 2017 ACM International Conference on Management of Data - SIGMOD '17  
Finally, we conclude this tutorial with a discussion on some of the open problems and research directions in the area of big spatial-keyword query processing.  ...  We describe the main models for big spatialkeyword processing, and list the popular spatial-keyword queries.  ...  This routing can be based on the spatial or textual properties of the incoming data.  ... 
doi:10.1145/3035918.3054773 dblp:conf/sigmod/MahmoodA17 fatcat:h444z7zuazayhcjc2syjygz6mu

Image Retrieval Using Textual Cues

Anand Mishra, Karteek Alahari, C.V. Jawahar
2013 2013 IEEE International Conference on Computer Vision  
We present an approach for the text-to-image retrieval problem based on textual content present in images.  ...  We take a query-driven search approach, where we find approximate locations of characters in the text query, and then impose spatial constraints to generate a ranked list of images in the database.  ...  Anand Mishra is supported by the Microsoft Research India PhD fellowship 2012 award. Karteek Alahari is partly supported by the Quaero programme funded by the OSEO.  ... 
doi:10.1109/iccv.2013.378 dblp:conf/iccv/MishraAJ13 fatcat:6s7zqytponedpelwvexfh5yfaq

Selectivity estimation on streaming spatio-textual data using local correlations

Xiaoyang Wang, Ying Zhang, Wenjie Zhang, Xuemin Lin, Wei Wang
2014 Proceedings of the VLDB Endowment  
keyword query on objects seen so far, where a spatial keyword query consists of a search region and a set of query keywords.  ...  Inspired by two key observations on the "locality" of the correlations among query keywords, we propose a local correlation based method by utilizing an augmented adaptive space partition tree (A 2 SP  ...  Extension Evaluation Finally, we evaluate the performance of three algorithms on sliding window model as well as boolean spatial keyword queries. Sliding Window Model.  ... 
doi:10.14778/2735471.2735472 fatcat:rtllw6m6znaopewmw2fmpq4cwm

Ottoman archives explorer

Ismet Zeki Yalniz, Ismail Sengor Altingovde, Uvgur Güdükbay, Özgür Ulusoy
2009 ACM Journal on Computing and Cultural Heritage  
In particular, sliding-window and histogram segmentation methods are coupled with recognition approaches using spatial features, neural networks, and a graph-based model.  ...  The prototype system provides CBR of document images using both example-based queries and a virtual keyboard to construct query words.  ...  -Our experiments reveal that a sliding-window-based segmentation approach usually outperforms a histogram-based one in terms of recognition effectiveness.  ... 
doi:10.1145/1658346.1658348 fatcat:kihwabab25b4lhajjoj2bwqqcq

A Survey of Content-Based Video Retrieval

P. Geetha, Vasumathi Narayanan
2008 Journal of Computer Science  
This work has done in an aim to assist the upcoming researchers in the field of video retrieval, to know about the techniques and methods available for video retrieval.  ...  The major themes covered by the study include shot segmentation, key frame extraction, feature extraction, clustering, indexing and video retrieval-by similarity, probabilistic, transformational, refinement  ...  Shot change detection based on sliding window method: Li and Lee [15] , describe a technique for shot change detection based on sliding window method.  ... 
doi:10.3844/jcssp.2008.474.486 fatcat:ntongqzelvdbtanlz4tuerzreq

Janus - Multi Source Event Detection and Collection System for Effective Surveillance of Criminal Activity

Cyrus Shahabi, Seon Ho Kim, Luciano Nocera, Giorgos Constantinou, Ying Lu, Yinghao Cai, Gerard Medioni, Ramakant Nevatia, Farnoush Banaei-Kashani
2014 Journal of Information Processing Systems  
In this paper, we present a system that enables multi-modal data collection at scale and automates the detection of events of interest for the surveillance and reconnaissance of criminal activity.  ...  Recent technological advances provide the opportunity to use large amounts of multimedia data from a multitude of sensors with different modalities (e.g., video, text) for the detection and characterization  ...  However, there has been little research on utilizing such metadata for the systematic indexing and search of video data.  ... 
doi:10.3745/jips.2014.10.1.001 fatcat:jpskak5sdvft5hgkmrwrv5geaa

An Insight to Data Stream Mining and other Emerging Learning Algorithms

Shravan Vishwanathan, Thirunavukkarasu K
2014 IOSR Journal of Computer Engineering  
We project our insight on the working of these algorithms and elicit possible loopholes and limitations.  ...  A combination of algorithms has to work cohesively in order for the system to yield accurate and timely results according to user specifications.  ...  Adaptive window is a dynamic model that can adjust the size of the window based on incoming data and the user specified confidence value.  ... 
doi:10.9790/0661-16321924 fatcat:ig24i2is25habliv2kxnht3oeq

Content-Based Retrieval of Historical Ottoman Documents Stored as Textual Images

E. Saykol, A.K. Sinop, U. Gudukbay, O. Ulusoy, A.E. Cetin
2004 IEEE Transactions on Image Processing  
The features in wavelet and spatial domain based on angular and distance span of shapes are used to extract the symbols.  ...  The queries are processed on the codebook of documents and the query images are identified in the resulting documents using the pointers in textual images.  ...  Fig. 3 . 3 Scale-invariant symbol extraction process can detect the symbol on the left within the symbol on the right, which cannot be detected by the ordinary pixel-wise sliding window symbol extraction  ... 
doi:10.1109/tip.2003.821114 pmid:15376924 fatcat:bogdfplm4bcszazopxclet4yhi

Search Techniques for the Web of Things: A Taxonomy and Survey

Yuchao Zhou, Suparna De, Wei Wang, Klaus Moessner
2016 Sensors  
A notable research direction is on device and service discovery on the IoT. A number of EU research initiatives have focussed on developing device and service resolution frameworks for the IoT.  ...  All of these characteristics indicate that traditional search techniques built on relatively static indexing structures are not sufficient for WoT applications.  ...  For more detailed discussion on these two layers please refer to [16] .  ... 
doi:10.3390/s16050600 pmid:27128918 pmcid:PMC4883291 fatcat:z3bigpprj5ho3jespbwib6fjju

Video browsing interfaces and applications: a review

Klaus Schoeffmann
2010 Journal of Photonics for Energy  
This paper presents a comprehensive review of the state of the art on video browsing and retrieval systems, with special emphasis on interfaces and applications.  ...  For each category, we present a summary of existing work, highlighting the technical aspects of each solution, and comparing them against each other.  ...  Content (TOC) feature is a list of textual entries (e.g. for "classroom" videos, generated from the corresponding slides). • A visual index containing keyframes of all the shots. • Jump backward or jump  ... 
doi:10.1117/6.0000005 fatcat:xeanz3f6pnaizmtno4mumffhoq

An efficient query indexing mechanism for filtering geo-textual data

Lisi Chen, Gao Cong, Xin Cao
2013 Proceedings of the 2013 international conference on Management of data - SIGMOD '13  
We also propose algorithms for matching the queries with incoming geotextual objects based on the index.  ...  In this paper, for the first time we study the problem of matching a stream of incoming Boolean Range Continuous queries over a stream of incoming geo-textual objects in real time.  ...  Second, it is of interest to develop solutions for storing and indexing the stream of geo-textual objects within a sliding window so that historical geo-textual objects in the sliding window can be retrieved  ... 
doi:10.1145/2463676.2465328 dblp:conf/sigmod/ChenCC13 fatcat:xwivvlabw5hthfsil7hautlxem

Searching for Classes of Visual Content in Electronic Lectures

Peter Ziewer, Martin Ebner, Christian Safran, Wolfgang Slany
2007 Ninth IEEE International Symposium on Multimedia Workshops (ISMW 2007)  
We introduce a classification scheme using characteristic parameters based on the analysis of color histograms of the recorded screens.  ...  Lecture recording allows the creation of electronic learning material for local and distance education.  ...  For this research we have computed the color histograms of over 15,000 index screenshots of 361 recorded lectures.  ... 
doi:10.1109/ismw.2007.4475998 fatcat:judhvmmlw5eslbrw5tjopccwsi

Searching for Classes of Visual Content in Electronic Lectures

Peter Ziewer, Martin Ebner, Christian Safran, Wolfgang Slany
2007 Ninth IEEE International Symposium on Multimedia Workshops (ISMW 2007)  
We introduce a classification scheme using characteristic parameters based on the analysis of color histograms of the recorded screens.  ...  Lecture recording allows the creation of electronic learning material for local and distance education.  ...  For this research we have computed the color histograms of over 15,000 index screenshots of 361 recorded lectures.  ... 
doi:10.1109/ism.workshops.2007.69 fatcat:r7lzxedycff3tk2xcz66wqkqaq
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