discovering hot topics from geo-tagged video

ISCAS OpenIR

	discovering hot topics from geo-tagged video
	Liu Kuien; Xu Jiajie; Zhang Longfei; Ding Zhiming; Li Mingshu
	2012
发表期刊	Neurocomputing
ISSN	0925-2312
卷号	105 页码:-
摘要	As video data generated by users boom continuously, making sense of large scale data archives is considered as a critical challenge for data management. Most existing learning techniques that extract signal-level contents from video data struggle to scale due to efficiency limits. With the development of pervasive positioning techniques, discovering hot topics from multimedia data by their geographical tags has become practical: videos taken by advanced cameras are associated with GPS locations, and geo-tagged videos from YouTube can be identified by their associated GPS locations on Google Maps. It enables us to know the cultures, scenes, and human behaviors from videos based on their spatio-temporal distributions. However, meaningful topic discovery requires an efficient clustering approach, through which coherent topics can be detected according to particular geographical regions without out-of-focus effects. To handle this problem, this paper presents a filter-refinement framework to discover hot topics corresponding to geographical dense regions, and then introduces two novel metrics to refine unbounded hot regions, together with a heuristic method for setting rational thresholds on these metrics. The results of extensive experiments prove that hot topics can be efficiently discovered by our framework, and more compact topics can be achieved after using the novel metrics. © 2012 Elsevier B.V. All rights reserved.; As video data generated by users boom continuously, making sense of large scale data archives is considered as a critical challenge for data management. Most existing learning techniques that extract signal-level contents from video data struggle to scale due to efficiency limits. With the development of pervasive positioning techniques, discovering hot topics from multimedia data by their geographical tags has become practical: videos taken by advanced cameras are associated with GPS locations, and geo-tagged videos from YouTube can be identified by their associated GPS locations on Google Maps. It enables us to know the cultures, scenes, and human behaviors from videos based on their spatio-temporal distributions. However, meaningful topic discovery requires an efficient clustering approach, through which coherent topics can be detected according to particular geographical regions without out-of-focus effects. To handle this problem, this paper presents a filter-refinement framework to discover hot topics corresponding to geographical dense regions, and then introduces two novel metrics to refine unbounded hot regions, together with a heuristic method for setting rational thresholds on these metrics. The results of extensive experiments prove that hot topics can be efficiently discovered by our framework, and more compact topics can be achieved after using the novel metrics. © 2012 Elsevier B.V. All rights reserved.
收录类别	EI
关键词	Heuristic Methods Information Management Signal Processing Video Recording Websites
部门归属	(1) Institute of Software Chinese Academy of Sciences Beijing 100190 China; (2) School of Software Beijing Institute of Technology Beijing 100081 China
语种	英语
WOS记录号	WOS:000317091700012
引用统计
内容类型	期刊论文
URI标识	http://ir.iscas.ac.cn/handle/311060/15149
专题	中国科学院软件研究所
推荐引用方式 GB/T 7714	Liu Kuien,Xu Jiajie,Zhang Longfei,et al. discovering hot topics from geo-tagged video[J]. Neurocomputing,2012,105:-.
APA	Liu Kuien,Xu Jiajie,Zhang Longfei,Ding Zhiming,&Li Mingshu.(2012).discovering hot topics from geo-tagged video.Neurocomputing,105,-.
MLA	Liu Kuien,et al."discovering hot topics from geo-tagged video".Neurocomputing 105(2012):-.