3,192 research outputs found
Content-based Video Retrieval
no abstract
Moving Object Trajectories Meta-Model And Spatio-Temporal Queries
In this paper, a general moving object trajectories framework is put forward
to allow independent applications processing trajectories data benefit from a
high level of interoperability, information sharing as well as an efficient
answer for a wide range of complex trajectory queries. Our proposed meta-model
is based on ontology and event approach, incorporates existing presentations of
trajectory and integrates new patterns like space-time path to describe
activities in geographical space-time. We introduce recursive Region of
Interest concepts and deal mobile objects trajectories with diverse
spatio-temporal sampling protocols and different sensors available that
traditional data model alone are incapable for this purpose.Comment: International Journal of Database Management Systems (IJDMS) Vol.4,
No.2, April 201
Representing, storing and mining moving objects data
Data about moving objects have been collected in huge amounts due to the proliferation of mobile devices, which
capture the position of objects over time. Studies about moving objects have been developed as a specific research area of
Geographic Information Systems. Those systems are designed to process traditional, static or slowly changing, geospatial
data. However, moving objects have inherent a dynamism that requires different approaches to data storage and analysis.
This paper presents a review of the key concepts associated to moving objects and their characteristics, as well as the
approaches proposed to store data about moving objects. For the analysis of moving objects, an overview of the existing data
mining techniques and some future guidelines are also presented
Content-based Video Retrieval by Integrating Spatio-Temporal and Stochastic Recognition of Events
As amounts of publicly available video data grow the need to query this data efficiently becomes significant. Consequently content-based retrieval of video data turns out to be a challenging and important problem. We address the specific aspect of inferring semantics automatically from raw video data. In particular, we introduce a new video data model that supports the integrated use of two different approaches for mapping low-level features to high-level concepts. Firstly, the model is extended with a rule-based approach that supports spatio-temporal formalization of high-level concepts, and then with a stochastic approach. Furthermore, results on real tennis video data are presented, demonstrating the validity of both approaches, as well us advantages of their integrated us
Um banco de dados espaço-temporal para desenvolvimento de aplicações em sistemas de informação geografica
Orientadores: Claudia M. Bauzer Medeiros, Mario A. NascimentoDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de ComputaçãoResumo: Esta dissertação discute a implementação de uma infra-estrutura extensĂvel, baseada em um sistema gerenciador de banco de dados orientado a objetos, que provĂŞ suporte ao desenvolvimento de aplicações espaço-temporais. A infra-estrutura está baseada na definição e implementação de um conjunto básico de operadores e classes orientadas a objetos, que cobrem os requisitos mĂnimos de processamento de consultas espaciais, temporais e espaço- temporais. As principais contribuições deste trabalho sĂŁo a definição dos operadores e das classes e sua implementação efetiva, validada atravĂ©s de uma aplicação piloto. Uma contribuição adicional Ă© a discussĂŁo da prĂłpria implementação, que permitiu corrigir falhas do modelo teĂłrico adotado.Abstract: This dissertation discusses the implementation of an extensible framework, which provides support for the development of spatio-temporal database applications. The infrastructure, developed on the O2 object-oriented database system, consists of a kernel set of operators and database classes, which meet the minimum requirements for the processing of spatial, temporal and spatio-temporal queries. The main contributions of this work are the specification of the kernel operators and classes and their implementation, validated through a pilot geographic application. Another contribution is fhe analysis of this implementation, which discusses problems and shortcomings of some models proposed in the literature.MestradoMestre em CiĂŞncia da Computaçã
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