Searching for authors named "Anthony Stefanidis" – sorted by Relevance.
19 documents found, showing 1 through 10.
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Abstract Modeling and Comparing Spatiotemporal Events
- …Spatiotemporal helixes constitute a novel method we developed for modeling changes in an object over time. Changes in both an object’s trajectory and its outline can be represented with these helixes. In addition, spatiotemporal helixes can be compared to determine whether multiple objects have unde…
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Peggy Agouris Sotiris Gyftakis Anthony Stefanidis
- …In this paper, we present a novel approach to the issue of extraction and tracking of objects in digital aerial images. The algorithms presented here are based on fuzzy systems theory, and are designed to function within an integrated geospatial environment. Such an environment comprises digital ima…
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Navigating through Hierarchical Change Propagation in Spatiotemporal Queries
- …In spatiotemporal applications, meaningful changes vary according to object type, level of detail, and nature of application. In this paper, we introduce a dynamic classification scheme and its interaction with a spatiotemporal model, to describe change propagation in spatiotemporal queries. Our cla…
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A Differential Spatiotemporal Model: Primitives And Operators
- …In this paper we present a differential change-oriented model for the storage and communication of spatiotemporal information, focusing on the development of model primitives and operators to support the aggregation of change over time, and the propagation of change across resolution. Our investigat…
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Multitemporal Geospatial Query Grouping Using Correlation Signatures
- …With recent advances in temporal and spatiotemporal databases, user demands are becoming more complex. As a result, simple queries are replaced by complex multitemporal query scenarios. In this paper we propose a novel image-based approach to temporally group together multidimensional geospatial que…
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Using A Fuzzy Supervisor For Object Extraction Within An Integrated Geospatial Environment
- …In this paper, we present a novel approach to the issue of extraction and tracking of objects in digital aerial images. The algorithms presented here are based on fuzzy systems theory, and are designed to function within an integrated geospatial environment. Such an environment comprises digital ima…
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Dynamic Node Distribution in Adaptive Snakes for Road Extraction
- …In this paper we address the issue of road extraction from digital imagery using deformable contour models (snakes). We present a novel variation of the traditional snakes solution, where additional nodes are inserted, and redundant nodes are deleted, to better describe the complexity of the extract…
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Modeling And Detecting Change In An Integrated Spatiotemporal Environment
- …Current geographic information systems tend to follow an inherently static approach to geospatial information management. Small amounts of information are typically synthesized into map-like application-specific data snapshots. This static approach leaves large amounts of information unused and offe…
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Automated Spatiotemporal Scaling For Video Generalization
- …In this paper we present a technique for the summarization and spatiotemporal scaling of video content. A Self Organizing Map (SOM) neural network can be used o acquire a rough generalization of the spatiotemporal trajectories of moving objects, in the form of few selected nodes along these traject…
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A Feature Library Approach to On-line Image Querying and Retrieval for Topographic Applications
- …In this paper we address the problem of content-based image retrieval using queries on shape and topology. We focus on the particularities of image databases encountered in typical topographic applications, and present the development of a spatial data management system that enables such queries. Th…
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