Searching for authors named "Peggy Agouris" – sorted by Relevance.
27 documents found, showing 1 through 10.
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Learning Similarity with Fuzzy Functions of Adaptable Complexity
- …A common approach in database queries involves the multidimensional representation of objects by a set of features. These features are compared to the query representation and then combined together to produce a total similarity metric. In this paper we introduce a novel technique for similarity lea…
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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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Differential Snakes for Change Detection in Road Segments
- …Suetens et al. (1992), Gruen et al. (1995b), Gruen et al. (1997), The automation of object extraction from digital imagery has and Lukes (1998).…
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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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Visualization of Image Quality in Distributed Spatial Databases
- …Users of GIS are offered an abundance of aerial and satellite imagery in distributed spatial databases. Available datasets can cover the same area, differing only in quality attributes, such as resolution and positional accuracy. The advantage of having a bigger pool of information at hand is counte…
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