69 research outputs found
A Design Time Estimation Methodology for Spatial Databases
We propose a design time methodology for estimating performances of spatial databases, which includes methods for estimating disk occupancy and performances of manipulation operations on alphanumeric, vector, and raster data
Proceedings of the Workshop MDIC 2004 in Series on Software Engineering and Knowledge Engineering
Geographical Information Systems and on-line GIServices for health data sharing and management
Virtual Images for Similarity Retrieval in Image Database
We introduce the virtual image, an iconic index suited for pictorial information access in a pictorial database, and a similarity
retrieval approach based on virtual images to perform content-based retrieval. A virtual image represents the spatial information
contained in a real image in explicit form by means of a set of spatial relations. This is useful to efficiently compute the similarity
between a query and an image in the database. We also show that virtual images support real-world applications that require
translation, reflection, and/or rotation invariance of image representation
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