1,720,993 research outputs found
A formal framework to represent spatial knowledge
No full textVisual representations are an essential element in human–computer interaction and can be conceived as a collection of graphical objects arranged in a two-dimensional space. It is quite natural to model visual representations through the qualitative relationships holding between their objects, and therefore, qualitative spatial relations are a fundamental way of representing spatial knowledge. To this aim, in this paper we present a framework of qualitative spatial relations providing a general, domain-independent approach to specify visual representations.</p
A Graphical Tool to Support Visual Information Extraction
No full textIn this paper we present the Spatial Relation Query
tool, a graphical software system for Information Extraction
based on the visual appearance of the information. The SRQ
tool is provided with a query language similar to the wellknown
SQL, which allows users to write queries based on the
visual arrangement of the information in an intuitive way. Two
applications showing the use of the tool on web pages and
geospatial data are presented
A spatial relation-based framework to perform visual information extraction
No full text"The Spatial Relation Query (SRQ) tool is a graphical software environment, supported by a SQL-like language, which enables users to perform information extraction driven by the visual appearance and the spatial arrangement of the information. The tool has been initially customised to work on specific application domains, like web pages and geospatial data. In this paper, we present the theoretical formalisation of the visual information extraction (VIE) task and accordingly the redesign of the SRQ tool, which is now a full-featured, general-purpose information extraction system. Moreover, we show a new application of the VIE framework to the analysis and visual information extraction from PDF files.
An Environment for the Design and Implementation of Visual Applications
No full textIn this paper we present Interactive Visual Application code Generator (IVAG), a tool for the automatic generation of the code and the documentation of software applications. It is specifically tailored to support prototyping and rapid development of visual applications, where the user interface is a relevant part of the application. IVAG is currently being experimented on a variety of case studies, in particular web-based applications
A General Theory of Spatial Relations to Support a Graphical Tool for Visual Information Extraction
No full textIn this paper we present a general spatial composition framework which allows one to model the graphical objects and the spatial relations of a large class of visual languages. The new formalism has been implemented within the SRQ tool, a software system for the Visual Information Extraction, enabling it to work on a. wider range of domains. In particular, in the paper we describe the application. of SRQ to geospatial data
Supporting Visual Information Extraction from Geospatial Data
No full text"The Spatial Relation Query (SRQ) tool is a graphical. software system, supported by a SQL-like query language,. that enables users to perform information extraction driven. by the visual appearance and the spatial arrangement of the. information. The tool has been initially designed to support. visual information extraction from web pages. Indeed, its former. underlying spatial relation formalism relied on the bounding. boxes of the graphical objects, which is a suitable choice for the. web domain. In this paper we present a theoretical extension of. the SRQ spatial composition framework that has been enhanced. to work directly on the contours of the graphical objects. This. allows us to apply the tool to more general contexts, such as GIS. applications.
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