In this thesis a natural language query interface is developed for semantic and spatio-temporal
querying of MPEG-7 based domain ontologies. The underlying ontology is created by attaching
domain ontologies to the core Rhizomik MPEG-7 ontology. The user can pose concept,
complex concept (objects connected with an &ldquo / AND&rdquo / or &ldquo / OR&rdquo / connector), spatial (left, right
. . . ), temporal (before, after, at least 10 minutes before, 5 minutes after . . . ), object trajectory
and directional trajectory (east, west, southeast . . . , left, right, upwards . . . ) queries to the
system. Furthermore, the system handles the negative meaning in the user input. When the
user enters a natural language (NL) input, it is parsed with the link parser. According to query
type, the objects, attributes, spatial relation, temporal relation, trajectory relation, time filter
and time information are extracted from the parser output by using predefined rules. After the
information extraction, SPARQL queries are generated, and executed against the ontology by
using an RDF API. Results are retrieved and they are used to calculate spatial, temporal, and
trajectory relations between objects. The results satisfying the required relations are displayed
in a tabular format and user can navigate through the multimedia content.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12611816/index.pdf |
| Date | 01 May 2010 |
| Creators | Alaca Aygul, Filiz |
| Contributors | Kesim Cicekli, Nihan |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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