A glossary of temporal database concepts
ACM SIGMOD Record
ACM Transactions on Database Systems (TODS)
Querying ATSQL databases with temporal logic
ACM Transactions on Database Systems (TODS)
Content adaptation of multimedia delivery and indexing using MPEG-7
Proceedings of the tenth ACM international conference on Multimedia
Querying temporal databases using controlled natural language
COLING '00 Proceedings of the 18th conference on Computational linguistics - Volume 2
SQLST: a spatio-temporal data model and query language
ER'00 Proceedings of the 19th international conference on Conceptual modeling
Modeling omni-directional video
MMM'07 Proceedings of the 13th international conference on Multimedia Modeling - Volume Part I
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By using several digital video cameras with omni-directional sensors, complete views of the activities at some place can be recorded as omni-directional videos. We utilize this technique for developing the Retrax System, which provides video-based virtual space environments as part of the Digital City infrastructure. The system aims to realize applications that are not possible with conventional video database systems, such as human activities and communications on computer networks based on recorded video data. This system archives the activities at some place in the real world and provides a virtual space based on the archived data for collaboration among users, such as walking, annotating, and communication. The user interface of the system bridges the real and virtual spaces or past and current human activities. This paper describes the purpose and usage of the system, and then introduces its architecture, data models, and the query language. Because both video data and hypermedia data are essential to the system, a query mechanism dealing with both types of data is required. The proposed query language is designed as an extension of SQL and realizes flexible management of both types of data.