Roger Midtstraum

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As video data is penetrating many information systems the need for database support for video data evolves. In this paper we present a generic data model that captures the structure of a video document and that provides a means for indexing a video stream. We also discuss query language features that can take advantage of the proposed model. We have(More)
Audio and video data represent streams of data with inherent temporal properties In this paper we consider a video database as a collection of partial ordered sets where temporal relationships exist between elements from the same video stream Video production introduces dependencies between di erent time coordinate systems In this paper we give a formal de(More)
VideoSTAR Video STorage And Retrieval is an experimental video database system that gives support for sharing and reuse of video and meta data In this paper we discuss the need for a user to control the de gree of meta data sharing when searching and browsing a shared video database and we propose a way of or ganising meta data to allow such functionality(More)
In traditional video archives, video data are stored on analogue video tapes while meta-data, such as textual descriptions of the contents of the video tapes, are stored and handled digitally by computers. In a fully digital video archive, both video data and meta-data are managed by computers and, thus, more powerful tools can be developed. In this paper,(More)
This paper describes the VideoSTAR experimental database system that is being designed to support video applications in sharing and reusing video data and meta data VideoSTAR provides four di erent repositories for media les virtual documents video structures and video annotations user indexes It also provides a generic video data model relating data in the(More)
Video servers are important for applications which make use of digital video. The video servers should provide better functionality than most of today’s video servers offer, – e.g., support of flexible and instant user interactions, delivery of multiple video formats and support of virtual video documents. In this paper we discuss the requirements that(More)
This paper considers image servers that has to adjust image size and image quality to the needs and capabilities of the client applications. We compare two different approaches to solve this problem. (1) Transcoding of images and (2) storing multiple versions of each image in the database. We find that, while transcoding provides great flexibility and easy(More)