Management of Resources to Support Continuous Display ofStructured Video

Video is becoming widely used in a variety of elds such as medicine, education, entertainment and science. In science and education, for instance, it is used for visualization and interactive simulation as an integral part of virtual reality. It has been predicted that virtual reality could revolutionize the world of the scientist in the same way that the spreadsheet changed the world of the nancial planner [Wal93]. For example, the techniques of virtual reality were used to examine the positioning of the corrective optics to be installed in the Hubble Space Telescope prior to the actual shuttle mission to x the problem [Han93]. With a proliferation of video data, its e ective representation that facilitates design and implementation of algorithms to support queries becomes of paramount importance. This dissertation proposes a conceptual model for a video clip. It partitions a video clip into smaller and more manageable pieces. First we divide a video clip into an Object Space and a Name Space. The object space represents the rendering aspect of video, e.g., a collection of 3D representations of characters and backgrounds associated using temporal and spatial constraints along with rendering characteristics. The name space represents the user interpretation of video, e.g., name of characters, actions such as running, walking, etc. Next, we organize the object space into three layers: 1) components, 2) spatial and temporal relationships between components, and 3) rendering features such as light sources, view point, etc. The focus of this proposal is on the object space due to the value of its content description. We rst present the model and its bene ts for content based querying. Subsequently, we discuss the physical design of a system that realizes the proposed model and its related research topics.