Modeling and retrieval of moving objects

This paper presents a symbolic formalism for modeling and retrieving video data via the moving objects contained in the video images. The model integr ates the representations of individual moving objects in a scene with the t ime-varying relationships between them by incorporating both the notions of object tracks and temporal sequences of PIRs (projection interval relation ships). The model is supported by a set of operations which form the basis of a moving object algebra. This algebra allows one to retrieve scenes and information from scenes by specifying both spatial and temporal properties of the objects involved. It also provides operations to create new scenes f rom existing ones. A prototype implementation is described which allows que ries to be specified either via an animation sketch or using the moving obj ect algebra.