Suppose that while watching a sports program a user would like to see images of players moving closely together. In order to make that query, it is necessary to be able to intuitively express an object's complex motions or the spatio-temporal relations between objects. In this paper, we propose a method to query an object's complex motions captured on video by allowing the user to describe the object's trajectory with a mouse on a GUI. That is, the user can search the video intervals with mouse operations only. In order to verify the usability of our proposed method, we constructed a prototype. The prototype has four main functions. It can query video images with consideration to the object's moving speed. It can also perform a wild card query on the object's movement. By expressing each object's trajectory on a timeline or multi-canvas, it is possible to query multiple moving objects in order to define the spatio-temporal relations between objects. By projecting the trajectory of a moving object while viewing, it is possible to search the video database for similar movements.
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