System and method for representing trajectories of moving objects for content-based indexing and retrieval of visual animated data

摘要

There is disclosed, for use in a system for detecting a movement of a selected object in a sequence of visual animated data frames, a video processing device for generating a descriptor data structure representative of a trajectory of the selected object. The video processing device comprises an image processor for identifying the selected object in the visual animated data frames and determining a trajectory of the selected object in a two dimensional (2D) or three dimensional (3D) coordinate space. The image processor generates a descriptor data structure that contains a position (usually a starting position) of the object in the coordinate space; a speed of the object in the coordinate space; and an acceleration of the object in the coordinate space.