Patent ID: 7091988

Claim:
A method of describing object region data about an object in video data including frames arranged in a frame advancing direction, the method comprising: extracting an object from each of the frames; approximating the object of each of the frames using one of predetermined figures defined by representative points; extracting the representative points of the figure for each of the frames, one of the representative points within one of the frames being a reference point represented by a coordinate value and remaining representative points within said one of the frames being represented by vectors with reference to the reference point or other of said remaining representative points; approximating a first trajectory with a first function, the first trajectory being obtained by arranging, in the frame advancing direction, position data about the coordinate value of the reference point; approximating second trajectories with second functions, each of the second trajectories being obtained by arranging, in the frame advancing direction, the vectors of the remaining representative points; and describing the object region data using the first and second functions.