Method of recognizing a moving feature in a video sequence

摘要

A moving feature is recognized in a video sequence by comparing its movement with a characteristic pattern. Possible trajectories through the video sequence are generated for an object by identifying potential matches of points in pairs of frames of the video sequence. When looking for the characteristic pattern, a number of possible trajectories are analyzed. The possible trajectories may be selected so that they are suitable for analysis. This may include selecting longer trajectories that can be easier to analyze. Thereby where the object being tracked is momentarily behind another object a continuous trajectory is generated.

主权项

1. A method of recognising a moving feature in a video sequence, said moving feature having a characteristic pattern over said video sequence, said video sequence comprising a first frame and a plurality of following frames, said method comprising
identifying points of interest in each frame of said video sequence; determining, for each frame other than said first frame, at least one point of interest that corresponds to a point of interest in the preceding frame in said video sequence; constructing a plurality of trajectories for a point of interest in said first frame, each trajectory comprising a location in said first frame and at least one of said following frames of said video sequence, said location in said first frame being the location of said point of interest in said first frame, said location in said at least one following frame being determined by sequentially considering each following frame of said sequence where at least one trajectory extends to the preceding frame and including in that trajectory the location of the point of interest that corresponds to a point of interest in the preceding frame included in the trajectory; and comparing said plurality of trajectories with said characteristic pattern.