Abstract

In this paper we present a general example based framework for detecting objects in static images by components. The technique is demonstrated by developing a system that locates people in cluttered scenes. The system is structured with four distinct example based detectors that are trained to nd separately the four components of the human body: the head, legs, left arm, right arm. After ensuring that these components are present in the proper geo-metric con guration, a second example based classi er combines the results of the component detectors to classify a pattern as either a \person " or a \non-person. " We call this type of hierarchical architecture in which learning occurs at multiple stages an Adaptive Combination of Classi ers (ACC). We present results that show that this system performs signi cantly better than a similar full body person detector. This suggests that the improvement in performance is due to the component based approach and the ACC data classi cation archi-tecture. The algorithm is also more robust than the full body person detection method in that it is capable of locating partially occluded views of people and people whose body parts have little contrast with the background.

Citations