Abstract:

In this paper we introduce a novel approach to classifier combination, that we term Weighted Ensemble Boosting. We apply the proposed algorithm to the problem of activity recognition in video, and compare its performance to different classifier combination methods. These include Approximate Bayesian Combination, Boosting, Feature Stacking, and the more traditional Sum and Product rules. Our proposed Weighted Ensemble Boosting algorithm combines Bayesian averaging strategy with the boosting framework, finding useful conjunctive feature combinations and achieving lower error rate than the traditional boosting algorithm. The method demonstrates a comparable level of stability with respect to the classifier selection pool. We show the performance of our technique with a set of 6 types of classifiers in the office setting detecting 7 classes of typical office activities.