Hierarchical dirichlet processes for unsupervised online multi-view action perception using temporal self-similarity features

In various real-world applications of distributed and multi-view vision systems, the ability to learn unseen actions in an online fashion is paramount, as most of the actions are not known or sufficient training data is not available at design time. We propose a novel approach which combines the unsupervised learning capabilities of Hierarchical Dirichlet Processes (HDP) with Temporal Self-Similarity Maps (SSM) representations, which have been shown to be suitable for aggregating multi-view information without further model knowledge. Furthermore, the HDP model, being almost completely data-driven, provides us with a system that works almost 'out-of-the-box'. Various experiments performed on the extensive JAR-AIBO dataset show promising results, with clustering accuracies up to 60% for a 56-class problem.