Clustering analysis.

<p>Each dot represents a video segment. Distance between dots is computed by the alignment algorithm either on coordinates (i.e. trajectories) or body parts (i.e. actions). In this example, the system created three clusters (green, blue and red clouds) where the centroid (black cross) is the most representative sequence of the cluster. The more the sequences are close together the more the alignment produces a high similarity score. Sequences distant from the centroid are less similar than the computed action prototype.