We describe an image based activity recognition solution which can be applied to both off-line video classification and activity prediction in frames. We propose a Pose based Discriminative Patch Model to make activity recognition and prediction on image level (only observing several frames). This model enables a general and flexible framework to add in discriminative patches and consider their mutual relations to an efficient tree structure. PDP makes contribution in two aspects: (1) PDP provides a novel solution to improve activity recognition and prediction, by utilizing pose based discriminative patches instead of pose configuration feature, and modeling the patches' mutual relations. (2) PDP is an image-based algorithm, so it can make predictions using limited frames, even a single image. PDP focuses on challenging data captured from Internet and movies, where we achieve a 6% improvement compared with state-of-the-art method on video level recognition dataset — Sub-JHMDB, and image level action recognition dataset. We also obtain good improvement on activity prediction task.
['Song Cao', 'Kan Chen', 'Ram Nevatia']
Activity recognition and prediction with pose based discriminative patch model