A Maximum - Likelihood Approach

This paper presents a novel framework, based on maximum likelihood, for training models to recognise simple spatial-motion events, such as those described by the verbs pick up, put down, push, pull, drop, and throw, and classifying novel observations into previously trained classes. The model that we employ does not presuppose prior recognition or tracking of 3D object pose, shape, or identity. We describe our general framework for using maximum-likelihood techniques for visual event classiication, the details of the generative model that we use to char-acterise observations as instances of event types, and the implemented computational techniques used to support training and classiication for this generative model. We conclude by illustrating the operation of our implementation on a small example.