Claudio Pinhanez

Title	PNF Propagation and the Detection of Actions Described by Temporal Intervals
Author	Claudio Pinhanez and A. Bobick
Abstract	This paper presents a method for the representation and detection of action using Allen's temporal algebra and a time propagation algorithm based on a novel method called the PNF propagation. In this scheme, an action is represented as a collection of time intervals corresponding to its sub-actions, events, and detectable states of physical objects. The paper provides the basics of the PNF propagation which extends Allen's interval algebra into handling causal propagation of the states of temporal intervals. Some examples and results are given at the end, showing that the technique works well when there are sufficiently strong causal links from detectors to actions.
Venue	Proc. of the DARPA Image Understanding Workshop, New Orleans, Louisiana, May 1997
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