ABSTRACT
Acknowledgment .....................................................................299 References ..............................................................................299
10.1 INTRODUCTION
Understanding human interaction is important in computer vision for a wide range of potential applications including visual surveillance, security enforcement, intelligent environments, and human-computer interaction. Human activity and interaction in the real world occur in a three-dimensional space and typically involve multiple persons or objects moving in the 3D space. In comparison, computer-visionbased understanding of human interaction deals with 2D image-based representation(s) of the persons and objects. The analysis of multiperson interaction raises diffi cult issues in computer vision: occlusion between objects and body deformation during the interaction.
