The common goals of human vision and computer vision are to understand the world via visual information. Effective utilization of all spatial-temporal information and understanding the behaviors of interesting objects in a scene is a current focus in computer vision research. In this paper

we provide a general introduction for the basic situation

main concepts

research issues

typical techniques and developments of this area

hope to draw the attention of research community

to jointly work in it and to push forward the front of computer vision.