I. Introduction
In present scenario, video surveillance has an important role in security purpose at various locations like airport, railway stations, shopping malls and restricted zones. The requirement to monitor more persons, places, and things along with a desire to extract out more and more useful information from video data sets is motivating latest demands for capabilities, scalability and capacity. There are immediate requirements for fully automated video surveillance systems in law enforcement, commercial and defence applications. These systems will help in assisting the human operators.