With the rapid development of smart surveillance technology

more surveillance systems in public environments have switched from human based to computer. Delivery warehouse in airports is an important security area and it is very necessary to detect the inside invaders. Human detection is an important part in visual analysis and also widely used in smart surveillance systems. In accordance with the surveillance videos of airport delivery warehouse

a kind of visual feature is proposed to differentiate human body and normal luggage. Based on that feature

a real time smart surveillance system is also built to detect the invaders. This system reduces the cost of human resources and the experiment shows the missing rate of invaders detection is also reduced and the safety is increased.