A Visual Intelligent Outdoor Surveillance System
一种可视化智能户外监控系统

Aiming at the shortcomings of prevalent visual surveillance system, an intelligent surveillance system which can accomplish automatic detection and classification of moving objects by making use of the computer system is presented in this paper. It mainly consists of such modules as cameras, video capuring, change detection, classification, human interface, alarm log and image database etc. Because current image difference techniaue raises shcu problems as refreshing frequency of reference image and binary threshold selection problems after subtraction of pixel brightness, such comcepts as detecting block, extraction function, binary output function are introduced in this paper to resolve these problems. In addition to, there are complex scenes and lots of disturbance in outdoor environments, so some key techniques such as projection histogram of silhouette pattern, accumulation based on space\|time information and geometric model based on edge detection are presented to solve the difficulty of human body recognizing and decrease the ratio of missing alarm and false alarm.