关键词: 信息技术, 面积测量, 有效平面, 单应矩阵, 客流密度

Abstract:

In video monitoring system, the population and density of passenger flow identified automatically are the key indicators of passenger security evaluation. This paper focuses on the method of monitoring area measurement to calculate the density. The method realizes the measurement of effective plane ground of monitoring area based on computer vision technology. It uses towdimensional perspective projection model and the template to calculate the homography, especially for the effectiveness analysis of the feature points picking up from the template with higher accuracy and operability. The paper provides a new way to realize the quick area measurement and calculation, especially on complex scenes. At last, method is applied to calculate the density of passenger traffic in Beijing South Railway Station and provides a way for passenger security warning.

Key words: information technology, area measurement, effective area plane, homography, passenger density