Construction of speed measurement system for automobile traffic flow using video camera

为了进行汽车交通控制和信息普罗维登斯辅助安全交通，有必要对各条道路上的交通流特性进行调查。交通流特性可以用速度、车辆数等来表示。提出了一种基于摄像机的车速测量系统及其亮度分析方法。图像上的模糊首先受到关注。由于可以通过频率分析来测量图像上的模糊，因此考虑了通过使用模糊图像来测量车辆速度的可能性，但是由于部分亮度噪声，除了包含车辆速度信息的模糊分量之外，还包含车辆长度分量。在亮度域和频域分别引入两个滤波器，滤除不必要的分量。通过使用这些滤波器，可以清楚地分离车速分量和车辆长度分量。并为车辆速度测量提供了可能性。

It is necessary to survey the traffic flow characteristics on each road for the automobile traffic control and information providence to assist safety traffic. The traffic flow characteristics can be shown with speed, numbers of vehicles others. A measurement system of vehicle speed using video camera and its brightness analysis was proposed on this paper. The blur on the image was paid attention above all. Since a blur on the image can be measured by frequency analysis, the possibility to measure vehicle speed by using the blur image was considered.However because of partial brightness noise, vehicle length component are included other than the blur component including the information of vehicle speed. Two filters are introduced into the brightness domain and frequency domain to except from unnecessary components. It is possible to separate between vehicle speed component and vehicle length component clearly by using these filters. And the possibility to measure vehicle speed can be found.