Recently, since the traffic is increasing every year, the problems of traffic jam and accidents, and so on, are increasing, it is required that the ITS (Intelligent Transport Systems) provides the drivers with the information for smooth and safety drive. As one of ITS (Intelligent Transport Systems) techniques, the studies on the traffic flow measurement by image processing have been proposed widely. In the conventional methods, since the traffic flow is almost observed from one viewpoint, thus one vehicle is occluded by another one. It is difficult to extract an occluded vehicle by the image processing. In our proposal method, multiple views are used in order to solve the occlusion in the image taken from one viewpoint. On the other hand, the locations of cameras are not always placed at the desirable position for the traffic flow observation system. We propose a method to extract the movement vehicles from the multiple viewpoints which are placed as freely as possible. Even if the o...