1. A method for automatically matching video streams from two cameras of a camera network, the method comprising: obtaining a video stream each video stream including images of a plurality of moving objects; calculating a time signature for each of the video streams, each time signature being indicative of a time at which an image of one of said plurality of moving objects is located at a predetermined part of the frame; calculating a temporal offset of one of the signatures relative to the other signature that, when applied to said one of the signatures, substantially maximizes a correspondence between said one of the signatures and the other signature, the temporal offset being applicable to video streams that are acquired by the two cameras to determine if a moving object that is imaged by one of the cameras is identical to a moving object that is imaged by the other of the cameras, and using the temporal offset to calculate a spatial relationship between fields of view of the two cameras, wherein calculating the spatial relationship comprises calculating a gap between the fields of view.