This paper describes a computer vision system t o count moving vehicles on roads. The system operates on a road image sequence captured during a time period and computes the total number of vehicles which passed the road during the period. Vehicle counting is accomplished b y tracking vehicle movements within a tracking zone. The system consists of four image processing modules: (i) road structure extraction, (ii) uehicle detection, (iii) vehicle speed measurem.ent, and (iv) vehicle movement tracking. The system limits the search area for vehicle detection using the road structure information and adjusts the vehicle movement tracking zone based on vehicle speeds. The primary feature of the system is such efficient useof acquired knowledge about the road structure and vehicle speeds. The system was tested on a sequence of images of a road that has a medium-level trafic volume.
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