METHOD FOR DETERMINING THE SPEED OF A VEHICLE

摘要

The invention relates to control and measuring technology and can be used for controlling road traffic, and for controlling an infringement of the speed conditions by vehicles (V) moving in a dense flow, with a measured speed value being unambiguously assigned to the vehicles. According to the proposed method, still-frame images depicting a State licence plate number (SLPN) of a vehicle are registered during movement of said vehicle in the control zone of a video camera, and video camera location parameters relative to the road plane are additionally measured. The coordinates of corner and centre points of the SLPN are measured in the system of coordinates of the still-frame image at the beginning and at the end of the control zone and a direction of movement of the SLPN in the system of coordinates of the road is determined in accordance with the centre points of the SLPN at the beginning and at the end of the control zone. Furthermore, the magnitude of the movement of the centre point of the SLPN in a plane which is parallel to the road plane and is arranged at the height of movement of the centre point of the SLPN is determined. The speed of the vehicle is determined in accordance with the above-mentioned movement magnitude and the time taken to complete said movement. The method makes it possible to simplify and reduce the cost of a system for realizing said method since only one type of apparatus - a video camera - is required both for recognizing the number and for measuring the speed of the vehicle.