| 摘要 |
<p>The invention relates to a method for calibrating the position of measuring equipment mounted on a portal frame overhanging a travel lane, one of said pieces of measuring equipment being a camera (3) mounted on the portal frame in such a way that the virtual line over the travel lane, corresponding to the arrival of a vehicle into the camera's field of view, is located at a predetermined distance from the vertical of the portal frame, said distance (D) being used to pair the results of the measuring equipment. Said method is characterised in that it comprises the following steps: calculation of an estimate (formula I) of said distance (D) from the reading of the registration plate (PI) of a vehicle (Vi) on one (Ii) of the images acquired by the camera (3) during the period wherein said vehicle (Vi) crosses the field of view of the camera (3); and calculation of an average estimate (formula II) of said distance (D) by working out the average of a plurality of thus calculated estimates (formula I) of said distance (D) following the passage of a plurality of vehicles beneath the portal frame.</p> |
