Automatic vehicle number reader with speed measuring function

Abstract

PURPOSE: To accurately calculate the speed of a vehicle by detecting the head of the vehicle plural times by image processing and calculating the movement distance, and using data on the head of the vehicle estimated from the sizes of characters constituting a plate. CONSTITUTION: This reader is equipped with a photographing means 3 which photographs a road, vehicle head detecting means 11 - 15, a character segmenting means which segments the characters constituting the license plate from an image, and speed detecting means 16 and 17 which finds the speed of the vehicle by using the estimated height of the vehicle head and the move ment distance of the vehicle. The head of the vehicle is detected plural times by the image processing to calculate the movement distance of the head of the vehicle and the height of the head of the vehicle is estimated from the sizes of the characters which are found by the character segmenting means. Therefore, when the speed of the vehicle is calculated from the movement distance of the head of the vehicle and the time based upon the number of frames of picture planes during the period, the height data on the head of the vehicle is usable. COPYRIGHT: (C)1991,JPO&Japio

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Cited By (3)

    Publication numberPublication dateAssigneeTitle
    DE-19517026-B4December 07, 2006Robert Bosch GmbhVerfahren zur Bestimmung der Geschwindigkeit eines Fahrzeuges mit Hilfe einer das Fahrzeug aufnehmenden Videokamera und Vorrichtung zur Durchführung des Verfahrens
    JP-2006329776-ADecember 07, 2006Sumitomo Electric Ind Ltd, 住友電気工業株式会社Car position detection method, vehicle speed detection method, and device
    JP-4587038-B2November 24, 2010住友電気工業株式会社車両位置検出方法、並びに車両速度検出方法及び装置