This paper presents a method for detecting the wheels of a vehicle in stereo image pairs. The method consists of two steps; geometrical transformation and circle extraction. The geometrical transformation uses the disparity values obtained from a stereo image pair to calculate the parameters of the plane containing wheels of the vehicle. By using these parameters, any elliptical wheels contained in the plane are transformed to circular ones which can be extracted by the circle extraction algorithm. The circle extraction algorithm consists of template matching and the Hough transform. In order to save computation and improve the results in the Hough transform, two constraints are employed; the neighbor-region edge connectivity and the gradient direction of each edge point. These are used to eliminate noncircular edge points. Experimental results show that these two constraints do eliminate noncircular edge points and preserve any circle embedded in edges.
Detecting the wheel pattern of a vehicle using stereo images
Erkennung der Radform von Fahrzeugen mit Hilfe von Stereobildern
Pattern Recognition ; 24 , 12 ; 1139-1151
1991
13 Seiten, 3 Quellen
Aufsatz (Zeitschrift)
Englisch
Wheel detector for detecting a wheel of a rail vehicle
Europäisches Patentamt | 2020
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