Image analysis – Applications – Target tracking or detecting
Reexamination Certificate
2004-02-04
2009-08-18
Strege, John B (Department: 2624)
Image analysis
Applications
Target tracking or detecting
C382S104000, C340S933000, C340S937000, C348S143000, C348S148000, C348S149000
Reexamination Certificate
active
07577274
ABSTRACT:
A vehicle identification system distinguishes vehicles in reduced visibility conditions based on the characteristic projection patterns associated with vehicle headlights and their reflections. Recognizing that the appearance of reflections of headlight beams in a camera image is highly dependent upon the angle of incidence/reflection relative to the camera, whereas the appearance of the headlights in the camera image is relatively consistent, the vehicle identification system distinguishes vehicles from their reflections based on the tracks of the illumination patterns in a series of images. In a first embodiment, headlights are distinguished from reflections based on a length of the tracks. In a second embodiment, recognition zones are selected as regions in the camera image that are not likely to provide reflections from normally aligned headlight beams. Pattern-matching and motion-correlation techniques are also used to identify the track of each vehicle in prior and subsequent image frames.
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Cucchiara et al., Vehicle Detection under Day and Night Illumination, 1999, Special Session on vehicle traffic and surveillance.
Honeywell International , Inc.
Husch Blackwell Sanders Welsh & Katz
Strege John B
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