System for automated determination of retroreflectivity of...

Details System for automated determination of retroreflectivity of... System for automated determination of retroreflectivity of...

2007-02-06

2007-02-06

Toatley, Jr., Gregory J. (Department: 2877)

Optics: measuring and testing

Of light reflection

C356S121000

Reexamination Certificate

active

11381503

ABSTRACT:
A system for the automated determination of retroreflectivity values for reflective surfaces disposed along a roadway repeatedly illuminates an area along the roadway that includes at least one reflective surface using a strobing light source. Multiple light intensity values are measured over a field of view which includes at least a portion of the area illuminated by the light source. A computer processing system is used to identifying a portion of the light intensity values associated with a reflective surface and analyze the portion of the light intensity values to determine at least one retroreflectivity value for that reflective surface.

REFERENCES:
patent: 5050327 (1991-09-01), Woltman
patent: 6048069 (2000-04-01), Nagaoka et al.

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