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System for road sign sheeting classification

  • US 7,995,796 B2
  • Filed: 04/07/2009
  • Issued: 08/09/2011
  • Est. Priority Date: 08/12/2000
  • Status: Expired due to Term
First Claim
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1. A method for determining sheeting type of a reflective sheeting material covering a road sign comprising:

  • means for illuminating at least a portion of the reflective sheeting material covering the road sign from a plurality of distances along the roadway;

    means for collecting a plurality of light intensity measurements reflected from the at least a portion of the reflective sheeting material;

    means for generating an as-measured retroreflectivity profile using the light intensity measurements corresponding to exemplary angular displacements of incident light from a reference position;

    means for providing a database of retroreflectivity profiles with each retroreflectivity profile having an associated known sheeting type;

    means for comparing the as-measured profile to each retroreflectivity profile from the database of retroreflectivity profiles;

    means for selecting the retroreflectivity profile that best correlates to the as-measured retroreflectivity profile; and

    means for determining sheeting type of the reflective sheeting material based on the known sheeting type associated with the selected retroreflectivity profile.

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