easuring retroreflectivity of materialsUS6212480Jan 25, 2000Apr 3, 2001Laser Technology, Inc.Apparatus and method for determining precision reflectivity of highway signs and other reflective objects utilizing an optical range finder instrumentUS6266442Oct 23, 1998Jul 24, 2001Facet Technology Corp.Method and apparatus for identifying objects depicted in a videostream* Cited by examinerNon-Patent Ci