Patent Document ID: 5504315
Application ID: 08059252
Patent Status: 1

Claim One:
1. A method of verifying a reflectivity characteristic of a target symbol when the target symbol is positioned at a substantial distance from the verifier apparatus, the target symbol being of the type including a pattern of elements having less-reflective areas and more-reflective areas, said method comprising the steps of: providing calibration information to a verifier apparatus; positioning the verifier apparatus, including a radiation emitter and a radiation detector, at a predetermined substantial distance from the location of said target symbol; directing radiation from said emitter to a plurality of points on said target symbol comprising scanning a beam of radiation across said target symbol at a variable scan rate; receiving radiation reflected from said target symbol; processing the received radiation to generate reflectivity data representing reflectivity conditions at a plurality of points on said target symbol; using the calibration information to compensate the reflectivity data to provide compensated reflectivity data, said calibration information including information for compensating for said variable scan speed; and processing the compensated reflectivity data to provide a measurement of said reflectivity characteristic.