![]() The grade is then reported with the details of the aperture, the light, and the angle of illumination as follows: The parameter with the lowest grade becomes the overall grade for the 2D symbol. ![]() The seven parameters are each measured, and the measurements converted into grades 4,3,2,1 or 0, with 4 being best, and 0 being a failure. ![]() Unlike linear barcode verifiers, only one image is used. This image is then analysed using a known sampling area (defined as the aperture reference) to measure seven different aspects, or parameters, of the symbol. All barcode verifiers must use a standardised lighting configuration, with light of a specified wavelength, to take an image of the barcode.
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